Shure A15BT User Manual

Printed in U.S.A.
©2009 Shure Incorporated
27C1916 (Rev. 5)
The A15BT matches, bridges, or isolates balanced and unbalanced devices of different
impedances and levels.
Impedance: XLR socket (Female), 33,000Ω
XLR plug (Male), 7500Ω, easily converted to 600Ω.
Unbalancing: Either end can be unbalanced by connecting pins 1 and 3.
Voltage difference: From 33,000Ω to 7500Ω, 6.4 dB
From 33,000Ω to 600Ω, 17.4 dB.
MEDIUM-IMPEDANCE SELECTION
As supplied, the A15BT XLR plug is at 7500Ω. To convert to 600Ω, refer to Figure 1 and
proceed as follows:
Remove the three-pin plug element by turning the screw counterclock-wise and 1.
withdrawing the element from the case.
Remove the GREEN lead pin jack from pin 3, and insulate the jack and bare 2.
lead.
Remove the tape from the pin jack on the WHITE lead and push the jack rmly 3.
onto pin 3.
Replace the plug element in the housing and fasten the screw rmly in place 4.
(turn clockwise).
Model A15BT User Guide
BRIDGING TRANSFORMER

Shure A15BT Specifications

General

Impedance	- Ω
Connector(s)	XLR Pin Connector (M), XLR Pin Connector (F)
Product color	Black
Frequency range	- GHz
Output impedance	600, 7500, 33000 Ω
Quantity	1

Weight and Dimensions

Width	19 mm
Height	89 mm

Summary

A15BT Bridging Transformer Features and Configuration

Medium-Impedance Selection

Instructions for converting the A15BT XLR plug from 7500Ω to 600Ω.

Typical Applications of the A15BT

Connecting 600Ω Output to High-Level Input

How to connect a 600Ω line output to the A15BT's 33,000Ω socket for bridging.

Matching High-Impedance Microphone to Recorder

Unbalancing both ends of A15BT for microphone to recorder connection.

Unbalanced Aux Input to Balanced Low-Impedance Output

Using A15BT to convert a balanced low-impedance device to an unbalanced Aux input.

Balanced 600Ω Line Output for Aux Input Units

Connecting A15BT to an Aux output unit for a balanced 600Ω line output.

A15BT Specifications and Diagrams

Frequency Response

Details the frequency response of the A15BT from 20 Hz to 20,000 Hz.

Impedance, Voltage Ratio, and Driving Source Levels

Specifies XLR impedance, voltage ratios, and maximum driving source levels.

Case and Dimensions

Describes the physical characteristics including case material and product dimensions.

Connector Wiring Diagram

Illustrates the internal wiring and pin connections for the XLR connectors.

Limited Warranty Information