MX4 Multiplexer
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MX4
4 Channel Microphone Multiplexer
Expands the capability of single channel RTA's
Averages up to four microphone positions
Allows spatial averaging
Analyzes overall response


A multiplexer is a device that allows a single channel Real Time Analyzer to average information from up to four microphone positions in a single test. When this information is processed by an analyzer that has "time averaging", the resulting curve is called "spatially averaged". Spatial averaging is recommended by all of the major film cinema/home theater organizations, including LucasFilm, and Dolby Laboratories.

The advantage of multiplexing is that the resulting curve on the real time analyzer reflects the overall response of the room across the entire seating area, rather than only the acoustics of a single point in the room. The multiplexer itself is essentially a small 4x1 mixing board combined with a switching network that automatically samples information from each of the microphones for a specified amount of time.

The MX4 allows the user to enable single channels or any combination of channels, allowing for comparison of individual microphone locations versus the spatially averaged data from multiple microphone tests. Each of the four channels has a gain control to allow the user to match the input level from different locations.

The MX4 can be used with the TEF20, TEF25 and with all Gold Line 1/3 octave Real Time Analyzers as well as with most other popular models. The MX4 can be provided with three or four (Product ID MX4310 or MX4410) Model TEF04 instrument microphones depending on your requirements.


SPECIFICATIONS

INPUTS:
Channels: 4
Max. level: Mic. 117dB SPL
Typical input impedance: 1.2k ohms
Noise floor: 35dB SPL
CMRR:
60Hz - 1kHz: 70dB
20Hz - 20kHz: 65dB
Phantom power: each microphone input, 12Vdc, 1.2k ohm x 2
Connectors: XLR, 3 pin jack, Pin1 Ground, Pin 2 +, Pin 3 -

OUTPUTS:
Channels: 1
Type: Active Balanced
Maximum Level: +10dBu
Output Impedance: 180 ohms
Connectors: XLR, 3 pin plug, Pin 1 Ground, Pin 2 +, Pin 3 -

MAXIMUM GAIN, Microphone input: 7dB
Adjustment range per channel: ±7dB

FREQUENCY RESPONSE: 20Hz - 20kHz ±1dB

NOISE, 20Hz to 20kHz, Typical: Output noise all inputs off; -85dBu

CROSSTALK, Typical: Adjacent inputs/outputs @ 1kHz; -88dB

MICROPHONES:
Model MX4 - none supplied
Model MX4310 - Supplied with 3 Gold Line TEF04 omnidirectional electret condenser microphones
Model MX4410 - Supplied with 4 Gold Line TEF04 omnidirectional electret condenser microphones

POWER REQUIREMENTS: 12Vdc @ 500mA; UL approved battery eliminator supplied.

Approvals: - CE Mark
  • Emissions: - EN 55022 B - FCC Class B
  • Immunity: - EN 55024 B

    SIZE (W x H x D); WEIGHT: 7-7/8" x 2-5/8" x 7"; 2 lbs.

    CASE MATERIAL: High Impact ABS


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