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Author Topic: Where to align the main speakers to the subwoofers?  (Read 3989 times)

Mark Wilkinson

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Re: Where to align the main speakers to the subwoofers?
« Reply #10 on: June 05, 2016, 02:35:18 pm »

Many Thanks Merlijn, Very nice.

Trying to get an intuitive feel for aligning to 1/3 oct above crossover.....and for aligning to rear...
Are these mainly due to trying to overcome the geometry of sub-to-main separation?

I get the point about longer wavelengths allowing more wiggle room to offset relative distance changes.
I'm also thinking that the increasing sub group delay (as freq drops) is working to advantage to overcome moving closer to speakers too ...???

If subs and mains are adjacent,  would you align to x-over freq, or 1/3 up? 

Oh, I assume the calculator is seeded with LR24 .....?
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Merlijn van Veen

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Re: Where to align the main speakers to the subwoofers?
« Reply #11 on: June 05, 2016, 03:32:02 pm »

Overcoming the geometry of the sub-to-main separation as you call it, is the very function of this calculator.

The 1/3 8ve up, only matters for determining the actual alignment position (not the phase alignment itself) when you decide to abandon the approach of aligning in the back of the venue or if you're sources aren't co-located.

How far you can move forward is determined by how much phase offset in the back you're willing to except which IMO is 120deg at most before the onset of cancellation. Since typical crossover ranges have a span of 1 octave it makes sense to look at the "higher" frequencies because there's less wiggle room for determining the positions.

More and more systems are already aligned if the speaker grills are physically aligned and group delay is already accounted for.

The crossover order and how to account for it is up to you. 8th order range is about a fifth so you might as well look at the actual crossover frequency. 4th spans about 1 octave so look 1/3rd up and 2nd spans almost 2 octaves so look 2/3rd to 1 octave up.


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Mark Wilkinson

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Re: Where to align the main speakers to the subwoofers?
« Reply #12 on: June 05, 2016, 04:08:52 pm »



The 1/3 8ve up, only matters for determining the actual alignment position (not the phase alignment itself) when you decide to abandon the approach of aligning in the back of the venue or if you're sources aren't co-located.

How far you can move forward is determined by how much phase offset in the back you're willing to except which IMO is 120deg at most before the onset of cancellation. Since typical crossover ranges have a span of 1 octave it makes sense to look at the "higher" frequencies because there's less wiggle room for determining the positions.


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Thank You, ......picturing it.

I've been working with flat phase alignments of adjacent subs/mains....trying to conquer geometric separation first.
Step at a time  :)
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ProSoundWeb Community

Re: Where to align the main speakers to the subwoofers?
« Reply #12 on: June 05, 2016, 04:08:52 pm »


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