Subwoofer Distance Setting - AVS Forum
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post #1 of 11 Old 06-28-2013, 12:19 AM - Thread Starter
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Hi all, I'm using my psb s300 sub as bedside table. It is just a foot away from the MLP. FL/FR/C are at 9.9 feet. SR at 4.5 feet and SL at 5.1 from MLP.

I have always been setting the sub distance longer than that of the mains to bring it in phase with them. But at that time the sub was physically 12 feet away from MLP. I just recently moved it right next to MLP coz the response is more amazing than ever with no localization despite the fact that it's just a foot away from me.

While setting the distance for sub in AVR, it is in perfect phase with mains at 5.3 feet. But, at the same time it is in perfect phase with mains at 16.3 feet also.
Which distance should I use?

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post #2 of 11 Old 06-28-2013, 06:17 AM
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i would change the distance setting and measure to see which one is giving you the best response and go from there.
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post #3 of 11 Old 06-28-2013, 08:00 AM - Thread Starter
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If I keep smaller distance setting i.e. 5.3 feet for the sub and 9.9 feet for the mains, which will play first? Sub or the mains?

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post #4 of 11 Old 06-28-2013, 08:27 AM
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Quote:
Originally Posted by braveheart123 View Post

If I keep smaller distance setting i.e. 5.3 feet for the sub and 9.9 feet for the mains, which will play first? Sub or the mains?
The sub will be delayed in relation to the mains which is what you want since the sub is physically closer than the mains. If 5.3 feet provides the smoothest FR at the LP, I would use 5.3 feet.

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post #5 of 11 Old 06-28-2013, 12:14 PM - Thread Starter
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5.3 feet for the sub sounds better. I got a lil confused coz I always had to delay the mains by adding extra distance on the sub as it was physically 12 feet away from me. But since it's right next to the MLP, I should delay the sub in relation to mains.

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post #6 of 11 Old 07-01-2013, 09:36 AM
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I am wondering how you decuced that those were the best distance settings. Did you measure with a test tone? Did you use a frequency sweep?
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post #7 of 11 Old 07-02-2013, 12:09 PM - Thread Starter
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Originally Posted by Larry L View Post

I am wondering how you decuced that those were the best distance settings. Did you measure with a test tone? Did you use a frequency sweep?

Put the avr in 2.1 stereo mode, run an 80Hz test tone or any test tone that corresponds to the crossover frequency you set on the AVR, put the spl meter at the MLP, and change the distance of subwoofer in AVR. When the sub and the mains are in perfect phase, you get the max SPL. When they are completely out of phase, you get the lowest SPL.

Set the sub distance in AVR that offers highest SPL.

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post #8 of 11 Old 07-02-2013, 04:16 PM
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Quote:
Originally Posted by braveheart123 View Post

Put the avr in 2.1 stereo mode, run an 80Hz test tone or any test tone that corresponds to the crossover frequency you set on the AVR, put the spl meter at the MLP, and change the distance of subwoofer in AVR. When the sub and the mains are in perfect phase, you get the max SPL. When they are completely out of phase, you get the lowest SPL.

Set the sub distance in AVR that offers highest SPL.
If you want to check the blend with the CC, put the receiver in PLIIX Movie mode. Movie mode sends all "identical" information from the L/R speakers to the CC. Since the whole signal is identical, everything goes to the CC and you can check the subwoofer blend with that very important speaker also.

Craig

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post #9 of 11 Old 07-02-2013, 08:25 PM - Thread Starter
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Thanks craig, I will try that. But doesn't CC share bass frequencies with the mains? I mean that's the reason why we bring the sub in phase with mains only coz the processor routes low frequencies of CC to the mains. I read it somewhere a long while ago, can't remember now.

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post #10 of 11 Old 07-03-2013, 12:41 AM
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Quote:
Originally Posted by braveheart123 View Post

Thanks craig, I will try that. But doesn't CC share bass frequencies with the mains? I mean that's the reason why we bring the sub in phase with mains only coz the processor routes low frequencies of CC to the mains. I read it somewhere a long while ago, can't remember now.
It doesn't. Bass from the center channel is re-routed to the sub if XO is set properly. The best is to bring the sub in phase with all speakers if possible.
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post #11 of 11 Old 07-03-2013, 03:09 AM - Thread Starter
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It doesn't. Bass from the center channel is re-routed to the sub if XO is set properly. The best is to bring the sub in phase with all speakers if possible.

That's only worth a try if one has engaged All Channel Stereo mode. If we bring all the speakers in phase and invoke DTS/DD for movies, sound stage shifts to surrounds. I tried this a long time ago and that's the thing I noticed. IMO, surrounds should be a bit misaligned wrt to sub or, in other words, out of phase wrt sub in order to get best cohesion between the front three speakers and surrounds for DTS/DD decoding.

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