High-end Class A headphone amplifier / DAC offering multiple analogue & digital inputs, selectable outputs & impedances, premium build and state-of-the-art converter technology.
Features
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Pure analogue Class-A output stages (MOSFET based), no op-amps or chips in the final stage. T+A+1
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Adjustable output impedance settings per headphone output (6 settings: 8, 12, 18, 25, 40, 80 Ohms) to better match different headphone loads. Upscale Audio+3T+A+3Hi-Fi Choice+3
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Three headphone output connectors:
  • 6.3 mm standard jack T+A+2Hi-Fi Choice+2
  • 4.4 mm Pentaconn balanced jack T+A+2Hi-Fi Choice+2
  • 4-pin XLR balanced output T+A+2Hi-Fi Choice+2 -
Numerous digital inputs: USB-B (high resolution), AES/EBU, BNC, Coaxial (2x), Optical (2x) SPDIF. T+A+2Hi-Fi Choice+2
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Optional HDMI module board: 2 HDMI IN, 1 HDMI OUT with ARC for LPCM stereo. Hi-Fi Choice+2Upscale Audio+2
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Bluetooth input: supports aptX HD, SBC, AAC etc. T+A+2Hi-Fi Choice+2
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DAC capabilities:
  • PCM up to 32-bit / 768 kHz T+A+2Hi-Fi Choice+2
  • DSD up to DSD1024 (native bitstream) T+A+2Hi-Fi Choice+2 -
Upsampling / filter options: several selectable oversampling / upsampling algorithms (e.g. FIR short, FIR long, Bezier/IIR, Bezier, NOS / non-oversampling) and analogue filter (phase-linear Bessel filter, 3rd order) with switchable cutoff (60 kHz or 120 kHz). T+A+2Hi-Fi Choice+2
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Sound / tone controls: Bass / treble adjustments, loudness switchable / adjustable, crossfeed function on request, output impedance and loudness settings. T+A+1
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Display & meters: Large front display showing input source, data rate, volume; twin VU-meters (Quasi Peak Programme Meter) for each channel; adjustable brightness & color. T+A+1
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Build quality & design: Solid machined aluminium front panel and case, extruded heatsinks/sides, non-magnetic aluminium plates; dual toroidal transformers (one for analogue section, one for digital). T+A+1
Technical Specifications
| Spec | Value |
|---|---|
| Frequency response (Analogue) | +0 / –3 dB from ~0.1 Hz to 200 kHz HiFi Knights+2T+A+2 |
| Signal-to-Noise Ratio | ~110 / 114 dB (depending on measurement/section) T+A+2House Of Stereo+2 |
| THD / IMD | < 0.001 % / < 0.001 % T+A+2House Of Stereo+2 |
| Channel Separation | >108 dB T+A+2House Of Stereo+2 |
| Power / Current in Class A | Up to ~700 mA T+A+1 |
| Power Output (into headphones) | Depending on impedance; lab report shows ~1,650 mW into 32 Ω, ~1,160 mW into 8 Ω (8 Ω setting) at 1 % THD. Hi-Fi News |
| Digital Section | Separate PCM & DSD signal paths Hi-Fi Choice+1 |
| Upsampling / Filters | FIR short / FIR long / Bezier / Bezier-IIR / NOS T+A+1 |
| Analogue Inputs | RCA (single-ended), Balanced XLR T+A+1 |
| Headphone Outputs | 6.3 mm single-ended jack; 4.4 mm Pentaconn balanced; 4-pin XLR balanced T+A+1 |
| Output Impedances Available | 8, 12, 18, 25, 40, 80 Ohm selections T+A+2Hi-Fi Choice+2 |
| Dimensions (W × H × D) | ~32 × 10 × 34 cm T+A+2HiFi Knights+2 |
| Weight | ~6.5 kg (≈14.4 lbs) T+A+1 |
| Power Requirements / Consumption | Mains 100-120 V or 200-240 V, 50-60 Hz; 100 W typical; <0.5 W in standby. Lab report measured ~40 W (active?) under certain conditions. |
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