MMP-10 - Multiplexer USL - Free user manual and instructions

Product Type	Microphone Multiplexer
Number of Microphone Channels	4
Microphone Type	Laboratory grade test microphones, calibrated with multiplexer
Calibration	Each microphone calibrated with its multiplexer; factory-adjusted individual trim potentiometers
Scan Modes	Individual microphone selection or sequential automatic scan
Scan Rate	Adjustable, 7 to 21 Hz
Output Level	Adjustable overall output level; factory set to 15mV (-36 dB) with 1k ohm load
Power Source	9V battery (alkaline recommended)
Current Drain	Approx. 20 mA
Low Battery Indicator	Blinking red LED; unit resets to microphone 1
Output Connector	3-pin female XLR
Remote Control	Momentary in-line push button on audio cable; cycles through microphones and scan mode
Compatibility	Works with any audio spectrum analyzer; adapters available for various models
Included Accessories	Theater microphone seat mounts, adapter to 3-pin male XLR (MMP-ADS)
Construction	Rugged; small diameter lightweight umbilical cable
Warranty	90 days from purchase new from authorized dealer; limited to repair or replacement
Approvals	Meets CE Approval Standards
Manufacturer	Ultra★Stereo Labs, Inc., San Luis Obispo, CA, USA

Frequently Asked Questions - MMP-10 USL

How do I calibrate the MMP-10 for the first time?

Set up your analyzer with its own microphone and pink noise to produce 85 dBc. Then disconnect the analyzer mic, connect the MMP-10 with its four microphones, adjust the overall potentiometer R45 to match the level. Verify all four mics read the same.

What is the function of the remote switch on the cable?

Pressing the momentary switch cycles through states: Mic 1, Mic 2, Mic 3, Mic 4, and automatic scan mode. Pressing again resets to Mic 1.

How should I position the microphones for room equalization?

Place the MMP-10 about 2/3 back from the screen, off-axis of center speaker. Mic 1 at that position; other microphones in a diamond pattern within the central area of the room, with screens facing up toward the ceiling.

What does a blinking red LED indicate?

The low battery indicator blinks when battery voltage drops too low. The unit will reset to microphone 1 and may cause switching or measurement errors. Replace the battery with a standard 9V alkaline.

How do I adjust the scan rate?

Open the back cover and adjust potentiometer R60. Observe the display: if too slow, the display bounces; adjust for a smooth stable display. The factory setting is 10 Hz, adjustable range 7 to 21 Hz.

Which microphones are included with the MMP-10?

Four laboratory grade test microphones are included, each calibrated with the multiplexer. They are intended for measurement and come with theater seat mounts.

Can I use the MMP-10 with any audio analyzer?

Yes, it works with any audio spectrum analyzer. The output is a 3-pin female XLR connector. Adapters (MMP-ADS, MMP-AD1, MMP-AD2, MMP-AD5) are available for specific models like Audio Control, Ivie, Dolby CP-500, etc.

What is the purpose of the MMP-10 in a cinema setting?

It allows room equalization using four microphones instead of one, providing better sound averaging across the audience area. The multiplexer sequentially scans microphones to capture a spatial average.

How are the microphones mounted?

Microphones are placed horizontally with the screen facing up. Theater microphone seat mounts are included for easy placement on seats or surfaces.

What is the warranty period and coverage?

Ultra★Stereo Labs warrants the MMP-10 against defects in material and workmanship for 90 days from purchase new from an authorized dealer. Warranty covers repair or replacement but does not cover damage from misuse, modification, or improper installation.

USER MANUAL MMP-10 USL

Ultra★Stereo Labs, Inc. warrants that the MMP-10 will be free from defects in material and workmanship under normal usage for a period of ninety (90) days after its purchase new from an authorized dealer. Our obligation under this warranty is limited to repairing or replacing any product or component which we are satisfied does not conform with the foregoing warranty and which is returned to our factory, freight paid, or serviced by one of our authorized contractors. The foregoing Warranty is exclusive and in lieu of all other warranties, whether expressed or implied. Such warranty shall not apply to any product or component (A) repaired or altered by anyone other than Ultra★Stereo Labs or an authorized service contractor; (B) tampered with or altered in any way or subjected to misuse, negligence or accident or (C) which has been improperly connected, installed or adjusted otherwise than in accordance with Ultra★Stereo Labs instruction. This warranty does not cover damage to surface finishes, normal wear, or failure resulting from abuse.

Table of Contents

Features 4

How It Works.... 5

Initial Calibration ...... 6

Setup Procedure 7

Microphone Placement 8

Microphone Mounting 9

Low Battery Indicator 9

Remote Switch Circuits 10

Specifications 11

Please record the following information for your records:

Model: ____ Serial Number: ____

Date of Purchase: ____ Purchased from: ____

MMP-10 Features

Four laboratory grade test microphones. ①

Each microphone is calibrated with its multiplexer to insure utmost accuracy.

(Top View)

Individual microphone selection or sequential scan.

Adjustable scan rate.

Blinking low battery indicator.

Overall output level adjust.

Works with any audio spectrum analyzer.

Small diameter, lightweight umbilical cable from the multiplexer to your analyzer.②

Theater microphone seat mounts included.

Rugged construction.

(Front View)

How It Works

The MMP-10 contains four high quality microphone preamplifiers, followed by an adjustable switching circuit. Microphone signals are routed through the unit in several different configurations.

On powerup, only microphone one is amplified and routed through the MMP-10 to your analyzer.

