Pathos InPol Ear Reference Headphone Amplifier

Pathos InPol Ear Reference Headphone Amplifier “Insanely great.” — STEVE GUTTENBERG, AUDIOPHILIAC A class-A hybrid with two Electro-Harmonix 6922's and Pathos' InPol circuit InPol Ear is a pure class-A integrated headphone amplifier, with a fully balanced latest generation double InPol. It features two balanced and one unbalanced output and allows the addition of the HiDac Mk2 converter. The balanced output offers 10 W into 16 Ohm, and the single-ended, 6 W into 16 Ohm. InPol (Inseguitore Pompa Lineare - Linear Pump Follower) is a Pathos patented system that allows for much greater output in pure Class A. This fully balanced circuit design uses a single solid-state component in follower configuration, with a high-current gain and voltage gain together. Think of the directness of SET with the control and damping of solid-state. InPol technology allows the tube input stage to effectively drive your speakers with no further amplification.  An optional HiDac Mk2 converter offers a high-quality onboard DAC with digital inputs.  The InPol Ear has Pathos' eye-catching (and highly effective) logo-shaped heatsinks, and comes in a range of center panel options. "The only thing I regret is not having bought this amplifier 3-4 years ago!!" Read the detailed, unsolicited customer reviews below. This amp is truly beloved, and always steals the show at our tables at CanJam or RMAF or Axpona. If you're not able to visit us, look out for the next show we're attending and bring your favorite headphones to listen to this Italian beauty! Specifications Type: Reference stereo integrated amplifier for headphones. Pure Class A double INPOL technology  Output Power (Unbalanced, Balanced) 32 Ω: 3 W, 10 W 50 Ω: 1.9 W, 6.4 W 120 Ω: 800 mW, 2.7 W 300 Ω: 320 mW, 1 W 600 Ω: 160 mW, 533 mW Tube Type: 2 x 6922 Electro-Harmonix Output Impedance (Unbalanced, Balanced): 0.45 Ohm, 0.9 Ohm Frequency Response: 2 Hz – 200 kHz ± 0.5 db Input Sensitivity: 2.2 V RMS Input Impedance: 100 kOhm Output Polarity: Selectable by remote control Volume Regulator: 2 x Burr Brown PGA2310 (180 steps 0.5 dB) Max Input Voltage: 4.4 V RMS Max Output Voltage (Unbalanced, Balanced): 10 V RMS, 20 V RMS Preamplifier Gain: 9 db Outputs: 1 x balanced XLR, 1 x RCA Connections Analog Line Inputs: 1 x balanced XLR, 4 x RCA  Digital Inputs (Optional HiDac Mk2 board required): 1 x USB B, 1 x S/PDIF coaxial, 1 x S/PDIF optical Outputs: 1 x pre out RCA (pre-output phase can be selected), 1 x pre out balanced XLR, 1 x 6.3 mm headphone, 2 x 4 pin XLR Power Consumption: 110 W Dimensions (WHD): 14.56" x 7" x 11"  Weight:  27.5 lb. (12.5 kg)