The Whirlwind ISO1 is a high quality line level audio transformer device. Use it on console outputs, amplifier input feeds or any line level signal for transformer isolation and ground lifting to overcome buzz and hum problems. Use it as a balancer to convert between balanced XLR and unbalanced 1/4” signals. The ISO1 uses Whirlwind's TRSP- 600L transformer with a frequency response of ±1 dB from 20 to 20 kHz at +20 dBm input level.