Shure A15BT Bridging Transformer

The A15BT matches, bridges, or isolates balanced and unbalanced devices of different impedances and levels.

Impedance: XLR socket (Female), 33,000 Ω. XLR plug (Male), 7500 Ω, easily converted to 600 Ω.

Unbalancing: Either end can be unbalanced by connecting pins 1 and 3.

Voltage difference: From 33,000 Ω to 7500 Ω, 6.4 dB. From 33,000 Ω to 600 Ω, 17.4 dB.