The Solo Ultra-Linear Diamond Edition (ULDE) headphone amplifier replicates tube amplification but is solid-state to keep its performance for all its long life.
So what about tubes does it replicate? It replicates the most important difference between tubes and solid-state, that tubes give a flatter open-loop frequency response which extends into the mid frequencies before negative feedback is applied. It means that when it’s applied to keep distortion low, it is true 180° negative feedback, and it gives a wholesome sound that otherwise is sadly lacking in solid-state.
The Solo ULDE has a completely redesigned output stage and better noise performance than the earlier Solo UL, which means it will drive a much greater range of high-performance over-ear dynamic headphones, and be hiss-free when used with in-ear monitors.
Unlike tube amplifiers, it works with all common headphone impedances, and its Z-Match impedance ranging volume control takes the place of gain switches, allowing amplifier gain to be fixed so it results in optimum musical performance.
Excellent power supply filtering and ultra-stable voltage regulation make its power so clean that it depicts the minutest of detail, the nuances – the shades of expression, so your music really communicates with you.
Solo Ultra-Linear Specifications
- Headphone impedance range: 8 to 2,000 Ohms / 16 to 600 Ohms preferred
- Power output (rms, both channels fully driven at 1% THD): 32 Ohms: 140mW/channel; 600 Ohms: 30mW/channel
- Input sensitivity: (for specified power output into 32 Ohms) 511mV rms
- Input impedance: 37k Ohms at max volume; 50k Ohms at min volume
- Distortion (THD plus noise at 9 o’clock volume control setting (qtr power)): 10Hz-20kHz: better than 0.04%; 10Hz-1kHz: better than 0.02%
- Frequency response (±0,-3dB): 10Hz – 35kHz
- Output noise (22Hz-22kHz, quasi-peak/un-weighted): -95dB
- Channel balance: better than 1dB
- Crosstalk: Left to Right -56dB; Input to Input -68dB
- Input selector centre-off position: non-shorting; -38dB at max volume with 2V rms input (ref: 1kHz and 10kHz)
- Output Stage: Bipolar class AB
- Supply voltage: 24V DC unipolar
- Size (approx.): W: 107 x H: 50 x D: 185 (mm) inc. controls
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