Weak surround sound effect with B&W CM series - AVS Forum
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post #1 of 7 Old 03-15-2012, 06:54 PM - Thread Starter
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I have just setup my 5.1 surround system using B&W series. Here is the setup:

Front: CM9
Surround: CM5
Center: CMC2
Sub: ASW12CM

Pre-processor: Rotel RSP-1570
Amp: Rotel RMB-1565
BDP" Sony BDP-S5000ES

I matched each channel with the SPL meter @ 75db. However when I play the movie, the sround effect is not very weak. It seems that the suround sound levels from the speaker are pretty low compared to the sound level from the front although the test tone is a perfect match between the front and the back. The room is a pretty large by 13"x40" in size. The fronts are at 10 and 2 o'clock and the surroundings are at 4 and 8 o'clock positions. The walls are covered with sound panels and the front is a 120" screen. What can be wrong? Should I raise the level of the surround to more than the front?

Advises are welcomed! Thanks in advance.
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post #2 of 7 Old 03-15-2012, 08:21 PM
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Quote:
Originally Posted by unidisk View Post

Should I raise the level of the surround to more than the front?

You should adjust them to whatever sounds good to your ears. Guidelines are just that; guidelines. Setting everything for the same output level sounds good on paper, but might not sound good to your ears. However, your ears are the ultimate judge, so it's probably best to use those when fine tuning your system.

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post #3 of 7 Old 03-15-2012, 08:40 PM
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Make sure they're in phase and their distances/delays are set correctly. Oh, and make sure all of their drivers are functioning.

Two would seem to be two too many to me too.
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post #4 of 7 Old 03-15-2012, 09:23 PM
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Some movies/concerts dont have a lot of surround mastered in but really, you shouldn't really notice them anyway.....they are there to fill, not to match the front. It was edited that way as the director wanted it to be.

If you feel you want to go against the grain, switch it to all channel stereo on your pre.
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post #5 of 7 Old 03-16-2012, 12:52 AM
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I'd also make sure your sources are sending a 5.1 signal to the receiver. Many people incorrectly setup the output and end up with pro logic instead of dolby digital etc
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post #6 of 7 Old 03-16-2012, 06:20 AM
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I had a similar issue - after speaking with my audio dealer, I increased the center and surrounds 2db over the mains. I'm happier with the result. See what you think - every room is different
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post #7 of 7 Old 03-16-2012, 07:00 AM
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Quote:
Originally Posted by unidisk View Post

I have just setup my 5.1 surround system using B&W series. Here is the setup:

Front: CM9
Surround: CM5
Center: CMC2
Sub: ASW12CM

Pre-processor: Rotel RSP-1570
Amp: Rotel RMB-1565
BDP" Sony BDP-S5000ES

I matched each channel with the SPL meter @ 75db. However when I play the movie, the sround effect is not very weak. It seems that the suround sound levels from the speaker are pretty low compared to the sound level from the front although the test tone is a perfect match between the front and the back. The room is a pretty large by 13"x40" in size. The fronts are at 10 and 2 o'clock and the surroundings are at 4 and 8 o'clock positions. The walls are covered with sound panels and the front is a 120" screen. What can be wrong? Should I raise the level of the surround to more than the front?

Advises are welcomed! Thanks in advance.

This seems like my worst fear coming true, which is Warm musical speakers are not very effective in a surround sound setup. you may want to bump up the level on the surrounds, but my instinct tells me that will not improve your surround effects. Try it though.
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