General Description

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.
  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 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).
    GREN/YLW 75-300 Ω
    GREN/ORN 19 - 75 Ω

Frequency Response

20 to 20 kHz


Low Impedance 75 to 300 Ω