Cambridge Audio Azur 751R A/V Receiver HT Labs Measures

HT Labs Measures

Two channels driven continuously into 8-ohm loads:
0.1% distortion at 187.2 watts
1% distortion at 212.1 watts

Five channels driven continuously into 8-ohm loads:
0.1% distortion at 121.9 watts
1% distortion at 144.5 watts

Seven channels driven continuously into 8-ohm loads:
0.1% distortion at 117.0 watts
1% distortion at 136.7 watts

Analog frequency response in Stereo Direct mode:
–0.24 dB at 10 Hz
–0.08 dB at 20 Hz
–0.15 dB at 20 kHz
–4.36 dB at 50 kHz

Analog frequency response with signal processing:
+0.36 dB at 10 Hz
+0.12 dB at 20 Hz
+0.06 dB at 20 kHz
–17.78 dB at 50 kHz

This graph shows that the 751R’s left channel, from BD input to speaker output with two channels driving 8-ohm loads, reaches 0.1 percent distortion at 187.2 watts and 1 percent distortion at 212.1 watts. Into 4 ohms, the amplifier reaches 0.1 percent distortion at 246.9 watts and 1 percent distortion at 314.3 watts.

Response from the multichannel input to the speaker output measures –0.25 decibels at 10 hertz, –0.09 dB at 20 Hz, –0.20 dB at 20 kilohertzz, and –4.31 dB at 50 kHz. THD+N from the BD input to the speaker output was less than 0.026 percent at 1 kHz when driving 2.83 volts into an 8-ohm load. Crosstalk at 1 kHz driving 2.83 volts into an 8-ohm load was –77.45 dB left to right and –90.75 dB right to left. The signal-to-noise ratio with an 8-ohm load from 10 Hz to 24 kHz with “A” weighting was –104.71 dBrA.

From the Dolby Digital input to the loudspeaker output, the left channel measures +0.14 dB at 20 Hz and +0.07 dB at 20 kHz. The center channel measures +0.13 dB at 20 Hz and +0.07 dB at 20 kHz, and the left surround channel measures +0.13 dB at 20 Hz and +0.06 dB at 20 kHz. From the Dolby Digital input to the line-level output, the LFE channel is +0.61 dB at 20 Hz when referenced to the level at 40 Hz and reaches the upper 3-dB down point at 67 Hz and the upper 6-dB down point at 82 Hz.—MJP

Video Test Bench
The Azur 751R, with its Anchor Bay ABT 2010 processor, passed all of our video processing tests, though its response on the top burst of the horizontal Chroma Resolution test was borderline. Some chroma rolloff at this frequency is often designed into HDTVs for defendable technical reasons, and the Sony VPL-55W900A LCD HDTV used for the test (review upcoming) has a mild chroma rolloff of its own. The Cambridge added to it, but the resolution lines could still be seen from relatively close to the screen. While the Cambridge passed our 2:2 HD test, it had to relock on the signal with each repetitive run of the source material.—TJN

COMPANY INFO
Cambridge Audio
(800) 663-9352
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