T+A PSD 3100 HV Streaming DAC/Preamp Lab Report

Lab Report

With a peak level (0dBFs) digital input the PSD 3100 HV will offer a substantial 18.9V balanced output at full '99' volume, however distortion is just shy of clipping at 0.8% and only settles back to a consistent 0.0014%/1kHz at volume settings of '89' and lower. This represents a 'standard' 6V balanced output from a 23ohm impedance where distortion holds to 0.0014-0.0017% (20Hz-20kHz) and falls to a low 0.00013-0.0004% over the top 20dB of its dynamic range [see Graph 1, below]. The A-wtd S/N ratio is a respectable 114.8dB (for double-differential PCM1795 DACs) while jitter is held to a low ~10psec over all sample rates.

The six in-house upsampling filters use the latest coefficients last seen in the DAC 200 [HFN May '22]. FIR Long and Short are linear-phase types while the Bezier polynomials are minimum-phase filters. FIR Long [black traces, Graph 2] trades (unnatural) extended pre/post ringing for low phase distortion, a comprehensive 102dB rejection of aliasing images, and flat responses that reach out to –0.0dB/20kHz, –1.0dB/45kHz and –3.7dB/90kHz with 48kHz, 96kHz and 192kHz media, respectively. 'FIR Short' [red] has much reduced pre/post-ringing but also a very limited 7.4dB rejection of out-of-band images and a steep treble roll-off of –3.6dB/20kHz. The mixed 'Bezier/IIR' interpolation filter [cyan] behaves like a slow roll-off minimum phase filter with no better suppression of stopband images than FIR Short, slightly increased phase distortion and a +0.8dB/13kHz treble peak. The NOS (non-oversampling) modes 1 and 2 [green traces, Graph 2] offer almost perfect time domain behaviour – no ringing – but a rolled-off treble of –3.5dB and –3.2dB/20kHz, respectively, with CD/48kHz media. PM


THD vs. 48kHz/24-bit digital signal level over a 120dB dynamic range (1kHz, black; 20kHz, blue)


Impulse and frequency responses (1kHz-20kHz) with 48kHz data (FIR Long, black; FIR Short, red; Bezier/IIR, cyan; NOS 2, green)

Maximum output level / Impedance 5.98Vrms / 23ohm (XLR out)
A-wtd S/N ratio (Network / USB) 114.8dB / 114.9dB
Distortion (1kHz, 0dBFs/–30dBFs) 0.0014% / 0.0003%
Distortion & Noise (20kHz, 0dBFs/–30dBFs) 0.0017% / 0.002%
Freq. resp. (20Hz-20kHz/45kHz/90kHz) +0.0 to –0.0dB/–1.0dB/–3.7dB
Digital jitter (48kHz / 96kHz / 192kHz) 9psec / 10psec / 10psec
Resolution (1kHz @ –100dBFs/–110dBFs) ±0.1dB / ±0.5dB
Power consumption (Analogue/Dig PSU) 16W / 7W
Dimensions (WHD) / Weight 460x170x460mm / 26kg
Price £14,900

T+A elektroakustik GmbH & Co. KG
Supplied by: Kog Audio, Coventry, UK
024 7722 0650