Crest audio MM 623 SPECIFICATIONS

Output

Left/Right

Aux

Min Load

Impedance

600 Ohms

Nom

+4 dBu

Max

+21 dBu

+19 dBm

+21 dBu

+19 dBm

Balanced

UnBalanced

Balanced

Connector

Ground

Crest Audio Inc.

16-00 Pollitt Dr. Fair Lawn, NJ 07410

TEL: 201.909.8700 FAX: 201.909.8744

www.crestaudio.com

Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications.

9/5/01

v.1.5

SERIES

Features

Description

• six balanced mic/line inputs (transformer optional )

• mic/line inputs assignable per channel to L,R and Aux buses

• channel one mute capability, variable threshold

• two selectable RCA stereo or mono line inputs

• three electronically balanced line outputs: Master L, R and Aux

• four-band EQ on Master L, R out

• remote Master level control

• euro style I/O connectors

• 48 VDC phantom power, selectable per channel

• remote stereo input select or remote stereo mute

The MM 623 is a versatile, high quality mixer designed with the professional in mind. Offering six microphone inputs, two selectable stereo inputs, and such features as bus assignment, phantom power, remote master, Left, Right, and Aux outputs, this compact unit is perfectly suited to modern diverse applications. All inputs and outputs are electronically balanced. Equalization is performed by an active, four-band, fixed frequency stereo EQ. There are three five-segment LED meters monitoring each of the main outputs.

Each of the microphone inputs has switchable phantom power and a 20 dB pad for line level signals. Channel one has a variable threshold for ducking all other inputs. The unit offers remote select of the two stereo inputs. The unit can also be set as master or slave and all audio and control buses are linkable. All connections are offered on pluggable Euro connectors. The MM 623 offers a multitude of features in one EIA rack space.

623

Program Audio Mixer

Output Level

0 dBu = 0.775 V (rms) 0 dBu = 1 mW

Output Specifications:

*A4500019*

Specifications

MMTM623 Program Audio Mixer

Specifications

MMTM623 Program Audio Mixer

Architects’ & Engineers’ Specifications:

The mixer shall have six electronically balanced microphone or line inputs. The mixer shall also have two stereo unbalanced line inputs. All inputs shall be routable to any or all of three master buses, Left, Right and Aux. Each microphone input shall include selectable 48 Volt phantom power. Channel one shall have a variable mute threshold over all other channels. Each input shall have a Signal/Clip indicator that activates green at -20 dB, and

turns red at 2 dB below clipping. The mixer shall have three electronically balanced outputs, Left, Right and Aux, each with its own master output control and five LED meter array. The mixer shall have remote master capability for each of the master L,R buses. There shall be remote select for the two stereo inputs, rear panel global 100 Hz low cut filter for the mic inputs, master/slave link mode switch, and audio bus linking. The mixer shall have a shelving low EQ with 15 dB boost or cut starting at

70 Hz, a peak/dip low mid EQ with 15 dB boost or cut at 250 Hz. The unit shall be housed in a rugged metal chassis 1.75” tall by 19” wide by

8.75” deep. One-inch mounting flanges will be provided on each side. The unit shall operate from 120V AC, 60 Hz power. The mixer shall be capable of driving +21 dBu into a balanced load from the Left, Right or Aux outputs, from 20 Hz to 20 kHz. +0 to -2 dB into 600 Ohms with less than 0.1% distortion and with system hum and noise at least 80 dB below rated output.

Test Conditions: 120 Vac 60 Hz maintained throughout testing.

Input Specifications:

Input Input gain- Input Level, dBu Impedance pot setting Balanced/

Input (Ohms) Min.* Nom.** Max. Unbalanced Connector

Max gain Microphone 2k +60 dB -76 dBu -56 dBu -39 dBu + without pad Min gain Balanced -

+10 dB -25 dBu -4 dBu +13 dBu Ground

Max gain Microphone 2k +40 dBu -56 dBu -36 dBu -19 dBu + with pad Min gain Balanced -

-10 dB -5 dBu +16 dBu +33 dBu Ground

Max gain Microphone 2k +60 dB -74 dBu -54 dBu -37 dBu + without pad Min gain Balanced (optional +20 dB -34 dBu -14 dBu +3 dBu Ground transformer)

Max gain Microphone 2k +40 dB -54 dBu -34 dBu -17 dBu + with pad Min gain Balanced (optional 0 dB -14 dBu +6 dBu +23 dBu Ground transforme)r

Stereo Line 10k N/A -20 dBV -10 dBV +7 dBV Unbalanced RCA jacks

0 dBu = 0.775 V (rms)

0 dBu = 1.00 V (rms *Min. input level (sensitivity) is the smallest signal that will produce a nominal output with controls set at maximum gain. **Nominal settings are defined as all controls set at center detent for nominal output. Microphone gain control is as specified.

Noise:

Output Signal/Noise (typical) Test Conditions

Left/Right 100 dB All level controls down

84 dB Master level control nominal

Channel level controls down

80 dB All controls nominal

All channels assigned Mic gain minimum

Aux 95 dB All level controls down

92 dB Master level control nominal

Channel level controls down

81 dB All controls nominal

All channels assigned Mic gain minimum

gain

frequency response

total harmonic distortion and noise

equivalent input noise (EIN)

common mode rejection ratio (mic input)

crosstalk

phantom power

remote volume control

channel mute

signal/clip indicators

power requirements

dimension (H x W x D)

weight

MM 623 program audio mixer

Mic input range without pad: 10 dB to 60 dB Mic input to output without pad: 80 dB max Mic input range with pad: -10 dB to 40 dB Mic input to output with pad: 60 dB max

Mic input range without pad (optional transformer): 20 dB to 60 dB Mic input to 0utput without pad (optional transformer): 80 dB max Mic input range with pad (optional transformer): 0 dB to 40 dB

Mic input to output with pad (optional transformer): 60dB max

20 Hz - 20 kHz+0 dB/-1 dB

<0.1% typical 20 Hz - 20 kHz; Mic to L-R out (22 Hz - 22 kHz BW)

-128 dBu Mic input terminated with 150 Ohms

>70 dB typical 20 Hz - 20 kHz

>70 dB typical adjacent channels (1 kHz) >60 dB typical output to output (1 kHz)

+48 Volts at mic + and - inputs

10k Ohm potentiometer 30 dB attenuation 100k Ohm potentiometer 60 dB attenuation

>60 dB attenuation

Input Channel Status:

Green: -20 dBu Red: 2 dB below clipping

Output Level Meters:

-24: -20 dBu

-6: -2 dBu 0: +4 dBu +6: +10 dBu Clip: 2 dB below clipping

Domestic: 120 Vac, 60 Hz 15 Watts nominal Export: 230 Vac, 50/60 Hz 15 Watts nominal

1.75" x 19” x 8.75" (45 mm x 483 mm x 222 mm)

7.4 pounds (3.4 kg)