ALO Audio Rx Mk3 Balanced Headphone Amp

A major revision update to the Rx Mk II, the Rx MkIII now supports balanced input and balanced output. In addition a Bass control knob is added to the feature list. This powerful amp is well suited for the hard-to-drive headphones such as the Hifiman series, Senn HD800's, Audeze LCD's. From the ALO page :- Features: - Unique bass adjustment - Custom machined knobs for precision control - 4 color illuminated indicator light - 3 position gain switch for ultimate volume control - Balanced input and output - Single-Ended input and output - 10 hours of battery life in Fully-Balanced mode. - 12-14 hours of battery life in Single-Ended mode - Available in anodized black (Silver at the end of May '12) Specifications: Battery: Battery4400 mAh Lithium-Polymer Battery Play Time: Play Time10 – 14 hours Battery Recharge Time: Recharge Time3 hours Frequency Response : +/- 1 dB:5 Hz - 80 kHz Output Power - Balanced: 150 mW into 300 ohms 630 mW into 50 ohms 640 mW into 32 ohms 80 mW into 600 ohms Output Power - Unbalanced: 20 mW into 600 ohms 220 mW into 50 ohms 320 mW into 32 ohms 40 mW into 300 ohms High Gain Setting: Hi Gain12dB Medium Gain Setting: Med Gain3dB Low Gain Setting: Lo Gain-3dB Bass Adjustment: .5 dB @ 360 Hz 1 dB @ 260 Hz 2 dB @ 160 Hz 3 dB @ 80 Hz 3.5 dB @ < 40 Hz < .5 dB @ > 360 Hz