AV Receiver Reviews

Two channels driven continuously into 8-ohm loads:
0.1% distortion at 135.5 watts
1% distortion at 167.8 watts

Five channels driven continuously into 8-ohm loads:
0.1% distortion at 70.5 watts
1% distortion at 78.6 watts

Seven channels driven continuously into 8-ohm loads:
0.1% distortion at 69.6 watts – Front Left
1% distortion at 77.5 watts – Front Left
0.1% distortion at 36.8 watts – Surround Back Left
1% distortion at 51.7 watts – Surround Back Left

Analog frequency response in No Processing mode:
–0.10 dB at 10 Hz
–0.02 dB at 20 Hz
–0.06 dB at 20 kHz
–2.81 dB at 50 kHz.

Analog frequency response with signal processing:
–0.33 dB at 10 Hz
–0.09 dB at 20 Hz
+0.01 dB at 20 kHz
–69.24 dB at 50 kHz.

This graph shows that the MRX 1120’s left channel, from Analog1 input to speaker output with two channels driving 8-ohm loads, reaches 0.1% distortion at 135.5 watts and 1% distortion at 167.8 watts. Into 4 ohms, the amplifier reaches 0.1% distortion at 218.4 watts and 1% distortion at 243.2 watts.

There was no multichannel input to measure. THD+N from the CD input to the speaker output was less than 0.004% 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 –77.12 dB left to right and –77.07 dB right to left. The signal-to-noise ratio with an 8-ohm load from 10 Hz to 24 kHz with “A” weighting was –109.43 dBrA.

From the Dolby Digital input to the loudspeaker output, the left channel measures –0.01 dB at 20 Hz and –0.19 dB at 20 kHz. The center channel measures –0.01 dB at 20 Hz and –0.20 dB at 20 kHz, and the left surround channel measures –0.01 dB at 20 Hz and –0.18 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 122 Hz.—MJP