Transformer; Low Z, Female XLR to High Z 1/4" Phone Plug

The Shure A85F is a line‑matching transformer designed to connect a balanced, low‑impedance microphone output to an unbalanced, high‑impedance input. It allows professional microphones with XLR connectors to be used with equipment that only has unbalanced high‑impedance inputs, such as guitar amplifiers, effect pedals, older audio gear, or other ¼‑inch jack inputs. The A85F provides a voltage gain to help maintain proper signal level and operates passively (no external power required) inside a rugged, compact, shielded metal housing.

Features

• Line matching transformer for microphone to high‑impedance connections

• Converts balanced low‑impedance output to unbalanced high‑impedance input

• +24 dB voltage gain to increase signal level when needed

• Balanced female XLR input

• Unbalanced ¼″ (6.3 mm) TS male output

• Passive operation (no batteries or external power)

• Impedance matching from low‑Z (approx. 75–300 Ω) to high‑Z

• Frequency response suitable for full audio range (approx. 20 Hz – 20 kHz)

• Durable, shielded metal enclosure for reliability

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