The remote switch at the analyzer end of the MMP-10 cable permits selection of other microphones. Pressing the switch once selects microphone two. Press it again and microphone three is selected; once more and microphone four is selected.

Pressing it once again starts automatic scan mode, which cycles through all four microphones, one at a time. Pressing it one more time resets the MMP-10 to microphone one.

Typical analyzer equipment is shipped with only a single microphone. The MMP-10 allows you to expand your equipment to four microphones. [Such multi-microphone measurement techniques achieve far superior acoustical results in auditoriums due to the averaging effect.]

MMP-10 Front

graph TD
    A["Input"] --> B["Device 1"]
    A --> C["Device 2"]
    A --> D["Device 3"]
    A --> E["Device 4"]
    F["Output"] --> B
    F --> C
    F --> D
    F --> E

MMP-10 Top

Initial Calibration

The first time you use your new MMP-10, you should set the output level to match the single microphone supplied with your analyzer. To accomplish this find a suitable location and set up your analyzer with its own microphone.

Using pink noise through the sound system, adjust the amplifier level to produce a normal display (85 dbC). Next disconnect the analyzer microphone and connect the MMP-10 (with its four microphones) to the analyzer.

Open the MMP-10 back cover. Select microphone one and adjust the overall potentiometer R# 45 inside the MMP-10 to achieve the same level on your analyzer display as measured with the analyzer microphone. Verify that the remaining three microphones have the same reading.

(Note: it is not necessary to adjust individual trim potentiometers, R10, R20, R30, R40, as these are adjusted at the factory.)

Switch the MMP-10 to scan mode and observe the display of all four microphones. Different analyzers will integrate this switched signal in various ways. Adjust the scan rate potentiometer, R60, to achieve a smooth stable display. If the timing is too slow, the display will bounce.

Setup Procedure

Locate the MMP-10 approximately 2/3 back from the screen, off axis of the center speaker, usually between the center speaker and the right speaker to allow for viewing from the booth. Place microphone one at this position. Place the remaining mics. in a diamond pattern within the central area of the room. The microphones should be positioned horizontally with the microphone's screen facing up, toward the ceiling (Figure2). Insert the microphone connectors into the appropriate jacks on the MMP-10.

Connect the audio cable to the MMP-10 and switch the unit on. The red LED for microphone one will be on. Be sure to position the MMP-10 so you can view the LED display from the booth.

Plug the other end (i.e. momentary switch side) of the audio cable into your analyzer up in the projection booth. Switch on Pink Noise. Your MMP-10 wakes up with microphone one selected. Verify you have a signal from microphone one on your analyzer. Select microphone two, three then four to verify operation.

Select multiplex mode (indicated by the LEDs flashing in order: red, green, green green) and set your analyzer to the proper level and commence room equalization.

The multiplexer has been designed to allow for easy room averaging with a small but accurate four microphone multiplexer system. Room equalization using only one microphone is not recommended due to room modes. Using four microphones and MMP-10 multiplexer will allow for the best sound for the greatest number of seats in the room.

Remote control of the MMP-10 is achieved by using a momentary in-line push button located on the audio cable plugged into your analyzer. Pressing the button located on this cable cycles the MMP-10 through five states: Microphone 1, microphone 2, microphone 3, microphone 4 and multiplex (scan) mode.

Ideal Microphone Placement

Figure 1

The microphones should be placed in the listening environment as shown above (Figure 1). Variations may apply depending upon size and shape of the auditorium but a diamond formation is best for overall sound field measurement.

Mounting the Microphone

Figure 3

Low Battery Indicator

Low battery voltage can cause the unit to not switch properly, and may cause measurement errors. To avoid this, the MMP-10 incorporates a low battery sensing circuit. When the battery voltage drops too low, the unit will reset to microphone one, and the red LED will blink. Replace the battery with a standard 9V alkaline battery.

Remote Switch Circuits

A 3-pin female cord plug with a momentary on/off switch is a standard item in the MMP-10S kit. This switch cord will work with most balanced input analyzers.

3 PIN SWITCH CIRCUIT

MMP Adapters

The MMP-10 output is a 3-pin female XLR connector. Included is an adapter to a 3-pin male XLR connector (MMP-ADS). Other adapters are available to convert to almost any analyzer or sound processor:

Model #	Connector Type	For Use With
MMP-ADS	3-pin XLR (male)	Audio Control, Gold Line, Abacus ARTA-160, Clark Techniq, HP-8050
MMP-AD1	6-pin XLR (female)	Ivie 30, Ivie PC-40
MMP-AD2	3-pin Mini-XLR (male)	Abacus ARTA-80
MMP-AD5	1/8" Stereo Phone Plug	Dolby CP-500

Specifications

(1K ohm load on each leg of the balanced output)

Nominal microphone input level: -54 dB (2mv)

Maximum output level: -27 dBV (43mV) adjustable

Output impedance: 2K ohms

Number of microphone channels: 4

Individual microphone channel adjustment range: 9dB

Microphone scan rate: 7 to 21 Hz adjustable

Power source: 9 volt battery

Current drain: Approx. 20 ma.

Meets CE Approval Standards

Factory Settings

(1K ohm load on each leg of the balanced output)

Output level: 15mV (-36 dB)

Microphone scan rate: 10Hz

Ultra★Stereo Labs, Inc.

181 Bonetti Drive

San Luis Obispo, CA 93401 USA

Telephone [phone]

FAX [phone]

e-mail [e-mail]

USL,Inc.

Quality Cinema Products

© 1996, 1998 Ultra★Stereo Labs, Inc.

San Luis Obispo, CA, USA.

All Rights Reserved