Arcam AVR750 AV Receiver Test Bench

Editors Note: Arcam’s published power specification for the AVR750 claims 100 watts per channel with all seven channels driven, at a specified total harmonic distortion of 0.2%, slightly higher than the 0.1% threshold at which we take our usual test bench measurments. This is reflected in the five- and seven-channel driven measurements below, which appear to deliver less than the specified 100 watts. At the higher 0.2% threshold, the AVR750 meets all of its published power ratings.— Rob Sabin

0.1% THD 1.0% THD
2 Channels Continuously Driven, 8 ohm loads: 132.0 watts 163.9 watts
5 Channels Continuously Driven, 8 ohm loads: 93.8 watts 124.7 watts
7 Channels Continuously Driven, 8 ohm loads: 86.1 watts 106.6 watts

Analog frequency response in Stereo Direct mode:
–0.04 dB at 10 Hz
–0.01 dB at 20 Hz
+0.04 dB at 20 kHz
–2.75 dB at 50 kHz

Analog frequency response with signal processing:
–0.51 dB at 10 Hz
–0.14 dB at 20 Hz
–0.17 dB at 20 kHz
–13.18 dB at 50 kHz

This graph shows that the AVR750’s left channel, from CD input to speaker output with two channels driving 8-ohm loads, reaches 0.1% distortion at 132.0 watts and 1% distortion at 163.9 watts. Into 4 ohms, the amplifier reaches 0.1% distortion at 200.7 watts and 1% distortion at 227.7 watts.

There was no multichannel input to measure. THD+N from the CD input to the speaker output was less than 0.005% 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 –87.49 dB left to right and –85.38 dB right to left. The signal-to-noise ratio with an 8-ohm load from 10 Hz to 24 kHz with “A” weighting was –106.88 dBrA.

From the Dolby Digital input to the loudspeaker output, the left channel measures –0.00 dB at 20 Hz and –0.12 dB at 20 kHz. The center channel measures +0.00 dB at 20 Hz and –0.12 dB at 20 kHz, and the left surround channel measures +0.00 dB at 20 Hz and –0.21 dB at 20 kHz. From the Dolby Digital input to the line-level output, the LFE channel is +0.02 dB at 20 Hz when referenced to the level at 40 Hz and reaches the upper 3-dB down point at 118 Hz and the upper 6-dB down point at 121 Hz.—MJP

Video
The Arcam failed our standard 2:2 and 3:2 video processing tests in both HD and SD, with performance inferior in these regards to that offered by the upconversion in our reference Oppo Blu-ray player. The 2:2 HD failures are fairly common in AVRs, but 3:2 failures are not. A range of normal material, however, revealed no consistent visible artifacts.—TJN

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