Shure A95U User Manual
Model A95U
User Guide
MODEL A95U LINE MATCHING TRANSFORMER
This reversible transformer matches low- or high-impedance microphones to
high- or low-impedance inputs. The transformer permits use of very long microphone cables with either low- or high-impedance microphones. However, when
connecting a high-impedance microphone, limit the cable length between the microphone and the transformer to 4.6 m (15 ft). The cable from the transformer to
the low-impedance input can be any desired length.
The transformer prevents high-frequency loss, level loss, and pickup of noise
and hum. The A95U comes furnished with a three-pin XLR connector on the
low-impedance end, with a 1/4 in. phone plug and phone jack adapter on the
high-impedance end.
Case
Full magnetic shield, steel with gray enamel finish
Dimensions
19 mm (3/4 in.) diameter; 89 mm (31/2 in.) long without adapters
LOW-IMPEDANCE SELECTION
The A95U comes factory preset with the low-impedance end intended for use
with microphones or inputs rated 75 to 300 ohms. For microphones or input rated
at 19 to 75 ohms, make the following changes.
1. Remove the low-impedance XLR plug by turning the lock screw counter-
clockwise and withdrawing the XLR plug from the case.
©2009 Shure Incorporated
27C1925 (Rev. 5)
Printed in U.S.A.
2. Unsolder the YELLOW lead from pin 3 and insulate the bare wire at the end of
YELLOW
BLACK
3
2
1
SLEEVE
TIP
ORANGE
GREEN
RED
HIGH IMPEDANCELOW IMPEDANCE
IMPEDANCES
GREN/YLW 75–300
Ω
GREN/ORN 19–75
Ω
BLK/RED HIGH
the lead with the insulator from the ORANGE lead.
3. Solder the ORANGE lead to pin 3.
4. Rotate the XLR plug three turns to twist the leads, then replace the XLR plug
in the case. Tighten the lock screw to secure the XLR plug in place (turning
clockwise).
SPECIFICATIONS
Frequency Response
Impedance
Flat, 20 Hz to 20 kHz. Response at 20 Hz no more than 3 dB down from flat.
Low impedance: 75 to 300 Ω (supplied) or 19 to 75 Ω
Medium impedance: High (41 kΩ with 150-Ω source
on 75-to-300 Ω winding.)
2
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