Pathos InPol Ear Reference Headphone Amplifier

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.

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.

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)
THD: 0.1% @ 11 W
S/N Ratio: > 100 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): 11" x 14.56" x 7"
Weight:  27.5 lb (12.5 kg)