Bookshelf Speaker Reviews

Five channels driven continuously into 8-ohm loads:
0.1 percent distortion at 162.0 watts
1 percent distortion at 184.5 watts

All channels driven continuously into 8-ohm loads:
0.1 percent distortion at 120.4 watts
1 percent distortion at 151.7 watts

Analog frequency response in Pure Audio mode:
–0.07 dB at 10 Hz; –0.02 dB at 20 Hz
–0.03 dB at 20 kHz; –0.24 dB at 50 kHz

Analog frequency response with signal processing:
–0.34 dB at 10 Hz; –0.12 dB at 20 Hz
–0.43 dB at 20 kHz; –38.47 dB at 50 kHz

This graph shows that the TX-SR805’s left channel, from CD input to speaker output with two channels driving 8-ohm loads, reaches 0.1 percent distortion at 181.8 watts and 1 percent distortion at 212.3 watts. Into 4 ohms, the amplifier reaches 0.1 percent distortion at 327.6 watts and 1 percent distortion at 369.0 watts.

Response from the multichannel input to the speaker output measures –0.07 decibels at 10 hertz, –0.02 dB at 20 Hz, –0.03 dB at 20 kilohertz, and –0.23 dB at 50 kHz. THD+N from the CD input to the speaker output was less than 0.004 percent at 1 kHz when driving 2.83 volts into an 8-ohm load. Cross-

talk at 1 kHz driving 2.83 volts into an 8-ohm load was –90.08 dB left to right and –87.96 dB right to left. The signal-to-noise ratio with 2.83 volts driving an 8-ohm load from 10 Hz to 24 kHz with “A” weighting was –108.17 dBrA in Pure Audio mode.

From the Dolby Digital input to the loudspeaker output, the left channel measures –0.02 dB at 20 Hz and –0.31 dB at 20 kHz. The center channel measures –0.02 dB at 20 Hz and –0.33 dB at 20 kHz, and the left surround channel measures –0.02 dB at 20 Hz and –0.32 dB at 20 kHz. From the Dolby Digital input to the line-level output, the LFE channel is +0.11 dB at 20 Hz when referenced to the level at 40 Hz and reaches the upper 3-dB down point at 96 Hz and the upper 6-dB down point at 116 Hz.—MJP