Shure A95UF User Manual

Model A95UF

User Guide

MODEL A95UF LINE MATCHING TRANSFORMER

The Shure Model A95UF is a reversible line matching transformer that can match
low impedance microphones to high impedance inputs, or match high impedance
microphones to low impedance inputs. The A95UF lets you use long runs of cable
with either low impedance or high impedance microphones. However, when con­necting the high impedance end of the A95UF to a high impedance microphone,
the cable should be no more than 4.6 m (15 ft.) long. The A95UF prevents high fre­quency attenuation, level loss, and pickup of noise or hum.

The A95UF can be configured for two low impedance settings: 19Ω to 75Ω, or 75Ω
to 300Ω. As supplied, the low impedance end is configured for 75Ω to 300Ω.

The A95UF is furnished with a female XLR connector at the low impedance end,
and a standard 1/4-inch phone plug and a phone jack adapter at the high
impedance end.

LOW IMPEDANCE SELECTION

As supplied, the low impedance end of the A95UF is configured for use with inputs
rated at 75Ω to 300Ω. To reconfigure the low impedance end for inputs rated at
19Ω to 75Ω, refer to the figure below and proceed as follows:

1. Remove the low-impedance plug element by turning the screw counter­clockwise and withdrawing the element from the case.

2. Unsolder the YELLOW lead from pin 3 and insulate the bare wire at the
end of the lead with the insulator from the ORANGE lead.

3. Solder the ORANGE lead to pin 3.

4. Rotate the plug element three turns to twist the leads, and replace the
element in the housing. Reinstall the screw by turning it clockwise.

©2009 Shure Incorporated
27D1926 (Rev. 3)

Printed in U.S.A.

IMPEDANCE

BLACK

2

1

GREEN

3

ORANGE

GREEN/ORANGE 19-75Ω

GREEN/YELLOW 75-300Ω

BLACK/RED HIGH

SLEEVE

TIP

YELLOW

RED

SPECIFICATIONS

Frequency Response

20 Hz to 20 kHz. Response at 20 Hz no more than 3 dB down from flat.

Impedance

Green/Orange winding: Low Z (19 to 75Ω)
Green/Yellow winding: Low Z (75 to 300Ω)
Black/Red winding: High Z (41,000Ω)

DC Resistance

Green/Orange winding: 37.5Ω
Green/Yellow winding: 75Ω
Black/Red winding: 4300Ω

Voltage Ratio

Low to High Impedance: +28 dB at 19Ω to 75Ω

High to Low Impedance: -28 dB at 19Ω to 75Ω

+22 dB at 75Ω to 300Ω

-28 dB at 75Ω to 300Ω