Sonic Frontiers Power 3 Tube Monoblocks Excellent Condition

Perfect operating condition, all tubes tested well and fully functional, well cared for, sparingly used. From the Stereophile Magazine review. The Sonic Frontiers Power 3 is an ambitious assault on the state of the art, and in most ways succeeds spectacularly, reflecting a sound, intelligent approach that combines well thought-out design and superb execution. It's incredibly well built, lavishly appointed, and reflects an attention to detail that's at the absolute top of the audio-or any other-craft.

The Owners Manual can easily be found in an online search. Tube complement (each monoblock): eight 6550C, four 6922, two 5687. Frequency response: 5Hz-75kHz, ±0.5dB at 1W; 15Hz-60kHz, ±0.5dB at 220W.

Input sensitivity for full output power: 2.2V, balanced or single-ended inputs. Voltage gain: 25.6dB into 8 ohms, 22.6dB into 4 ohms, 19.6dB into 2 ohms. Input impedance: 100k ohms single-ended, 200k ohms balanced. Output impedance: 0.25 ohms at 1kHz.

Damping factor: >50 (using IHF method from RS-490). Power consumption: 375W at idle, 580W at rated output. Dimensions: 18" (460mm) W by 9" (230mm) H by 22 (560mm) D. Net weight: 100 lbs (45kg) each.