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  5. Operator's Manual

L-Acoustics dV-DOSC Operator's Manual

Summary of dV-DOSC

  • Page 1

    Version 2.0 november 2001 dv-dosc dv-sub operator manual.

  • Page 3

    Dv-dosc dv-sub manual v2.0 nov 2001 3 foreword this manual is intended for sound engineers who are responsible for the set-up, operation and maintenance of l-acoustics ® dv-dosc™ systems. It is also intended to provide interested sound designers, consultants and installers with the information they ...

  • Page 4

    Dv-dosc dv-sub manual v2.0 nov 2001 4 table of contents 0. Introduction...............................................................................................................................................8 0.1 wavefront sculpture technology™ fundamentals ......................................

  • Page 5

    Dv-dosc dv-sub manual v2.0 nov 2001 5 simulating dv-dosc downfill ..........................................................................................................58 simulating dv-dosc upfill ......................................................................................................

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    Dv-dosc dv-sub manual v2.0 nov 2001 6 6. Specifications..........................................................................................................................................124 6.1 dv-dosc element specifications .......................................................................

  • Page 7

    Dv-dosc dv-sub manual v2.0 nov 2001 7 table 3: power handling versus hp filter characteristics for dv-dosc lf ................................... 31 table 4: load, rms and peak power ratings for dv-dosc........................................................... 31 table 5: recommended amplifier powe...

  • Page 8

    Dv-dosc dv-sub manual v2.0 nov 2001 8 0. Introduction the small ''d'' in dv-dosc refers to the mathematical terminology for the derivative function since dv-dosc is a derivative of v-dosc. Dv-dosc provides the same benefits of wavefront sculpture technology as v-dosc except in a much smaller format....

  • Page 9

    Dv-dosc dv-sub manual v2.0 nov 2001 9 figure 1: wavefield interference for a conventional sound reinforcement system compared to a sculptured dv-dosc wavefield wavefront sculpture principles as early as 1988, a preliminary system named "incremental" had proven the feasibility of v-dosc and dv-dosc. ...

  • Page 10

    Dv-dosc dv-sub manual v2.0 nov 2001 10 4) for curved arrays, enclosure tilt angles should vary in inverse proportion to the listener distance (geometrically this is equivalent to shaping variable curvature arrays to provide equal spacing of individual element impact zones) 5) limits exist given the ...

  • Page 11

    Dv-dosc dv-sub manual v2.0 nov 2001 11 dv-dosc enclosure trapezoidal angles have been engineered so that 7.5 degrees per enclosure is obtained for tightly wrapped arrays. Starting from a tightly wrapped array (7.5 degrees between cabinets) the backs of the dv-dosc enclosures can be progressively ope...

  • Page 12

    Dv-dosc dv-sub manual v2.0 nov 2001 12 the configuration of transducers in a dv-dosc element is symmetrical with respect to the plane of propagation of the wave, i.E., the plane bisecting the horizontal coverage angle. High frequency transducers are located in the middle and low frequency transducer...

  • Page 13

    Dv-dosc dv-sub manual v2.0 nov 2001 13 correctly focussing the system on the audience - this is the benefit of wst and also the reason why correct focus of the system on the audience area is so important. Psychoacoustically, nearfield extension allows one to walk a considerable distance from a dv-do...

  • Page 14

    Dv-dosc dv-sub manual v2.0 nov 2001 14 summary of dv-dosc applications as a full range two-way system, dv-dosc can be used for speech reinforcement in corporate applications, houses-of-worship, television or theatrical productions. In some situations, dv-dosc can also be used for limited bandwidth m...

  • Page 15

    Dv-dosc dv-sub manual v2.0 nov 2001 15 0.2 training and qualifications v-dosc and dv-dosc are innovative systems which are based on a completely new approach to sound reinforcement. These systems can provide fully predictable results to the extent that no other existing system is capable of. However...

  • Page 16

    Dv-dosc dv-sub manual v2.0 nov 2001 16 1. Elements of the dv-dosc system dv-dosc is a complete, self-contained sound reinforcement system consisting of loudspeaker enclosures, amplifier racks, flying hardware, dedicated signal processing, packaging, cables and connectors. Dv-dosc system elements hav...

  • Page 17

    Dv-dosc dv-sub manual v2.0 nov 2001 17 general system block diagram a general block diagram representation of v-dosc and dv-dosc system components, cabling and signal flow is given in figure 3. Please refer to this for a general overview of the system. Figure 3a: system block diagram.

  • Page 18

    Dv-dosc dv-sub manual v2.0 nov 2001 18 figure 3b: example system configuration.

