Model A15BT User Guide
BRIDGING TRANSFORMER
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.
2.
3.
4.
Remove the three-pin plug element by turning the screw counterclock-wise and
withdrawing the element from the case.
Remove the GREEN lead pin jack from pin 3, and insulate the jack and bare
lead.
Remove the tape from the pin jack on the WHITE lead and push the jack firmly
onto pin 3.
Replace the plug element in the housing and fasten the screw firmly in place
(turn clockwise).
©2009 Shure Incorporated
27C1916 (Rev. 5)
Printed in U.S.A.
Impedance
XLR Pin Connector (M):
XLR Socket Connector (F):
Voltage Ratio
7500Ω or 600Ω
33,000Ω
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
Impedance (ohms)
Winding Being
Driven (ohms)
600
Maximum
Level (Volts)
0.5
600
600
600
7,500
2.5
6.0
1.5
5.0
5.0
33,000
7,500
7,500
7,500
33,000
Case
33,000
33,000
Full magnetic shield, steel with gray enamel finish
Dimensions
19 mm (3/4 in.) diameter; 89 mm (3 1/2 in.) long
CONNECTOR WIRING DIAGRAM
GROUND
GROUND
TERMINAL
BLUE
YELLOW
TERMINAL
SNAP
RING
2
2
600
Ω
3
3
BLACK
WHITE
GREEN
7500
Ω
33K Ω
1
1
FEMALE
INSERT
MALE
INSERT
RED
TRANSFORMER
BLACK
LIMITED WARRANTY
Shure Incorporated (“Shure”) hereby warrants to the original consumer purchaser only that this product will be
free in normal use of any defects in materials and workmanship for a period of two (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. In order for this warranty to be valid, the consumer
must, at the time the product is returned, provide proof of purchase in the form of the original purchase receipt
directly from Shure or from a Shure-authorized reseller. If Shure elects to replace the defective product, then Shure
reserves the right to replace the defective product with another product of the same model or a model of at least
comparable quality and features in Shure’s sole determination.
If you believe this product is defective within the warranty period, carefully repack the unit, insure it and return it
with proof of purchase, postage prepaid, to Shure Incorporated, Attention: Service Department, at the address
below.
Outside of the United States, return the product to your dealer or Authorized Service Center. Addresses are listed
This warranty is not transferable. This warranty does not apply in cases of abuse or misuse of the product, use
contrary to Shure’s instruction, ordinary wear and tear, an act of God, negligent use, purchase from a party other
than Shure or a Shure-authorized reseller, unauthorized repair, or modification of the product.
ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE
HEREBY DISCLAIMED TO THE EXTENT PERMITTED UNDER APPLICABLE LAWS AND, TO THE EXTENT
NOT PERMITTED, ARE HEREBY LIMITED TO THE DURATION AND TERMS OF THIS WARRANTY. SHURE
ALSO HEREBY DISCLAIMS ALL LIABILITY FOR INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES.
Some states do not allow limitations on how long an implied warranty lasts, or the exclusion or limitation of inciden-
tal or consequential damages, so the above limitation may not apply to you. This warranty gives you specific legal
rights, and you may have other rights which vary from state to state.
This warranty does not restrict the rights of the consumer mandated under applicable laws.
THIS WARRANTY SUPERSEDES ALL OTHER WARRANTIES THAT ARE ASSOCIATED OR INCLUDED WITH
THIS PRODUCT.
Shure Incorporated
United States, Canada, Latin America, Caribbean:
5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A.
Phone: 847-600-2000 U.S. Fax: 847-600-1212 Int’l Fax: 847-600-6446
Europe, Middle East, Africa:
Attention: Service Department
5800 W. Touhy Avenue
Niles, IL 60714-4608 U.S.A.
Shure Europe GmbH, Phone: 49-7131-72140 Fax: 49-7131-721414
Asia, Pacific:
Shure Asia Limited, Phone: 852-2893-4290 Fax: 852-2893-4055
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