Test Bench: Yamaha RX-V661 A/V Receiver

DOLBY DIGITAL PERFORMANCE

All data were obtained from various test DVDs using 16-bit dithered test signals, which set limits on measured distortion and noise performance. Reference input level is -20 dBFS, and reference output is 1 watt into 8 ohms. Volume setting for reference level was -3. All level trims at zero, except for subwoofer-related tests; all speakers were set to "large," subwoofer on. All figures are worst-case where applicable.

Output at clipping (1 kHz into 8/4 ohms) 1 channel driven: 151/224 watts* (21.8/23.5 dBW)* 5 channels driven (8 ohms): 56 watts (17.5 dBW) 6 channels driven (8 ohms): 53 watts (17.2 dBW) Distortion at 1 watt (THD+N, 1 kHz) 8/4 ohms: 0.03/0.04% Noise level (A-weighted): -76.3 dB Excess noise (with sine tone) 16-bit (EN16): 0.9 dB Frequency response: 20 Hz to 20 kHz +0, -0.15 dB

*Speaker-impedance setup switch at "8-ohm" position. With switch set to "6-ohm," output was limited to about 63 watts (18 dBW).

MULTICHANNEL PERFORMANCE, ANALOG INPUT

Reference input and output level is 200 mV; volume setting for reference output level was -3.5 dB.

Distortion (THD+N, 1 kHz, 8 ohms): 0.01% Noise level (A-weighted): -92.8 dB Frequency response: <10 Hz to 133 kHz +0, -3 dB

STEREO PERFORMANCE, DIGITAL INPUT

Reference level is -20 dBFS; all level trims at zero. Volume setting for reference level was -3 dB.

Output at clipping (1 kHz, 8/4 ohms, both channels driven): 99/137 watts* (20/21.4 dBW)* Distortion at reference level: 0.03% Linearity error (at -90 dBFS): 1.3 dB Noise level (A-weighted): -76 dB with 96-kHz/24-bit signals: -84.3 dB Excess noise (with/without sine tone) 16-bit (EN16): 0.8/0.25 dB quasi-20-bit (EN20): 12.2/11.7 dB Noise modulation: 1.3 dB Frequency response: 20 Hz to 20 kHz +0, -0.1 dB with 96-kHz/24-bit signals: 20 Hz to 43 kHz +0, -3 dB

*Speaker-impedance setup switch at "8-ohm" position. With switch set to "6-ohm," output was limited to about 61 watts (17.9 dBW).

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