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    Dv-dosc dv-sub manual v2.0 nov 2001 19 1.1 dv-dosc system components (1) dv-dosc active 2-way loudspeaker enclosure, meeting wavefront sculpture technology criteria, with coplanar symmetric arrangement of loudspeaker components (2) dv-sub companion subwoofer for dv-dosc with three 15-inch components...

  • Page 20

    Dv-dosc dv-sub manual v2.0 nov 2001 20 (16) sub extension cable (do10p) subwoofer extension cable ,10 m length for use with dosub (17) sp.7 loudspeaker cable, 0.7 m length, four conductor (4 mm 2 cross sectional area per conductor) terminated in locking speakon connectors. Used for parallel linking ...

  • Page 21

    Dv-dosc dv-sub manual v2.0 nov 2001 21 dv-bump dv-anglen (0, -2, -3.75, -5.5, -7.5 degrees) flight-dv flight-dv dv-sub dv-angless dv-anglesd dv-anglesdp.

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    Dv-dosc dv-sub manual v2.0 nov 2001 22 sub cable dosub sub extension do10p sp.7 sp7 sp25 dofill do2w cc4fp figure 4: dv-dosc and accessories (not to scale).

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    Dv-dosc dv-sub manual v2.0 nov 2001 23 1.2 dv-dosc enclosure description figure 5: dv-dosc element - front and rear views dv-dosc contains two 8" loudspeakers (connected in parallel) and a 1.4" exit compression driver mounted on a custom dosc waveguide. The 8'' loudspeakers are individually rated at...

  • Page 24

    Dv-dosc dv-sub manual v2.0 nov 2001 24 figure 6: dv-angle p1 and p2 angle values the dv-bump flying bumper can be used for rigging dv-dosc standalone or for a variety of stacking applications. For standalone flying, there are 8 pick point holes available on the central spreader bar section of dv-bum...

  • Page 25

    Dv-dosc dv-sub manual v2.0 nov 2001 25 figure 7: dv-bump maximum recommended flown configurations are summarized as follows: dv-bump only (single point hang from central spreader bar points) - maximum 24 dv-dosc elements dv-bump + extension bar (single point hang from rear extension bar points) - ma...

  • Page 26

    Dv-dosc dv-sub manual v2.0 nov 2001 26 1.4 dv-dosc amplifier racks figure 9: l-acoustics amp rack rk12-4 the standard l-acoustics rk12-4 amplifier rack is twelve rack units high and contains four l- acoustics la 48 amplifiers. Overall external dimensions are 77 cm high (including casters) x 61 cm wi...

  • Page 27

    Dv-dosc dv-sub manual v2.0 nov 2001 27 resistant polyethylene cover provides protection for the rack during transport so that no external case is required. Four recessed aeroquip flytrack sections are mounted on both sides of the amplifier rack for flying applications. There are recesses in the top ...

  • Page 28

    Dv-dosc dv-sub manual v2.0 nov 2001 28 table 1: pad04 amp panel wiring chart.

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    Dv-dosc dv-sub manual v2.0 nov 2001 29 l-acoustics rk12-2m and rk12-2s are examples of two-amplifier-per-rack packaging. Rk12-2m includes a digital processor plus cd12 control distribution panel and can act as a standalone master rack. Rk12-2s contains 2 amplifiers (plus storage drawer) and acts as ...

  • Page 30

    Dv-dosc dv-sub manual v2.0 nov 2001 30 table 2: pad02 amp panel wiring chart.

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    Dv-dosc dv-sub manual v2.0 nov 2001 31 1.5 powering dv-dosc as stated above, one l-acoustics rk12-4 rack can power up to 6 v-dosc, 8 dv-sub or sb218 subwoofers or 12 dv-dosc. If both a and b sides of the rack are configured in 2-way mode and we consider the amplifiers as numbered 1 through 4 (from t...

  • Page 32

    Dv-dosc dv-sub manual v2.0 nov 2001 32 table 5: recommended amplifier power ratings for 100 hz lr24 hpf load (ohms) hf section power rating (gain = 32 db) lf section power rating (gain = 32 db) 8 > 300 w > 600 w 4 > 600 w > 1200 w 2.8 > 900 w > 1800 w tables 6 and 7 give a cross reference of l-acous...

  • Page 33

    Dv-dosc dv-sub manual v2.0 nov 2001 33 cabling options for connecting to either rk12-2 or rk12-4 are shown below: breakout at the loudspeaker end: 2-way comb connector v-dosc cable do7 or do25 dofill adapter breakout at the amplifier rack: 2-way comb connector do2w adapter cc4fp speakon barrel exten...

  • Page 34

    Dv-dosc dv-sub manual v2.0 nov 2001 34 1.6 dv-sub enclosure description figure 14: dv-sub dv-sub contains three 15'' loudspeakers mounted in a vented bandpass configuration. Individual 15'' loudspeakers are rated at 8 ohms and connected in parallel to provide a nominal impedance of 2.7 ohms. Note: t...

