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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:
1.
Remove the three-pin plug element by turning the screw counterclock-wise and
withdrawing the element from the case.
2.
Remove the GREEN lead pin jack from pin 3, and insulate the jack and bare
lead.
3.
Remove the tape from the pin jack on the WHITE lead and push the jack firmly
onto pin 3.
4.
Replace the plug element in the housing and fasten the screw firmly in place
(turn clockwise).
©2009 Shure Incorporated
27C1916 (Rev. 5)
Model A15BT User Guide
BRIDGING TRANSFORMER
Printed in U.S.A.
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Summary of Contents for Shure A15BT
- Page 1 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 withdrawing the element from the case.
- Page 2 Connect the 600Ω output to the 33,000Ω XLR socket of the A15BT. Unbalance the XLR plug on the A15BT and convert it to 7500Ω or 600Ω to provide the proper level and best signal- to-noise ratio. Connect the A15BT to the Aux input. In this configuration, the A15BT “bridges”...
- Page 3 Impedance XLR Pin Connector (M): 7500Ω or 600Ω XLR Socket Connector (F): 33,000Ω Voltage Ratio 7500 Ω 600 Ω Medium-impedance to high-impedance: +6.4 dB +17.4 dB High-impedance to medium-impedance: –6.4 dB –17.4 dB Driving Source Winding Being Maximum Impedance (ohms) Driven (ohms) Level (Volts) 7,500...
- Page 4 (2) years from the consumer’s original date of purchase directly from Shure or from a Shure-authorized reseller. At its sole option, Shure will repair or replace the defective product and promptly return it to you.