I had to place my sub in a corner under one of my rear speakers. There are instructions on manual how to adjust for phase when using hi level input. When testing for phase, should just the front speakers be on? As I only notice the difference in phase when the surround speakers are on as well.
The manual seems to state that the hi level input has to be set just for stereo output.
Thanks
I wouldn't be using high level connections with a sub placed behind the listener.
When you use high level connections you expect the sub to underpin the main/stereo speakers. A low pass filter with a very low frequency setting ensures the minimum of overlap between speakers and subwoofer.
Placing the sub behind you means the subwoofer is now
competing with the main/stereo speakers rather than helping. This will almost certainly lead to phase-related humps and bumps because of the distance between the units. The subwoofer is also much more likely to noticed as being behind you.
Lets assume you adjust the subwoofer's phase to match your rear speakers. The sub is now working at its best with your rear speakers. But you don't use rear speakers for stereo music listening where sound quality and a flat frequency response are most desirable.
If you really have no room for your subwoofer up at the front between your main/stereo speakers can't you face your whole system the opposite way?
Or even listen across your room rather than along it?
Placing your subwoofer behind you is usually the worst of all the possible alternatives. Will it go under a coffee table or other furniture to hide its presence?
If you really have no choice then you must try adjusting phase while sitting in your usual seat with only the front main/stereo speakers running if music is most important to you. If films are your main interest then try adjusting phase with all speakers running. For films I'd be using a low level connection anyway.