  • Page 35

    Dv-dosc dv-sub manual v2.0 nov 2001 35 1.7 dv-sub flying system dv-sub features two sets of recessed side panels on each side of the enclosure that are used in conjunction with three different types of angle bar for rigging purposes. Dv-angless angle bars are used for rigging sub-to-sub in flown or ...

  • Page 36

    Dv-dosc dv-sub manual v2.0 nov 2001 36 dv-sub rigging is compatible with dv-bump and the rigging system is rated for up to 6 dv-sub deep. When flown 6 deep, the overall weight of the system is 552 kg (1217 lbs). Pick point hole number #5 on the central spreader bar of dv-bump will produce a dead han...

  • Page 37

    Dv-dosc dv-sub manual v2.0 nov 2001 37 figure 17: illustration of dv-sub rigging configurations 1.8 powering dv-sub one l-acoustics rk12-4 rack can power up to 8 dv-sub where one dv-sub is driven per amplifier channel (rk12-2 can power 4 dv-subs). The power rating for dv-sub is 57 vrms long term (pi...

  • Page 38

    Dv-dosc dv-sub manual v2.0 nov 2001 38 1.9 dv-dosc control four digital signal processing units are currently supported and specified by l-acoustics for controlling the dv-dosc system: xta dp 226, dp 224 and bss fds 355 (omnidrive compact), fds 366 (omnidrive compact plus). Xta or bss processors are...

  • Page 39

    Dv-dosc dv-sub manual v2.0 nov 2001 39 the bottom line is that making sure that dv-dosc is used properly is in everyone’s best interest and it is up to the qualified v-dosc technician and certified v-dosc engineer to maintain quality control standards. Quality control starts with good sound design, ...

  • Page 40

    Dv-dosc dv-sub manual v2.0 nov 2001 40 3-way presets are also provided for dv-dosc plus l-acoustics sb115 (single 15'') and sb218 (dual 18'') subwoofers. Two types of presets are provided for each subwoofer: 3w (100 hz hpf for dv-dosc) and 3wx (80 hz hpf for dv-dosc). The 3w preset is intended for a...

  • Page 41

    Dv-dosc dv-sub manual v2.0 nov 2001 41 d) bss fds 355 version 6 0801 presets table 11: bss fds 355 presets.

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    Dv-dosc dv-sub manual v2.0 nov 2001 42 e) bss fds 366 version 6 0801 presets table 12: bss fds 366 presets.

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    Dv-dosc dv-sub manual v2.0 nov 2001 43 f) xta dp224 version 6 0801 presets table 13 : xta dp224 presets.

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    Dv-dosc dv-sub manual v2.0 nov 2001 44 g) xta dp226 version 6 0801 presets table 14: xta dp226 presets.

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    Dv-dosc dv-sub manual v2.0 nov 2001 45 1.7 control signal distribution the control signal distribution architecture adopted for v-dosc and dv-dosc allows maximum flexibility while providing a scaleable approach that can be used for small, medium and large systems. Let's consider a large system appli...

  • Page 46

    Dv-dosc dv-sub manual v2.0 nov 2001 46 1.8 co 24 control output panel figure 18: co24 control output panel digital signal processor outputs are assigned to multi return lines via the co 24 control output panel. Internally, xlr outputs are patched from the digital processor to the 24x female xlr patc...

  • Page 47

    Dv-dosc dv-sub manual v2.0 nov 2001 47 1.9 md 24 multi distro panel as seen in the system block diagram of figure 3, a multi distro panel is required onstage for distribution of multi return snake lines from the foh mix position. A single multi distro panel is required – typically, the multi distro ...

  • Page 48

    Dv-dosc dv-sub manual v2.0 nov 2001 48 1.10 cd12 control distro panel as an alternative to the traditional ''crossovers-in-a-drive rack-at-foh'' approach described above, the cd 12 control distribution panel is available for applications where the digital processor is mounted in the amplifier rack (...

  • Page 49

    Dv-dosc dv-sub manual v2.0 nov 2001 49 4-way + 2 mode crossover output crossover channel assignment cd 12 female xlr tail 1 sub ca-com a sub 2 v-dosc low ca-com a low 3 v-dosc mid ca-com a mid 4 v-dosc high ca-com a high 5 dv-dosc low ca-com a 2-way fill low 6 dv-dosc high ca-com a 2-way fill high i...

  • Page 50

    Figure 21: system architecture using rk12-2m master rack and rk12-4.

  • Page 51

    Dv-dosc dv-sub manual v2.0 nov 2001 51 2. Dv-dosc array specifications 2.1 isocontour in the horizontal plane horizontal directivity of a dv-dosc array according to aes recommendations, directivity is specified over an angular window with no more than 6 db deviation. For the case of dv-dosc, the -6d...

