T+A DAC 200/A 200 DAC/Preamp & Power Amp Lab Report

Lab Report

Rated at 125W/8ohm, the A 200 romps home with 145W/8ohm and 285W/4ohm although, as the dynamic profile illustrates [Graph 1], there's a jump in distortion from a very low 0.0005%/1kHz at 1W-110W to 0.3%/115W, 0.5%/120W and finally 1% THD at 145W. The Class D architecture dictates that continuous and dynamic power is almost identical – 146W, 289W, 290W and 152W into 8, 4, 2 and 1ohm loads, respectively, limited to ~12A into low impedances. Distortion also increases with frequency although a figure of 0.01%/20kHz (re. 10W) is still low – all courtesy of the Purifi Eigentakt Class D modules [see NAD M33, HFN Aug '20]. This advanced amplifier module also delivers the load-independent ±0.15dB/20Hz-20kHz frequency response and wide 88.4dB A-wtd S/N ratio (re. 0dBW) that sets the A 200, and other 'Eigentakt adoptees', above the standard Class D pack. The switchable DF (damping factor/output impedance) is a T+A 'feature' however – from 0.023ohm (low) to 0.12ohm (high).

Meanwhile, the DAC 200 – sharing its digital 'heart' with the HA 200 [HFN Aug '20] – offers a huge 15.2V max. output (XLR), albeit achieved at '–2' on the volume scale with a peak level 0dBFs input (the output is clipped at higher volume). The A-wtd S/N ratio reaches 116dB here, with distortion peaking at 0.0029-0.0034% (20Hz-20kHz) before falling back to a minimum of 0.00012-0.00035% over the top 20dB of its dynamic range [see Graph 2]. Low-level linearity holds good to within ±0.1dB over a full 110dB dynamic range while jitter, with the 'local oscillator' engaged, is fully suppressed to ~10psec across all inputs and sample rates. I discuss the impact of the six digital filter modes on time domain and frequency response in our Consonant Coefficients sidebar. PM


Dynamic power output versus distortion into 8ohm (black trace), 4ohm (red), 2ohm (blue) and 1ohm (green) speaker loads. Max. current is 12.3A


Distortion versus 24-bit digital signal level over a 120dB range (1kHz, black; 20kHz, blue)

Continuous power (<1% THD, 8/4ohm) 145W / 285W
Dynamic power (<1% THD, 8/4/2/1ohm) 146W / 289W / 290W / 152W
Output imp. (20Hz–20kHz, Pre/Amp) 22ohm / 0.023-0.024ohm
Freq. resp. (20Hz–20kHz/100kHz) +0.0 to –0.15dB/–12.2dB
Digital jitter (USB / S/PDIF) 11psec / 10psec (48kHz/24-bit)
A-wtd S/N ratio (DAC/Amp) 116.1dB (0dBFs) / 88.4dB (0dBW)
Distortion (DAC, 0dBFs/Amp, 0dBW) 0.0009-0.001%/0.0005-0.0025%
Power consumption (Preamp/Amp) 20W / 280W (20W idle)
Dimensions (WHD) 320x100x340mm (each)
Price £4990 (DAC 200)/£3490 (A 200)

T+A elektroakustik GmbH & Co. KG
Supplied by: The Audio Business Ltd, Wilts, UK
01225 704669