MX4310 4 Channel Microphone Multiplexer Phantom/12V
The MX4310 microphone 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 MX4310 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 MX4310 can be used with the TEF20 and with all Gold Line 1/3 octave Real Time Analyzers as well as with most other popular models. The MX4310 is provided with three DSP30 model TEF04 reference microphones.
l 4 Channel Microphone Multiplexer
l Expands the capability of single channel RTA's
l Averages up to four microphone positions
l Allows spatial averaging
l Analyzes overall response
MX4310 Package Contents:
l 3 pcs.TEF04P Omnidirectional Microphone
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
XLR, 3 pin jack, Pin1 Ground, Pin 2 +, Pin 3 -
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: (Supplied) 3 Gold Line TEF04P omnidirectional electret condenser, require 12Vdc phantom, 1.2kohms x 2, 20 - 20kHz 1dB, balanced XLR.
Power Requirements:
12Vdc @ 500mA; UL approved battery eliminator supplied.
Size (W x H x D): 7-7/8" x 2-5/8" x 7"
Weight: 2 lbs.
Case Material: High Impact ABS
Manual: NL, GB, FR
Approvals: CE, RoHS and WEEE