  • Page 52

    Dv-dosc dv-sub manual v2.0 nov 2001 52 2.2 wavefront sculpture in the vertical plane flat dv-dosc array flying or stacking dv-dosc elements with zero degree angles between all enclosures produces a flat array. In this case, the whole array behaves acoustically like a vertically-oriented, flat, conti...

  • Page 53

    Dv-dosc dv-sub manual v2.0 nov 2001 53 curved array of 8 dv-dosc elements can provide a maximum vertical coverage of 8 x 7.5° = 60° while still satisfying wst criteria. The constant curvature array is the simplest type of convex curvature dv-dosc array. This configuration should only be used for sma...

  • Page 54

    Dv-dosc dv-sub manual v2.0 nov 2001 54 used as downfill (under v-dosc) while dvarray2 can be used to simulate dv-dosc used as upfill/longthrow (on top of v-dosc). Note: for dv-dosc, site angles are not referenced to the trapezoidal enclosure wall – they are referenced to a line that is perpendicular...

  • Page 55

    Dv-dosc dv-sub manual v2.0 nov 2001 55 although detailed blueprints are not necessarily required, the more information that can be obtained on a venue for defining the audience geometry the better. Typically, plan and section views are available for most venues upon request. In situations where such...

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    Dv-dosc dv-sub manual v2.0 nov 2001 56 b) optimization procedure the calculated beam display indicates the effective vertical coverage of the array above frequency f 1 , where f 1 is defined as the low frequency limit of the clarity domain, i.E., above f 1 wst criteria are fully satisfied and cylind...

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    Dv-dosc dv-sub manual v2.0 nov 2001 57 in array geometrical data cells, the physical dimensions of the array are displayed including: the overall depth of the array (in the x dimension referenced to the downstage rigging point), the overall height of the array (in the z dimension), and the bottom el...

  • Page 58

    Dv-dosc dv-sub manual v2.0 nov 2001 58 vertical coverage of the array is calculated as the sum of all interelement angles. As discussed above, this coverage becomes effective at f 1 , defined as the lowest frequency of the clarity domain. For all frequencies higher than f 1 , the vertical coverage a...

  • Page 59

    Dv-dosc dv-sub manual v2.0 nov 2001 59 3.75 degrees, respectively, to the recommended bottom elt site angle (dv>v-dosc) given in cell t37. This is necessary to compensate for the 3.75 degree trapezoidal angle of the dv-dosc enclosure. Dv-dosc pick point utility a pick point calculation utility is al...

  • Page 60

    Dv-dosc dv-sub manual v2.0 nov 2001 60 the user can also define the y coordinates for each array (distance off center line) and the azimuth angle in degrees (i.E., aiming or panning angle of the array). Note: to simulate a center cluster, simply set ''y location'' equal to zero. B) optimization proc...

  • Page 61

    Dv-dosc dv-sub manual v2.0 nov 2001 61 array 2000 spreadsheet calculation examples cutview sheet horizontal isocontour sheet figure 26a: array 2000 spreadsheet calculation example (lcr dv-dosc system).

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    Dv-dosc dv-sub manual v2.0 nov 2001 62 figure 26b: simulating dv-dosc under v-dosc figure 26c: simulating dv-dosc on top of v-dosc.

  • Page 63

    Dv-dosc dv-sub manual v2.0 nov 2001 63 3. Elements of sound design 3.1 multiple array concepts reducing array interaction it is well known that the collective radiation of sound by a number of loudspeakers located close to each other results in interference that creates frequency-dependent directivi...

  • Page 64

    Dv-dosc dv-sub manual v2.0 nov 2001 64 3.2 stacked or flown? Although flown systems are generally preferred by most sound engineers, there are good arguments to support both solutions. In many cases the answer is dictated by logistics that are venue-specific, i.E., sometimes it simply isn’t possible...

  • Page 65

    Dv-dosc dv-sub manual v2.0 nov 2001 65 flying guidelines for single point hangs, the flying system is rated for a maximum of 24 dv-dosc elements without the extension bar and 12 dv-dosc elements with the extension bar. Particular attention must be paid to the height at which the array is flown when ...

  • Page 66

    Dv-dosc dv-sub manual v2.0 nov 2001 66 3.3 subwoofers subwoofers are used to extend the frequency response of the dv-dosc system down to 25-30 hz and to increase the overall spl without increasing the potential for audience hearing loss. General guidelines for the use of subwoofers the number of sub...

  • Page 67

    Dv-dosc dv-sub manual v2.0 nov 2001 67 ♦ use a lcr sub array configuration with the l,r arrays oriented at 45 degrees offstage. This can give excellent results in terms of horizontal evenness provided that the same number of subs are used for l, c, and r systems. Note: always time align and check th...

