Whirlwind ISO1 Line Level Audio Isolation TransformerIsolate and Balance Audio Signals with Precision The Whirlwind ISO1 is a high quality line level audio transformer designed to eliminate ground loops and balance audio signals. Ideal for console outputs, amplifier inputs, and any line level signal, it provides transformer isolation and ground lifting to eliminate buzz and hum. Type: 1 channel Line Isolator Transformer: Whirlwind TRSP 600L Frequency Response: 1 dB from 20 Hz to 20 kHz at +20 dBm input