The X-Amp employs unique Class A circuit topology optimised for use with guitars and giving optimal reach and frequency response. A balanced line input with LED indicator and level control is included as well as a transformer isolated output to eliminate hum and buzz caused by ground loops a 180 degree polarity reverse switch to bring both amps into phase and a dual ground lift switch for noise free operation. The Radial X-Amp is built to withstand years of trouble-free use with an internal I-beam skeleton providing maximum protection against external stresses. The innovative bookend design also creates a protective area around the switches potentiometer and connectors to give extra protection to the most vulnerable points. A whole bottom no-slip pad prevents vibrations and gives electrical and mechanical isolation. Specifications Audio circuit type: 100 discrete class-A Frequency response: 20Hz 15kHz (± 1.0dB) Signal to noise ratio: 88dB below instrument level (-20dBu) Dynamic range: 119dB Noise floor: OUT-1 -110dB; OUT-2 -108dBu Maximum input: +22dBu Total harmonic distortion: 0.02 @ -15dBu Inter-modulation distortion: 0.02 @ -20dBu Input impedance: 600? XLR input: Balanced line-level AES standard (pin-2 hot) Ground lift (input): Disconnects pin-1 at the XLR input Output level: Adjustable Output type: Out-1 direct Out-2 isolated Polarity: 180º polarity reverse on output-2 Power: +15VDC/400mA adapter included Construction: 14 gauge steel chassis & outer shell baked enamel finish Size: 3.3″ x 5.0″ x 2″ (84 x 127 x 48mm) Weight: 1.55lb (720g) Shipping Size: 5″ x 2.75″ x 10.75″ (127 x 70 x 273mm) Shipping Weight: 2.6lb (1.18kg) Warranty: Radial 3-year transferable