  • Page 68

    Dv-dosc dv-sub manual v2.0 nov 2001 68 central location, ground stacked this configuration optimizes the radiated energy. All subwoofers are acoustically coupled and the floor acts as a mirror that virtually doubles the number of subs. Given the same number of subs, the overall pressure obtained by ...

  • Page 69

    Dv-dosc dv-sub manual v2.0 nov 2001 69 sub/low enclosure and also provides an operating bandwidth that corresponds to that of the v-dosc low section. The 200 hz crossover point is intended for closely coupled configurations except for coplanar flown configurations, i.E., when dv-sub arrays are flown...

  • Page 70

    Dv-dosc dv-sub manual v2.0 nov 2001 70 4-way presets for dv-dosc and dv-sub or sb218 subwoofers 4-way presets are provided for flown dv-dosc + dv-sub arrays when used in conjunction with ground stacked dv-sub or sb218 subwoofers. A 1.5:1 dv-dosc:subwoofer ratio is recommended (for example: 3 dv-dosc...

  • Page 71

    Dv-dosc dv-sub manual v2.0 nov 2001 71 4. Installation procedures in the following sections, detailed installation procedures for stacking and flying dv-dosc are presented. Please follow these procedures carefully and at all times remain safety-conscious. 4.1 stacked systems stacking dv-dosc standal...

  • Page 72

    Dv-dosc dv-sub manual v2.0 nov 2001 72 note: as a reference for angle bar orientation, the ball end of the angle bar should always be facing outwards (even when attaching to the dv-bump). Place the second dv-dosc on top of the bottom enclosure by mating the two front rigging posts on the second elem...

  • Page 73

    Dv-dosc dv-sub manual v2.0 nov 2001 73 (i) place v-dosc bump into position (ii) dv-bump locator studs mate with holes on v-dosc bump (iii) dv-bump mounted inside v-dosc bump (iv) insert locator pin.

  • Page 74

    Dv-dosc dv-sub manual v2.0 nov 2001 74 (v) use dv-pin81 to secure locator pin (vi) overview of dv-bump secured to v-dosc bump (vii) attach rear screwjacks to v-dosc bump (viii) select 3.75 deg (middle hole) for rear points on dv-bump.

  • Page 75

    Dv-dosc dv-sub manual v2.0 nov 2001 75 (ix) dv-angle pre-attached in the 3.75 degree position (x) front rigging tabs mate with locator slots on dv-bump (xi) pin front points first using dv-pin25 (xii) then pin the rear points - note: by pre-selecting the angle, the tab on dv-anglep1 acts as a stop w...

  • Page 76

    Dv-dosc dv-sub manual v2.0 nov 2001 76 (xiii) pre-attach two more dv-angle bars at desired angle (xiv) stack the second dv-dosc enclosure (xv) pin front points first, rear points last using dv-pin25 (xvi) use dv-angle at 3.75 (rear) and 7.5 (front) degree positions as a site for adjusting the focus ...

  • Page 77

    Dv-dosc dv-sub manual v2.0 nov 2001 77 stacking on top of v-dosc to fly dv-dosc on top of v-dosc, dv-bump is attached to the v-dosc bumper to act as a stacking platform as in the standalone stacking procedures outlined above. For stability reasons, the maximum number of dv-dosc elements that can be ...

  • Page 78

    Dv-dosc dv-sub manual v2.0 nov 2001 78 (i) dv-bump and v-dosc bumper (ii) raise and level the v-dosc bumper (iii) place dv-bump inside v-dosc bumper (iv) attach locator pin into position using dv-pin81.

  • Page 79

    Dv-dosc dv-sub manual v2.0 nov 2001 79 (v) attach rear dv-angle and mount the first element (vi) continue to build the stack (vii) note bridling arrangement in front (viii) entire system is now ready to fly.

  • Page 80

    Dv-dosc dv-sub manual v2.0 nov 2001 80 stacking on top of sb218 subwoofers for this application, four circular pads are provided on dv-bump that mate with the stacking runner recesses on the top panel of the sb218 subwoofer. Side notches in dv-bump are also available that allow a ratchet strap to be...

  • Page 81

    Dv-dosc dv-sub manual v2.0 nov 2001 81 (i) note circular discs on dv-bump (ii) these mate with stacking runner recesses on sb218 (iii) dv-bump placed into position (iv) double stud to ring fitting attached to sb218 flytrack (alternative: run a ratchet around the entire stack).

  • Page 82

    Dv-dosc dv-sub manual v2.0 nov 2001 82 (v) ratchet strap secures dv-bump to the sb218 (vi) rear dv-angle pre-attached at desired angle (vii) bottom dv-dosc mounted, attached using dv-pin25 (viii) pre-attach next set of dv-angle.

