Assessments - 1, GPA: 4
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A! Ihe nominal 'oad impedance of 600 ohms, dBu figures may also be read as dBm. a power measure where 0 dBm is 1m W into 600 ohms 2. 20-20.000 Hz bandwidth, maximum gain. 3. On special order, models for 85-130 and 200-250 volts. 50-60 Hz. are available. For Input and Output Specifications see back page. DESCRIPTION The Electro-Voice ELX-1 mixer is a compact, high-performance audio mixer designed for professional applications where clean audio ana reliable operation are important. Features and performance make the ELX-1 ideally suited for broadcast and production recording applications. The ELX-1 can mount in a single rack space (with optional RM-1 rack mount kit) or set on any surface. Extensive rf filtering circuitry and shielding provides protection against rf interference GENERAL FEATURES • Optimum circuit design provides flat frequency response, low distortion, and low noise. • Space-saving, compact design uses only one rack space (1.75 in.). • Powerable from ac line, internal batteries, or external dc source, with automatic switchover. Detachable line cord. • Electro-Pulse™ indicator shows power status and battery condition, • Switchable low distortion 1 -kHz sine-wave oscillator facilitates level calibration. • Ten-segment, three-color PPM LED bargraph meter shows peak output level and has clip Indicators. Can be converted internally to VU characteristics. • Switchable output limiter prevents clipping. Yellow LED lights when limiting action occurs- INPUT SECTION FEATURES • A single 3-pin XLR-type connector accepts microphone and line-level inputs via a mic/line switch. • Circuitry incorporates rf filters and a balanced transformerless design for low distortion and high signal quality. • Switchable 30-volt phantom power is available at microphone inputs. • Input controls set gain of preamps for optimum noise performance with any input signal. • LED indicator at each input lights if clipping occurs. • Low-cut filters swrtchable at each input reduce low-frequency handling and background noise. OUTPUT SECTION FEATURES • Transformer-isolated output with binding posts. • Transformer-isolated output with 3-pin XLR-type connector and mic/line level select switch. • Headphone output, with separate power amp and level control, can drive any headphones or cue speaker. • Auxiliary input jack is for fifth input or for stacking additional mixers. • Two stacking jacks are for interconnection with additional mixers, and can be modified for insert patching. CONNECTIONS • All mic/line inputs have female 3-pin XLR-type connectors. Pin 2 is positive; pin 3 is negative. • The transformer-isolated output has a male 3-pin XLR-type connector and dual binding posts, • The headphone output is a three-connector ’A-inch phone jack. • All other connections on the mixer are two-conductor Vi-inch phone jacks. • All stacking and auxiliary are line-level inputs. ARCHITECTS’ AND ENGINEERS’ SPECIFICATIONS The mixer shall have four transformerless balanced input channels with rear-mounted female 3-pin XLR-type connectors, switch selectable for microphone or line-level sources Each input shall have the following front panel controls: LED clip indicator; low-cut filter switch with a 6 dB/octave filter slope at a corner frequency of 100 Hz; and a rotary level control. RF protection circuitry shall be incorporated into each balanced input. Each main input shall have 30 V dc remote microphone power applied to pins 2 and 3, with a rear-mounted master phantom power switch. There shall be a 'A-inch phone jack auxiliary input with the signal from this jack provided to the mix buss. Stacking input and output '/4-inch phone jacks shall be provided for the mix buss. There shall be a single monaural output. Output shall have a front panel rotary level control and a ten segment LED peak program meter. Output shali be transformer isolated with two secondary windings. Output connections shall be provided as follows: dual binding posts for a transformer-isolated output; male 3-pin XLR-type connector, switch selectable for a microphone or line-level transformer-isolated output. A chassis-ground connection shall be provided on a rear mounted binding post. A headphone level control and a three-conductor '/4-inch jack shall be provided on the front panel for headphones. The headphones shall monitor the mix buss prior to the output level control. An internal oscillator with a front panel switch shall provide a 1-kHz sine-wave signal to the mix buss. Sine-wave distortion of the oscillator shall be <1.5%. A limiter with a front panel switch shall be provided in the output amplifier circuitry after the output level control. Limiter threshold shall be +14 dBu. Front panel LED indicator shall light whenever limiting occurs. A main power switch shall be located on the front panel. The mixer shall operate on 100-130 V ac, 60 Hz (or 200-250 V ac, 50/60 Hz or 85-130 V ac. 50/60 Hz) and consume less than 12 watts. The mixer s...