Shure A85F XLR to 1/4" Impedance Matching Transformer

The Shure A85F is a passive impedance matching transformer designed to solve one of the most common connectivity challenges in audio production: bridging balanced low-impedance microphone outputs with unbalanced high-impedance inputs. Whether you are connecting a professional XLR microphone to a vintage guitar amplifier, an older mixing console with only 1/4-inch inputs, or a portable recorder lacking XLR connectivity, the A85F handles the conversion cleanly while boosting the signal by 24dB. This gain compensation is critical because impedance mismatches typically result in significant signal loss, and the A85F restores proper operating levels without introducing electronic noise or requiring any power source.

The reversible design adds genuine versatility — the same unit works in both directions, accommodating workflows where you need to go from a 1/4-inch unbalanced source into a balanced XLR input. At just 1.6 ounces, the A85F is small enough to keep permanently in a gig bag or tool kit without notice. The female XLR connector accepts standard microphone cables directly, while the male 1/4-inch phone plug inserts into equipment inputs with a secure fit. As a passive device with no active electronics, it provides natural galvanic isolation between connected equipment, which can help eliminate ground loop hum in certain setups. For audio professionals and enthusiasts who encounter mixed-impedance gear, the A85F is the kind of simple, well-built adapter that quietly solves problems for years without ever needing attention.