Macro-Tech 24x6 Reference Manual

Summary of 24x6

  • Page 1

    Level level on off 30 27 24 21 18 15 12 9 6 3 0 enable odep 30 27 24 21 9 6 3 0 signal / ioc 18 15 12 ch1 ch2 (2400) (600) level level on off 30 27 24 21 18 15 12 9 6 3 0 enable odep 30 27 24 21 9 6 3 0 signal / ioc 18 15 12 ch1 ch2 (3600) (1200) models: macro-tech 24x6 & 36x12 some models may be ex...

  • Page 2: Three Year

    Worldwide summary of warranty the crown audio division of crown international, inc., 1718 west mishawaka road, elkhart, indiana 46517-4095 u.S.A. Warrants to you, the original purchaser and any subsequent owner of each new crown 1 product, for a period of three (3) years from the date of purchase by...

  • Page 3: Warning

    The information furnished in this manual does not include all of the details of design, production, or variations of the equipment. Nor does it cover every possible situation which may arise during installation, operation or main- tenance. If your unit bears the name “amcron,” please substitute it f...

  • Page 4: Contents

    Page 4 macro-tech 24x6 & 36x12 power amplifiers contents 1 welcome ............................................................................ 7 1.1 unpacking ................................................................... 7 1.2 features ............................................................

  • Page 5: Illustrations

    Page 5 macro-tech 24x6 & 36x12 power amplifiers illustrations 1.1 macro-tech 36x12 amplifier ...................................................... 7 2.1 front facilities ........................................................................... 8 2.2 rear facilities ..................................

  • Page 6

    Page 6 macro-tech 24x6 & 36x12 power amplifiers.

  • Page 7: 1 Welcome

    Page 7 macro-tech 24x6 & 36x12 power amplifiers fig. 1.1 macro-tech 36x12 amplifier 1 welcome congratulations on your purchase of a macro-tech ® dual level professional power amplifier. Your amplifier has a separate high-power and medium-power chan- nel, making it ideal for biamplified systems. The ...

  • Page 8: 2 Facilities

    Page 8 macro-tech 24x6 & 36x12 power amplifiers level level on off 30 27 24 21 18 15 12 9 6 3 0 enable odep 30 27 24 21 9 6 3 0 signal / ioc 18 15 12 ch1 ch2 (3600) (1200) a b c d d c b e f fig. 2.1 front facilities 2 facilities a. Dust filter the dust filters remove large particles from the air at ...

  • Page 9

    Page 9 macro-tech 24x6 & 36x12 power amplifiers fig. 2.2 rear facilities h. Reset switches the reset switches are used to reset the breakers that safeguard each power supply from overload. I. P.I.P. Module the standard p.I.P.-fx is included with your amplifier. It provides female xlr input connector...

  • Page 10: 3 Installation

    Page 10 macro-tech 24x6 & 36x12 power amplifiers 3 installation 3.1 mounting macro-tech amplifiers are designed for standard 19 inch (48.3 cm) rack mounting as well as “stack” mount- ing without a cabinet. In a rack cabinet, it is best to mount them directly on top of each other. This provides effic...

  • Page 11

    Page 11 macro-tech 24x6 & 36x12 power amplifiers 3.3 wiring this section describes the most common way to install the macro-tech 24x6 and 36x12. Each model is de- signed for biamplified systems and includes both a high-power and a medium-power channel. The input and output terminals are located on t...

  • Page 12

    Page 12 macro-tech 24x6 & 36x12 power amplifiers 3.3.1 input connection both the balanced xlr and phone jack inputs have a nominal impedance of 20 k ohms (10 k ohms with un- balanced wiring) and will accept the line-level output of most devices. Female xlr input connectors are pro- vided on the stan...

  • Page 13

    Page 13 macro-tech 24x6 & 36x12 power amplifiers solving input problems sometimes large subsonic (subaudible) frequencies are present in the input signal. These can damage loudspeakers by overloading or overheating them. To attenuate such frequencies, place a capacitor in se- ries with the input sig...

  • Page 14

    Page 14 macro-tech 24x6 & 36x12 power amplifiers shielded pair cable is another effective way to reduce or eliminate hum resulting from inductive coupling. Ground loops often result when two or more devices are improperly grounded. This causes undesirable stray currents that may produce hum in the o...

  • Page 15

    Page 15 macro-tech 24x6 & 36x12 power amplifiers 1. Note the load resistance of the loudspeakers connected to each channel of the amplifier. Mark this value on the load resistance line of the nomograph. 2. Select an acceptable damping factor and mark it on the damping factor line. Your amplifier can...

  • Page 16

    Page 16 macro-tech 24x6 & 36x12 power amplifiers note: the components shown in figure 3.12 are com- monly available from most electronic supply stores. Typical fuses help prevent damage due to prolonged overload, but provide essentially no protection against damage from large transients. To minimize...

  • Page 17: 4 Operation

    Page 17 macro-tech 24x6 & 36x12 power amplifiers 4 operation 4.1 precautions macro-tech amplifiers are protected from internal and external faults, but you should take the following pre- cautions for optimum performance and safety: 1. Warning: never strap the outputs together for parallel-mono opera...

  • Page 18

    Page 18 macro-tech 24x6 & 36x12 power amplifiers 4.3 protection systems macro-tech amplifiers provide extensive protection and diagnostics capabilities. Protection systems in- clude odep, “standby” mode, fuses (or breakers), and special thermal protection for the unit’s transformers. 4.3.1 odep crow...

