The left surround channel is very quiet compared to the other channels, I have checked with other speakers - it is definitely the amp channel. Any idea what to check?
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Your Marantz receiver has automatic speaker setup and equalization called Audyssey. It uses a microphone to measure your room and set speaker levels. If the Audyssey setup program hasn’t been run yet or if the setup procedure had measurement errors, then one or more of your speakers could have the wrong levels set by the receiver. I’d start by running the Audyssey setup program again, even if you’ve run it already. Place the measurement microphone centrally in your listening room at about ear-height. If there are still issues after running the Audyssey setup, then you can manually adjust the individual speakers. The receiver’s setup menu will allow you to set individual speaker volumes, and you can even play a test tone through each speaker to see how they compare. If you set all the speaker levels to how you like them and one speaker still seems very quiet then there might be something wrong with the receiver’s software that would require professional repair.
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Thanks for the suggestion! Unfortunately not the problem though. The Audyssey originally put the surrounds at -5dB and -3.5dB. Since the channel has had the problem it tries to set them to +12dB (the max boost) and -3.5dB. The inbuilt test tone is also much, much quieter on the surround.
In that case, it sounds like the receiver's amplifier channel has a problem. Double-check the speaker and the wiring to make sure there's no issue there causing the receiver to throttle back that channel. And you can try resetting the receiver using the process outlined in the owner's manual (or simply unplug for a few minutes). If nothing seems to get that channel back to normal volume levels, you might have a defective amplifier channel in the receiver that would need professional repair.
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