  • Page 83

    Dv-dosc dv-sub manual v2.0 nov 2001 83 (ix) second dv-dosc placed into position (x) then secured using dv-pin25 (front first then rear) (xi) use dv-angle n instead of dv-angle p1… (xii) for more downwards tilt.

  • Page 84

    Dv-dosc dv-sub manual v2.0 nov 2001 84 stacking dv-sub subwoofers when stacking dv-subs, the stacking runners on the bottom of enclosures mate with the recesses on the tops of adjacent enclosures while the stack is being built. For this application, there are two options for securing a stack of dv-s...

  • Page 85

    Dv-dosc dv-sub manual v2.0 nov 2001 85 bottom dv-sub in position, second dv-sub with dv-angless pre-attached crown the bottom front edge of the second dv-sub rotate/lower the second dv-sub into position and position all four dv- angless in the corresponding slots of the bottom enclosure's rigging pa...

  • Page 86

    Dv-dosc dv-sub manual v2.0 nov 2001 86 repeat the same procedure to stack 3 dv-subs high the stack - secured using 8 dv-angless and 16 dvpin25.

  • Page 87

    Dv-dosc dv-sub manual v2.0 nov 2001 87 stacking dv-dosc on top of dv-subs there are two options for stacking dv-dosc: with, or without dv-bump. Procedure 1: stacking without dv-bump when stacking on stages or risers, reduced downwards tilt requirements for the stacked dv-dosc system may allow for th...

  • Page 88

    Dv-dosc dv-sub manual v2.0 nov 2001 88 (i) pre-attach dv-anglesd (front) and dv-anglesdp (rear) to dv-sub (ii) note: the ''fat'' part of dv-anglesd and dv-anglesdp is oriented towards the center of dv-sub on both sides (iii) place dv-dosc in position (inverted) and secure the front 2 points (iv) lif...

  • Page 89

    Dv-dosc dv-sub manual v2.0 nov 2001 89 (v) pre-select the angle / pre-attach dv-angle p1 or p2 for the second dv- dosc elements and continue to build the stack (vi) the finished stack of dv-sub and dv-dosc.

  • Page 90

    Dv-dosc dv-sub manual v2.0 nov 2001 90 procedure 2: stacking with dv-bump in this case, dv-bump is placed on top of the upper dv-sub and serves as a stacking platform for dv-dosc. Dv-anglen bars can be used for downwards tilt, and from ground level, stacking 3 dv- sub enclosures high puts dv-dosc at...

  • Page 91

    Dv-dosc dv-sub manual v2.0 nov 2001 91 (i) dv-bump secured to dv-sub stack using a ratchet strap. Dv-anglen preinstalled for rear attachment points (ii) dv-dosc installed - note how dv-anglen provides downwards tilt (iii) 3 high dv-sub stack provides a good height as a stacking platform. With the bo...

  • Page 92

    Dv-dosc dv-sub manual v2.0 nov 2001 92 4.2 flown systems standalone flying with dv-bump flying a dv-dosc array is fast and easy. When properly prepared and organized, handling time can be significantly reduced in comparison with conventional systems. Installation is optimum when 2-3 people are avail...

  • Page 93

    Dv-dosc dv-sub manual v2.0 nov 2001 93 referring to the angle values that were pre-calculated for each element using array 2000, pre- attach pairs of dv-angle bars at the rear of all dv-dosc elements of the array (while they are still face down in their flight cases). Remember to keep the ball/tab e...

  • Page 94

    Dv-dosc dv-sub manual v2.0 nov 2001 94 (i) dv-dosc lined up in flight-dv cases (ii) pin the fronts of all dv-dosc using dv-pin25 (iii) use 3.75 degree for rear when attaching dv-bump.

  • Page 95

    Dv-dosc dv-sub manual v2.0 nov 2001 95 (iv) pre-attach all rear dv-angle (ball end up) (v) pre-select the desired angle (vi) dv-bump attached, dv-angle pre-attached (vii) connect dv-dosc enclosures in groups of three.

  • Page 96

    Dv-dosc dv-sub manual v2.0 nov 2001 96 (viii) lower detail between adjacent blocks of 3 dv-dosc (ix) as cabinets lift off … (x) pin adjacent blocks of 3 together as the gaps close.

  • Page 97

    Dv-dosc dv-sub manual v2.0 nov 2001 97 (xi) note: single point hang from spreader bar section on dv-bump (xii) front view of the flown array.

  • Page 98

    Dv-dosc dv-sub manual v2.0 nov 2001 98 (xiii) single point hang from rear point on extension bar gives 90 degrees coverage with 12 dv-dosc (xiv) 90 degrees vertical coverage running from parallel to vertical with respect to floor level.

