LAB REPORT

摘要

Levinson's 0-80 volume control (scaled in steps of 0.1 but not precisely ±0.1 dB) is accurate to ±0.5dB over the top 60dB of its dynamic range. The No585 is also very powerful, obliterating its 200W specification with a 2x285W/8ohm and 2x455W/ 4ohm performance, increasing to 355W, 635W, 988W and 1211W (～35A at ＜1% THD) into 8, 4, 2 and 1ohm loads under dynamic conditions [see Graph 1, below]. Distortion increases gently from 0.007%/1 W to 0.0256/100W and 0.03% at the rated 200W (all at 1 kHz) but also at very low frequencies - 0.05% at 20Hz and 2.5%/5Hz (10W/8ohm). The response is somewhat load-sensitive, extending down to -0.04dB/20Hz but varying at 20kHz from -0.1 dB, -0.25dB, -0.5dB and -1 dB into 8, 4, 2 and 1ohm. The S/N ratio is healthy at 89.4dB (re. 0dBW).