Tech Works CI-MSI-22 Quick Reference Manual

Microphone and speaker interface

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CI-MSI-22

QUICK REFERENCE GUIDE

The MSI-22 is a Microphone and Speaker Interface for our Collaborative Intercom family of products.

The can be two Microphones (One from the Microphone Input; one from the PA-BUSS Input using a PA-MI-1)

Two Speaker outputs (One from the Speaker Output; one from the PA-BUSS output using a AS-1 or PA-402)

Basic Microphone / Speaker Interface Block Diagram (Transformers not shown for clarity)

Each input can be routed to an output or all outputs by placing routing jumpers inside the unit as desired.

The CI-BUSS interface performs the same function for additional units. The Microphone is processed

with ALC to be of constant level and passed to other Units in both directions as selected.

The ALC has an indicator for the Threshold of Limiting.

This indicator also serves as a setup indicator for adjusting the Microphone level.

Tech Works, Inc., 7430 Eastgate Road, Suite 130, Henderson, NV 89011

Direct Line: 702-846-1080 Toll Free: 1-800-813-1080

Web site

www.tech4people.com

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Page 1: Quick Reference Guide
The ALC has an indicator for the Threshold of Limiting. This indicator also serves as a setup indicator for adjusting the Microphone level. Tech Works, Inc., 7430 Eastgate Road, Suite 130, Henderson, NV 89011 Direct Line: 702-846-1080 Toll Free: 1-800-813-1080 Web site www.tech4people.com...
Page 2 INPUT 24VDC – 1.5 A Tech Works * YORBA LINDA * CA * 1-800-813-1080 * WWW.TECH4PEOPLE.COM Speaker Output: 25-Volts Maximum, 10-Watts Maximum; Two Position Euro-Style Barrier Strip: Speaker (+/- Microphone Input: Four Position Euro-Style Barrier Strip: Universal Microphone/Line Input (+/-);...
Page 3 Initial Adjustments: There are both Input and Output Controls with associated Indicators When the Indicators are green the associated control is enabled The Audio may be 'Keyed' depending on the Configuration and system setup Only attempt adjustments if the associated indicator is lighted green! The CI-BUSS uses a standard audio level of ~0dBm RMS The Digital Rotary Switch (3dB/Step) is used to set Microphone Gain The nominal Microphone gain is ~6dB, or less, into limiting...
Page 4 Configuration Options: The MSI-22 is designed to accommodate many applications. For most applications the factory default setting is sufficient. For ‘special’ applications a few jumpers may need to be moved. These Jumpers determine how the MSI-22 interacts with other Components of the System Before attempting a Configuration you should review the "BUSS Systems Guide"...