  • Page 99

    Dv-dosc dv-sub manual v2.0 nov 2001 99 trim and angle adjustments at this point there are only two adjustments left - trim height of the array and tilt angle of the entire flown system. If two motors are used for standalone flying, the front motor is used to set the proper height of the whole array....

  • Page 100

    Dv-dosc dv-sub manual v2.0 nov 2001 100 pair of radios is useful while one person walks the room and visually inspects the array while a second person operates the motors. Alternatively, a digital inclinometer with remote display of array tilt angle (example: lucas control systems model 0256-01) can...

  • Page 101

    Dv-dosc dv-sub manual v2.0 nov 2001 101 flying under v-dosc with dv-down typically, 3-4 dv-dosc are recommended for flying under v-dosc for downfill applications. The maximum number of dv-dosc that can be flown under v-dosc is 6. In most cases, dv-dosc elements will be used at the maximum angle betw...

  • Page 102

    Dv-dosc dv-sub manual v2.0 nov 2001 102 (i) pre-attach dv-down on either side of dv-dosc (ii) use dv-pin25 to connect front points of all dv-dosc (iii) rotating leg on bottom v-dosc flipped down, angle strap not attached on bottom element (iv) align rotating leg with holes on dv-down.

  • Page 103

    Dv-dosc dv-sub manual v2.0 nov 2001 103 (v) attach dv-down using u-pin and locking safety (vi) preconnect all dv-angle at the rear of dv-dosc (vii) pin all dv-dosc at the rear using dv-pin25 (viii) connect angle straps on bottom v-dosc.

  • Page 104

    Dv-dosc dv-sub manual v2.0 nov 2001 104 (ix) raise the array - note the gap (x) tighten screwjacks to remove this gap (xi) dv-dosc flown under v-dosc.

  • Page 105

    Flying dv-sub standalone when flying dv-sub standalone, up to 6 dv-subs deep can be flown from dv-bump (single or two point hang). Please refer to the photo sequence below in addition to the following description of dv- sub rigging procedures. To fly the system, the first dv-sub enclosure is located...

  • Page 106

    (i) dv-anglesd pre-attached - note that the stacked hole position has been selected and the ''fat'' part of the angle bar is oriented towards the center (ii) dv-bump placed into position and secured using 4 x dv-anglesd and 8 x dv-pin25 (iii) float the first enclosure, pre-attach 4 x dv-angless, lan...

  • Page 107

    Dv-dosc dv-sub manual v2.0 nov 2001 107 lower 1 st dv-sub into position and attach using 4 dv-pin25.

  • Page 108

    Flying dv-dosc under dv-sub (3+1 configuration) when rigging small configurations of dv-dosc under a single dv-sub (e.G., 1 dv-sub with 3 dv- dosc underneath), it is possible to fly the system in the same manner as dv-dosc standalone, i.E., assemble the elements while they are face down on the groun...

  • Page 109

    Dv-dosc dv-sub manual v2.0 nov 2001 109 fact that all fronts are pinned together and can pivot, plus all rear angles were pre-attached in the previous step. Pre-connect the rear point only for the first dv-dosc to the dv-sub, i.E., use 2 x dv-pin25 to secure dv-dosc to the dv-anglesdp that was pre-a...

  • Page 110

    (i) dv-anglesdp pre-attached to the rear of dv-sub (ii) dv-anglesd pre-attached to the front of dv-sub (iii) dv-bump attached to dv-sub using 4 x dv-anglesd and 8 x dv-pin25 (iv) dv-dosc located behind the array.

  • Page 111

    Dv-dosc dv-sub manual v2.0 nov 2001 111 (v) attach rear points only (dv-sub to dv-dosc) (vi) houston - we have liftoff… (vii) lift dv-dosc into position, secure front points using 2 x dv-pin25 (viii) the flown array.

  • Page 112

    Flying dv-dosc under dv-sub (larger configurations) when rigging larger configurations of dv-dosc under dv-sub (e.G., 2 dv-sub with 6 dv-dosc underneath), there are 2 possible procedures: 1) fly the system in the same manner as dv-dosc standalone, i.E., assemble the elements while they are face down...

  • Page 113

    Dv-dosc dv-sub manual v2.0 nov 2001 113 and inserting dv-pin25. This operation is facilitated by the fact that all fronts are pinned together and can pivot, plus all rear angles were pre-attached. Connect all elements to the amp racks using appropriate cables and adaptors (sp and do2w or do plus dof...

  • Page 114

    Procedure 1 (i) dv-sub with dv-bump attached using 4 x dv-anglesd and 8 dv-pin25 (ii) second dv-sub with 4 x dv-angless pre-attached (iii) 2 x dv-sub physically connected (iv) dv-anglesd (front) and dv-anglesdp (rear) pre-attached.