  • Page 19

    Page 19 macro-tech 24x6 & 36x12 power amplifiers ing the drive level. Second, odep data is fed to the back panel p.I.P. Connector so advanced p.I.P. Mod- ules like the iq–p.I.P.–smt can use it to monitor and control the amplifier. With odep, the show keeps going because you get the maximum power wit...

  • Page 20

    Page 20 macro-tech 24x6 & 36x12 power amplifiers brilliance and the signal/ ioc indicators should function normally (remain off if no signal is present; flash if a signal is present). 4. After the mute delay, turn up the level of your audio source to the maximum desired level. 5. Turn up the level c...

  • Page 21: 5 Technical Information

    Page 21 macro-tech 24x6 & 36x12 power amplifiers 5 technical information 5.1 overview your amplifier incorporates several new technological advancements including low stress output stages, real- time computer simulation of output transistor stress, an advanced heat diffuser embodiment and a modular ...

  • Page 22

    Page 22 macro-tech 24x6 & 36x12 power amplifiers supply becomes larger, the power transistors must dissipate more heat. Also, the lower the resistance of the power transistors, the more voltage you can de- liver to the load. But when you lower the resistance of the transistors, you increase the curr...

  • Page 23

    Page 23 macro-tech 24x6 & 36x12 power amplifiers signal from the gain pot, and drives the voltage trans- lator stage. The voltage translator stage channels the signal to the last voltage amplifiers (lvas), depending on the sig- nal polarity, from the error amp u104-a. The +lva (q105,q125) and the –l...

  • Page 24

    Page 24 macro-tech 24x6 & 36x12 power amplifiers fig. 5.5 circuit block diagram (channel 1) onl y one channel shown npn hi output stage npn l o w output stage pnp l o w output stage pnp hi output stage + output +vcc –vcc translator lv a lv a +vcc –vcc bias current limit translator balance input stag...

  • Page 25: 6 Specifications

    Page 25 macro-tech 24x6 & 36x12 power amplifiers 6 specifications the following specifications apply to 120 vac, 60 hz units in stereo mode with 8 ohm loads and an input sensitivity of 26 db unless otherwise specified. 120 vac, 60 hz units: these units have a dedicated trans- former for 120 vac, 60 ...

  • Page 26

    Page 26 macro-tech 24x6 & 36x12 power amplifiers the output level. Sensitivity: a three-position switch located inside the p.I.P. Compartment used to select one of three input sensitivities for both channels: a sensitivity of 1.4 volts for full rated output, a fixed voltage gain of 26 db or a sensit...

  • Page 27

    Page 27 macro-tech 24x6 & 36x12 power amplifiers 10 100 1 k 10 k 100 k frequency (hz) +2 +1 0 –1 –2 –3 –4 db –5 –6 –7 4 ohm 8 ohm 1 watt 504.0 126.8 31.8 milliohms 8.0 2.0 6 db 20 100 1 k 10 k 20 k 400 200 100 0 600 800 1000 1200 1400 frequency (hz) 8 ohm 10 100 1 k 10 k 100 k frequency (hz) 2 ohm f...

  • Page 28

    Page 28 macro-tech 24x6 & 36x12 power amplifiers techron tef ® +45˚ 0˚ –45˚ 100 1 k 10 k 20 k frequency (hz) tef ® measurement fig. 6.4 typical phase response (measured with tef ® analyzer) fig. 7.1 macro-tech 24x6 power draw, current draw and thermal dissipation at various duty cycles 8 ohm l o a d...

  • Page 29: 7 Ac Power Draw and

    Page 29 macro-tech 24x6 & 36x12 power amplifiers 8 ohm l o a d 50% 40% 30% 20% 10% 1190 970 750 530 310 1622 1359 1096 833 570 1663 1348 1034 719 405 551 457 362 267 172 1994 1613 1232 852 471 2583 2128 1673 1218 762 12.0 9.7 7.5 5.3 3.1 16.7 13.5 10.4 7.2 4.1 20.0 16.2 12.4 8.6 4.7 duty cycle ac ma...

  • Page 30: 8 Accessories

    Page 30 macro-tech 24x6 & 36x12 power amplifiers 8 accessories 8.1 p.I.P. Modules one advantage of macro-tech amplifiers is the ability to customize them using p.I.P. (programmable input processor) and pip2 modules. Macro-tech amplifiers are equipped with an edge card connector inside the back panel...

  • Page 31

    Page 31 macro-tech 24x6 & 36x12 power amplifiers clp programmable input processor (p.I.P.) 3 1 2 gnd i n p u t i n p u t c h - 2 c h - 1 push push p.I.P.–clp detects and prevents overload. Its compressor is driven by the amplifier’s built-in ioc error detection circuitry. Unlike typical signal-drive...

  • Page 32

    Page 32 macro-tech 24x6 & 36x12 power amplifiers 8.2 level control security kit the ma-lock security accessory can be used to se- cure your amplifier’s level controls in situations where the front panel controls are subject to tampering. The ma-lock security kit includes the necessary hard- fig. 8.2...

  • Page 33: 9 Service

    Page 33 macro-tech 24x6 & 36x12 power amplifiers 9 service this unit has very sophisticated circuitry which should only be serviced by a fully trained technician. This is one reason why each unit bears the following label: caution: to prevent electric shock, do not remove covers. No user serviceable...

  • Page 35

    Detach and send with unit. Crown factory service information shipping address: crown international, inc., factory service, plant 2 sw, 1718 w. Mishawaka rd., elkhart, in 46517 phone: 1-800-342-6939 or 1-219-294-8200 fax: 1-219-294-8301 owner’s name: __________________________________________________...