And here is another example i found; again, I could be mis-reading this but it looks to me like this modern amp can't meet its rated output without clipping the signal:
S&V TestYamaha RX-V863 A/V receiver
Rated: • 7 x 105 wattsTest Report
(continued)
By Daniel Kumin
September 2008
DOLBY DIGITAL PERFORMANCE
All data were obtained from various test DVDs using 16-bit dithered test signals, which set limits on measured distorting 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 are worst-case figures where applicable.
Output at clipping (1 kHz into 8/4 ohms)
1 channel driven: 77/111* W (18.9/20.5 dBW)
5 channels driven (8 ohms): 45 W (16.5 dBW)
6 channels driven (8 ohms): 41 W (16.1 dBW)
Distortion at 1 watt (THD+N, 1 kHz)
8/4 ohms: 0.05/0.05%
Noise level (A-wtd): -71.8 dB
Excess noise (with sine tone)
16-bit (EN16): 0.6 dB
Frequency response: 20 Hz to 20 kHz +0, -0.1 dB
* Speaker-impedance setup software-switch at "8-ohm" position. With switch set to "6-ohm," output was limited to about 35 watts (15.4 dBW) in all tests.
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): 0.03%
Noise level (A-wtd.): -85.3
Frequency response: <10 Hz to 138 kHz +0, -3 dB
STEREO PERFORMANCE, DIGITAL INPUT
Reference level is -20 dBFS; all level trims at zero. Volume setting for reference level was -3.5.
Output at clipping (1 kHz, 8/4 ohms, both channels driven): 66/97 W* (18.2/19.9 dBW)*
Distortion at reference level: 0.04%
Linearity error (at -90 dBFS): 1.5 dB
Noise level (A-wtd): -76.4 dB
with 96-kHz/24-bit signals: -80.5 dB
Excess noise (with/without sine tone)
16-bit (EN16): 0.35/0.5 dB
quasi-20-bit (EN20): 12.5/10.1 dB
Noise modulation: 3.3 dB
Frequency response: 20 Hz to 20 kHz +0, -0.2 dB
with 96-kHz/24-bit signals: 20 Hz to 43 kHz +0 -3 dB
*Speaker-impedance setup software-switch at "8-ohm" position. With switch set to "6-ohm," output was limited to about 35 watts (15.4 dBW) in all tests.
