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MX-508 Mic/Line Mixer

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Front Panel

General Specifications

THD at +4 dBu, 20Hz-20KHz <0.05%
THD at +20dBu, 30Hz-10KHz <0.05%
IMD (SMPTE) at +20dBu <0.05%
HUM & NOISE (20Hz-20KHz at max preamp gain)
Equivalent input hum and noise <-127dBu
Residual output noise, all levels at minimum <-100dBu
Master Level and one Ch. Level at nom <-80dBu
Aux 1 or 2 Out, Aux Master and one Ch. Aux at nom . <-80dBu

MAXIMUM VOLTAGE GAIN (±2dB)
Mic Input to Master Output, 600 ohm load 84dB
Line Input to Master Output, 600 ohm load 42dB

AUX SENDS
Mic Input to Aux Master Output, pre ch. level 76dB
Mic Input to Aux Master 2 Output, post ch. level 92dB
SUB Input to Master Output 12dB

AUX RETURNS 1 or 2 to Master Output 30dB
TAPE/CD In to Master Output 34dB

FREQUENCY RESPONSE
20Hz-20KHz +0.5/-1.0dB
50Hz-10KHz +0/-0.5dB

EQUALIZATION
Low ±12dB at 70Hz, shelving
Mid ±12dB peaking, 140Hz-8KHz
High . ±12dB at 15KHz, shelving

CROSSTALK
Adjacent inputs, 20Hz-20KHz <-65dB
Mic Input to Master Output, 1KHz <-65dB
Mic Input to Master Output, 20KHz <-55dB

INDICATORS
VU METERS (Selectable to Main or Aux Outputs) 0VU = +4dBu
PEAK INDICATORS Indicator on Inputs, L & R outputs, lights 3dB below clipping

PHANTOM POWER
(+48 VDC applied to all Mic Inputs, switchable on front panel)
Maximum total current draw = 80mA.
Maximum single channel current draw = 14mA.
Gradual power-up and down to eliminate "pops".

SHIPPING WEIGHT 20 lbs. maximum with 8 input transformer options installed

POWER REQUIREMENTS 100-240 VAC, 50-60 Hz, 35 watts

DIMENSIONS:
19" wide x 5.25" high x 8.0" deep.

 Architect Specifications

MX-508
The unit shall be an eight input stereo mixer having separate transformer- isolated balanced outputs for both left and right channels. There shall be an electronically balanced mono-summed output with separate front panel level control.

Each input channel shall have level and stereobalance controls on one concentric pot. Two aux sends on each channel must be provided with one internally wired pre-fader EQ and the other post fader/EQ. The Pre/Post determination of the Aux sends shall be configurable via circuit board jumper connections. Each input channel shall have three-band equalization control with adjustable mid-band frequency sweep. The equalization shall consist of high and low shelving points being fixed at 70Hz and 15kHz, and the mid-band peaking EQ control must be adjustable between 140Hz and 8kHz.

Each input channel shall have 40 dB of available attenuation and a switch for mic/line selection on the front panel, as well as a 20 dB mic input pad on the rear panel. Each input channel shall have in/out insert points on separate 1/4. phone connections, 1/4. phone connectors for balanced line input sources, and XLR electronically-balanced connectors for microphones (each input channel shall additionally have the option of internal plug-in transformers).

Phantom power of +48VDC on each input must be available via a front panel switch. There shall be two Master Aux Sends provided and two panable Master Aux Returns (one stereo and one mono). There shall be an additional stereo CD/Tape input on RCA jacks with level control to the Mains or Aux 1. Separate stereo RCA tape outputs must also be provided. There shall be Pre-Master Sub In/Out patch points for left and right and Aux Sub outputs on 1/4. phone jacks for linking other mixers. A selectable Headphone output with level control to monitor either Left and Right or Aux 1 and 2 must be provided on the front panel.

Overall gain available from Mic Input to Master Output shall be 84 dB, and the Output level shall be +24dBm into 600 ohms. The mixer unit shall be no higher than three rack spaces and must be fully covered under a five year warranty. The mixer must be manufactured in America, with a shipping weight of 15 pounds.

The mixer shall be the model MX-508, manufactured by Ashly Audio, Inc. No other unit shall be acceptable unless data submitted from an independent test laboratory verifies that the above size/performance specifications are met.

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