  • Page 115

    Dv-dosc dv-sub manual v2.0 nov 2001 115 (v) preconnect the first dv-dosc to dv-sub, front and rear. (do not attach the dv-dosc #2 to dv-dosc #1) (vi) all dv-dosc attached at front, in blocks of 3 at the rear (except for dv-dosc #1 to #2) (vii) dv-dosc #2 to #1 then blocks of 3 are attached as the ar...

  • Page 116

    Dv-dosc dv-sub manual v2.0 nov 2001 116 procedure 2 (i) dv-dosc are pre-attached in blocks of 3 (ii) flip dv-dosc onto dv-sub dolleys to position under the dv-sub array (iii) standalone dv-sub techniques (see above) are used to fly the dv-sub array (iv) dv-dosc front point attachment using dv-angles...

  • Page 117

    Dv-dosc dv-sub manual v2.0 nov 2001 117 procedure 2 (v) the procedure is repeated with subsequent blocks of 3 dv-dosc.

  • Page 118

    Safety rules caution: please follow the guidelines below when flying dv-dosc and dv-sub and do not exceed these guidelines under any circumstances dv-bump only (single point hang from central spreader bar points) - maximum 24 dv-dosc elements dv-bump + extension bar (single point hang from extension...

  • Page 119

    Dv-dosc dv-sub manual v2.0 nov 2001 119 • proper chain motor maintenance, installation and operation is absolutely necessary under all circumstances. • if motors are exposed to outdoor weather conditions for any length of time, cover the motors in plastic to prevent them from getting wet. • l-acoust...

  • Page 120

    Dv-dosc dv-sub manual v2.0 nov 2001 120 5. Maintenance and installation tools 5.1 recommended maintenance procedures regular maintenance procedures (monthly) include: component sweep (using sine wave generator or other suitable test system) and polarity check to ensure that all speakers and drivers ...

  • Page 121

    Dv-dosc dv-sub manual v2.0 nov 2001 121 5.3 spare parts speakers dv-dosc hf driver (complete) hp bc22 dv-dosc hf diaphragm hs bc22 dv-dosc 8'' loudspeaker hp ph81 dv-dosc 8'' recone kit hs ph81 dv-sub 15'' loudspeaker hp ph153 dv-sub 15'' recone kit hs ph153 connectors female panel mount speaker con...

  • Page 122

    Dv-dosc dv-sub manual v2.0 nov 2001 122 5.4 recommended installation tools inclinometer – digital protractor 3600 or lucas control systems 02506-01 remote laser rangefinder (bushnell yardage pro 600 or leica disto basic with tripod/inclinometer) portable computer with excel for running array portabl...

  • Page 123

    Dv-dosc dv-sub manual v2.0 nov 2001 123 6. Specifications 6.1 dv-dosc element specifications l-acoustics specifications are based on measurement procedures which produce unbiased results and allow for realistic performance prediction and simulation. Some of these specifications will appear conservat...

  • Page 124

    Dv-dosc dv-sub manual v2.0 nov 2001 124 figure 28: dv-dosc element – line drawing.

  • Page 125

    Dv-dosc dv-sub manual v2.0 nov 2001 125 table 17: dv-dosc weight per number of cabinets number of cabinet cabinet dv-dosc weight weight cabinets (kg) (lbs) 2 63.6 140.2 3 95.4 210.3 4 127.2 280.4 5 159.0 350.5 6 190.8 420.6 7 222.6 490.7 8 254.4 560.9 9 286.2 631.0 10 318.0 701.1 11 349.8 771.2 12 3...

  • Page 126

    Dv-dosc dv-sub manual v2.0 nov 2001 126 6.2 dv-sub specifications l-acoustics specifications are based on measurement procedures which produce unbiased results and allow for realistic performance prediction and simulation. Some of these specifications will appear conservative when compared with othe...

  • Page 127

    Dv-dosc dv-sub manual v2.0 nov 2001 127 figure 29: dv-sub line drawing.

  • Page 128

    Dv-dosc dv-sub manual v2.0 nov 2001 128 appendix 1: how does dv-dosc behave with respect to wst criteria the second wavefront sculpture technology criterion: step operation is fulfilled by a dv-dosc array at low/mid frequencies. With reference to figure 30: acoustic centers between 8" speakers are s...

  • Page 129

    Dv-dosc dv-sub manual v2.0 nov 2001 129 appendix 2: how does the dosc waveguide work? There is no mysticism surrounding the dosc waveguide. It is simply the result of careful analysis of the wave path through the waveguide and the resulting wave-front shape. With respect to the above figure, the wav...