AV Receiver Reviews

Two channels driven continuously into 8-ohm loads:
0.1% distortion at 110.9 watts
1% distortion at 135.5 watts

Five channels driven continuously into 8-ohm loads:
0.1% distortion at 87.6 watts
1% distortion at 98.6 watts

Seven channels driven continuously into 8-ohm loads:
0.1% distortion at 65.3 watts
1% distortion at 75.8 watts

Analog frequency response in Pure Direct mode:
–0.05 dB at 10 Hz
–0.01 dB at 20 Hz
+0.07 dB at 20 kHz
–2.70 dB at 50 kHz.

Analog frequency response with signal processing:
–0.41 dB at 10 Hz
–0.10 dB at 20 Hz
–0.40 dB at 20 kHz
–62.19 dB at 50 kHz.

This graph shows that the STR-ZA3000ES’s left channel, from CD input to speaker output with two channels driving 8-ohm loads, reaches 0.1% distortion at 110.9 watts and 1% distortion at 135.5 watts. Into 4 ohms, the amplifier reaches 0.1% distortion at 135.8 watts and 1% distortion at 172.8 watts.

There was no multichannel input to measure. THD+N from the CD input to the speaker output was less than 0.009% 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 –89.09 dB left to right and –81.26 dB right to left. The signal-to-noise ratio with an 8-ohm load from 10 Hz to 24 kHz with “A” weighting was –106.49 dBrA.

From the Dolby Digital input to the loudspeaker output, the left channel measures –0.04 dB at 20 Hz and –0.45 dB at 20 kHz. The center channel measures –0.05 dB at 20 Hz and –0.49 dB at 20 kHz, and the left surround channel measures –0.04 dB at 20 Hz and –0.49 dB at 20 kHz. From the Dolby Digital input to the line-level output, the LFE channel is +0.04 dB at 20 Hz when referenced to the level at 40 Hz and reaches the upper 3-dB down point at 116 Hz and the upper 6-dB down point at 119 Hz.—MJP