- DL manuals
- LA Audio Electronic
- Amplifier
- SPX20
- Operation Manual
LA Audio Electronic SPX20 Operation Manual
Summary of SPX20
Page 1
Stereo source selector/preamplifier operation manual version - 1 april 2000
Page 2
Page 2 contents page 1. Introduction 3 2. Installation 4 2.1 inspection and un-packing 4 2.2 operating environment 4 2.3 ce standards 4 2.4 power requirements 4 2.5 signal levels 5 2.6 external connections 6-7 3. Warranty 8 4. Description of controls 9-10 4.1 inputs section 9 4.2 outputs section 10 ...
Page 3
Page 3 1.0 introduction the spx20 is a six input stereo source selector designed to extend the number of inputs and range of monitoring facilities available on a typical mixing console. However the spx20 is suitable for a wide range of monitoring applications including tape dubbing, audio-visual and...
Page 4
Page 4 2.0 installation important: please read this section before using the spx20 2.1 inspection and unpacking the spx20 has been carefully packed at our factory in a carton designed to withstand handling in transit. Should the unit appear to have been damaged in transit notify your dealer immediat...
Page 5
Page 5 • please check that your unit is correctly rated for the voltage in the country of operation. If the fuse requires changing at any time please ensure the correct fuse is fitted. An incorrect fuse could cause damage to the unit and may constitute a fire hazard. If you carry your spx20 from one...
Page 6
Page 6 pin 1 = screen pin 2 = hot (+) pin 3 = cold (-) push fig 2.6.3: pin arrangement for xlr inputs on the spx20 pin 1 screen signal ground pin 2 hot signal + pin 3 cold signal - for unbalanced operation join pins 1 and 3 and connect to screen (signal ground) and use pin 2 as hot (signal +). Input...
Page 7
Page 7 plugging into the inserts jacks on the front panel breaks the signal from the rear panel xlrs input 2 & 3 these are balanced inputs on trs jacks - see fig 2.6.3 for ubalanced operation wire as described above for input 1 inserts or use a mono jack plug. Input 4,5 & 6 these are all unbalanced ...
Page 8
Page 8 3.0 warranty your la audio spx20 has been manufactured to a high standard using quality components. If correctly installed and operated the unit should give years of problem free operation. However in the event of a defect in material or workmanship causing failure of the unit within one year...
Page 9
Page 9 4.0 description of controls 4.1 inputs section input 1 left & right sockets these are insert points for input 1. Plugging into these connectors breaks the signal from input 1's rear panel xlrs. They are intended to allow a quick and easy way of temporarily connecting an external piece of equi...
Page 10
Page 10 4.2 output section balance control this control allows adjustment of the stereo centre position. The centre detent position gives equal left and right levels. Turning balance fully ccw cancels all right output signals and vice versa. Balance affects output 1 & 2 and headphones. Dim switch pr...
Page 11
Page 11 5.0 applications the majority of mixing consoles, even quite expensive models offer only 2 or possibly 3 monitoring inputs. So if you want to simultaneously connect a cd player, dat machine, stereo cassette deck, 2 track analogue tape machine etc. You will have to use up input channels. Thes...
Page 12
Page 12 fig 5.1.1 connecting the spx20 as the main monitoring controller 5.2 as a monitor extender if you prefer to keep control of the control room monitors within the mixing console the spx20 can be connected as shown in fig 5.1.2. The spx20 is now selected by pressing the 2t (2 track) return on t...
Page 13
Page 13 6.0 circuit description trim left right select #1 l r mix • • • mix amp tape send l • mix amp tape send r • • balance • • mono dim l r • • • left on-off #1 • level 1 right left on-off #2 level 2 right headphones volume • • trim right select #2 • • left trim right select #4 • • left • • • • i...
Page 14
Page 14 7.0 specifications inputs 1 electronically balanced, 20kΩ, xlr-f, pin 2 = hot 2 & 3 electronically balanced, 20kΩ, 1/4" trs, tip = hot 4, 5 & 6 unbalanced, 20kΩ, rca/phono, centre pin = hot outputs tape record 100r, rca/phono, centre pin = hot output 1 & 2 type ground sensing, balanced imped...