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Table of contents for the manual
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Page 1
STEREO SOURCE SELECTOR/PREA MPLI FIER OPERATION MANUAL Version - 1 April 2000[...]
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Page 2
Page 2 CONTENTS Page 1. Intr oduction 3 2. Instal lation 4 2.1 Inspection and un-pack ing 4 2.2 Operat ing environment 4 2.3 CE standards 4 2.4 Power requirement s 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 4.3 Headphones section 10 5. A pplications 1 [...]
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Page 3
Page 3 1.0 INTRODUCTION The SPX20 is a six input st ereo source selector designed to ex tend the number of inputs and range of monitor ing f acilities available on a typical mixing console. However the SPX20 is suitable f or a wide range of monitoring applications including t ape dubbing, audio- visual and digital workstations and f or installat io[...]
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Page 4
Page 4 2.0 INSTA LLA T ION IMPO RTA NT : PLEA SE REA D THIS SECT ION BEFO RE USING THE SPX20 2.1 INSPECTIO N A ND UNPA CKING The SPX20 has been car efully packed at our factor y in a carton designed to withstand handling in tr ansit. Should the unit appear to hav e been damaged in t ransit notif y your dealer immediately and do not discard any of t[...]
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Page 5
Page 5 • Please check that your unit is correctly rated for the voltage in the country of operation. If the fuse r equires chang ing at any time please ensure t he correct f use is fitt ed. An incorrect fuse could cause damage t o the unit and may constitute a fire hazard. If you carry your SPX20 from one country to another it is very important t[...]
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Page 6
Page 6 Pin 1 = Screen Pin 2 = Hot (+) Pin 3 = Cold (-) PUSH Fig 2.6.3: Pin ar rangem ent for XLR inputs on t he SPX20 Pin 1 Screen Signal ground Pin 2 Hot Signal + Pin 3 Cold Signal - For unbalanced operation j oin pins 1 and 3 and connect to Screen (signal ground) and use pin 2 as Hot (signal +) . Input 1 also has a pair of fr ont panel inserts on[...]
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Page 7
Page 7 Plugging into the inserts jacks on t he front panel breaks the signal from the rear panel XLRs INPU T 2 & 3 These are balanced inputs on T RS jack s - 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 ar e all unbalanced inputs which have RCA/phono connecto[...]
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Page 8
Page 8 3.0 WA RRA NTY Your LA Audio SPX20 has been manuf actured t o a high standard using quality com ponents. If correct ly installed and operat ed the unit should g ive years of problem free oper ation. However in the event of a def ect in mat erial or workmanship causing f ailu r e of t he unit w i t hin one year of t he da t e of o r i g inal [...]
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Page 9
Page 9 4.0 DESCRIPTIO N OF CONTROLS 4.1 INPUTS SECTION INPUT 1 Left & Right sockets Thes e are insert points f or Input 1. Plugging into these connec tors break s the signal from Input 1's rear panel XLRs . They are intended to allow a quick and easy way of tem porarily connecting an external piece of equipm ent to the SPX20. TRI M control[...]
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Page 10
Page 10 4.2 OUTPUT SECT ION BA LANCE control This control allows adjus tment of the stereo c entre position. T he centre detent position gives equal lef t and right levels. Tur ning BALANCE fully CCW canc els all right output signals and vic e versa. BALANCE aff ects OUT PUT 1 & 2 and Headphones . DIM switch Pressing this switch in reduces outp[...]
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Page 11
Page 11 5.0 A PPL ICA TIONS The m ajority of mixing consoles, even quite expensive models of fer only 2 or possibly 3 monitoring inputs. So if you want to simultaneously connect a CD player, DAT machine, stereo cassett e deck, 2 t rack analog ue tape machine etc. you will have to use up input channels. These are often already used f or tape returns[...]
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Page 12
Page 12 Fig 5.1. 1 Connecting the SPX 20 as the main monit oring cont roller 5.2 A S A MONITOR EXTENDER If you prefer t o keep contr ol of the cont rol room m onitors within the mix ing console the SPX20 can be connected as shown in Fig 5.1.2. The SPX20 is now selected by pressing the 2T (2 t rack) return on the m onitor section of the mixing conso[...]
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Page 13
Page 13 6.0 CIRCUI T DESCRIPTION TRIM Left Right Select #1 LR MIX • • • Mix amp Tape Send L • Mix amp Tape Send R • • BALANCE • • MONO DIM LR • • • 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 • • • • INPUT 1 [...]
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Page 14
Page 14 7.0 SPECIFI CA TIONS INPUTS 1 electronically balanced, 20k Ω , XLR-F , pin 2 = hot 2 & 3 electronically balanced, 20k Ω , 1/4" TRS, T ip = hot 4, 5 & 6 unbalanced, 20k Ω , RCA/Phono, Centre pin = hot OUTPUTS TAPE RECORD 100R, RCA/Phono, Centre pin = hot OUT PUT 1 & 2 Type Ground sens ing, balanced im pedance 1/4"[...]