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Table of Contents
Summary of Contents for LA Audio Electronic SPX20
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Page 1: Operation Manual
STEREO SOURCE SELECTOR/PREAMPLIFIER OPERATION MANUAL Version - 1 April 2000... -
Page 2: Table Of Contents
Introduction Installation Inspection and un-packing Operating environment CE standards Power requirements Signal levels External connections Warranty Description of controls Inputs section Outputs section Headphones section Applications Using the SPX20 Circuit description Specifications Page 2 CONTENTS Page 9-10... -
Page 3: Introduction
Each of the inputs on the SPX20 has a level trim with sufficient range to cope with +4dBu and -10dBV equipment and for balancing the levels between the different sources. -
Page 4: Installation
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 immediately and do not discard any of the packing. -
Page 5: Signal Levels
An incorrect fuse could cause damage to the unit and may constitute a fire hazard. If you carry your SPX20 from one country to another it is very important to ensure the voltage is compatible. For your information the unit can be internally rewired for use in 230V, or 115V and 100V countries - contact your dealer for information. - Page 6 Pin 2 = Hot (+) Fig 2.6.3: Pin arrangement for XLR inputs on the SPX20 Pin 1 Screen Pin 2 Pin 3 Cold For unbalanced operation join pins 1 and 3 and connect to Screen (signal ground) and use pin 2 as Hot (signal +).
- Page 7 LA Audio 230V 50Hz SERIAL No: FUSE T50mA OUTPUT 1 & 2 Outputs on the SPX20 are via 1/4" TRS jacks - see Fig 2.6.3 Ring Cold Sleeve Screen Output amplifiers on the SPX20 are 'ground compensated balanced impedance' type.
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Page 8: Warranty
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... -
Page 9: Description Of Controls
Setting up the SPX20 To ensure maximum headroom, noise and crosstalk performance it is important to have the correct signal levels within the SPX20. Please follow the following simple procedure. When using equipment with a +4dBu output turn TRIM to almost CW and to fully CCW for -10dBV equipment as a starting point. -
Page 10: Outputs Section
HEADPHONES SECTION VOLUME control Controls the headphones signal level. Fully CCW is off. The headphone amplifier on the SPX20 is designed to drive headphones with an impedance from 8Ω to 400Ω. POWER indicator The green POWER indicator is lit whenever power is applied to the unit. -
Page 11: Applications
In this application the SPX20 is used as the control centre for selecting sources and controlling levels in the monitors. Although this requires the SPX20 to mounted in a readily accessible place it does offer a number of advantages - The two separate outputs with on-off switching and level controls can be used to drive different types of monitor speakers. - Page 12 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 the monitor section of the mixing console.
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Page 13: Circuit Description
Right • Fig 6.1.1 SPX20 block diagram showing main signal paths INPUT 1 The input is routed through a pair of half normalled TRS jacks and into a differential amplifier. The TRIM varies the gain of the differential amplifier so ensuring maximum headroom at all gain settings. -
Page 14: Specifications
INPUTS 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 &...