Copland CSA150 Integrated Amplifier Lab Report

Lab Report

Comparing this 150W/8ohm-rated CSA150 with the 100W/8ohm CSA100 [HFN Aug '20] is instructive because the former behaves almost exactly like the latter except for an uplift in continuous power output. So, where the CSA100 offered 2x125W/8ohm and 2x193W/4ohm, the flagship CSA150 delivers 2x175W/8ohm and 2x270W/4ohm. However, the PSU has proportionally less headroom so its dynamic output of 184W, 341W, 570W and 767W into 8, 4, 2 and 1ohm [see Graph 1] is not appreciably higher than the 174W, 320W, 527W and 715W, respectively, offered by the CSA100. The trend of distortion – still largely 2nd harmonic – also increases uniformly with power output through the midrange from 0.003%/1W, 0.008%/10W, 0.03%/100W and 0.04% at the rated 150W (all 1kHz/8ohm) although, at very high frequencies, it's a consistent ~0.04%/20kHz (1-100W). As we saw with the CSA100, the CSA150's A-wtd S/N is a below-average 80dB (re. 0dBW) but this is still a pleasing white noise rather than hum or buzz. The (analogue) response remains flat and extended from +0.0dB/5Hz to –0.25dB/20kHz and –2.7dB/100kHz while the main/preamp outputs are still phase inverting.

Measured via the non-inverting tape loop, a 0dBFs digital input yields a 2.08V output, the ESS9018S-based DAC stage offering a 103dB A-wtd S/N ratio and minimum 0.0011% THD over the top 20dB of its dynamic range [see Graph 2]. Jitter is suppressed to an impressive ~30psec via all sample rates while the 82dB stopband rejection, ringing on transients, and response(s) are all defined by the default linear phase digital filter. The responses reach to –0.04dB/20kHz, –0.7dB/45kHz and –2.3dB/90kHz with 48kHz, 96kHz and 192kHz digital files. PM


Dynamic power output versus distortion into 8ohm (black trace), 4ohm (red), 2ohm (blue) and 1ohm (green) speaker loads. Max. current is 27.7A


Distortion versus 48kHz/24-bit digital signal level over a 120dB range (1kHz, black; 20kHz, blue)

Continuous power (<1% THD, 8/4ohm) 175W / 270W
Dynamic power (<1% THD, 8/4/2/1ohm) 184W / 341W / 570W / 767W
Output imp. (20Hz–20kHz, Pre/Amp) 192ohm / 0.027-0.055ohm
Freq. resp. (20Hz–20kHz/100kHz) +0.00 to –0.25dB/–2.7dB
Digital jitter (USB / S/PDIF) 29psec / 33psec
A-wtd S/N ratio (DAC/Amp) 103.4dB (0dBFs) / 80.1dB (0dBW)
Distortion (DAC, 0dBFs/Amp, 0dBW) 0.0017-0.027% / 0.0014-0.041%
Power consumption (idle/rated o/p) 42W / 550W (1W standby)
Dimensions (WHD, each unit) 435x164x370mm / 15kg
Price £4988 (+£198 Bluetooth module)

Copenhagen, Denmark
Supplied by: Absolute Sounds Ltd
0208 971 3909