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Old 23rd February 2009, 04:40 PM   #1
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Default aligning drivers

I was thinking about methods to align the acoustic centers of drivers. I'm not entirely sure that I will get any closer to time or phase alignment but all in all it seems like a good idea. So I was wondering what the merits of a couple different approaches might be.

-Angled baffles.
Seems easy enough to make.

-Stepped baffles.
looks funny to me. Seems that the shelf would cause diffraction.

-Waveguides.
Seems like it might be a great choice but might cause a lot of other issues. Also to get the mouth large enough for a given xover that the ctc distance would have to be pretty big too. Problem or not?

-nothing.
Too much hassle for too little benefit.

Would really love to hear peoples thoughts and experiences on this.

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Old 23rd February 2009, 05:10 PM   #2
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Stepped baffles work fine for me. I've also built angled cabinets that worked well. IMHO calculations and prediction might be a little shaky, but it's a great tuning tool and I'd never consider just mounting drivers on a flat surface and hoping for the best.
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Old 23rd February 2009, 07:00 PM   #3
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I build all mine using steps or angles... but I try to do steps first.. I find that the T/A and coherency is better then just angling the baffle or angling the listening position via stands..

time and phase is a lost art IMO
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Old 23rd February 2009, 07:11 PM   #4
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Old 23rd February 2009, 07:30 PM   #5
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My previous design was sloped, but I think my next will be stepped.
It's true that a stepped baffle will cause some diffraction, but often the driver cone itself is a greater source of diffraction.
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Old 23rd February 2009, 07:39 PM   #6
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Art Ludwig does it with angled steps.

http://www.silcom.com/~aludwig/Louds...Time_alignment
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Old 23rd February 2009, 07:47 PM   #7
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ahh.. a man after my heart... I guess this is the car audio side of me speaking... but full control over xover point,slope,T/A and eq makes me happy

Quote:
Originally posted by abefroeman
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Old 23rd February 2009, 07:51 PM   #8
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here is what I am building now...


sorry I draw like a retarded gang banger

Click the image to open in full size.
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Old 23rd February 2009, 08:36 PM   #9
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Sorry, while a sphere as the external image of an enclosure could be a good thing when it comes to spread diffaction with regards to frequency, a sphere or a tube as the internal shape of an enclosure isnīt the best shape because standing waves will be gathered at certain frequences. Having visited conserts in "the Globe" in Stockholm and the lectue-theatre that has a dome as aprominent part to it.

About the time alignment the problem is that time delays because of a crossover e.g. is not cured by a "step function" as it is a continuous rather than a descrete function.
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Old 23rd February 2009, 08:41 PM   #10
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Quote:
Originally posted by The golden mean
Sorry, while a sphere as the external image of an enclosure could be a good thing when it comes to spread diffaction with regards to frequency, a sphere or a tube as the internal shape of an enclosure isnīt the best shape because standing waves will be gathered at certain frequences. Having visited conserts in "the Globe" in Stockholm and the lectue-theatre that has a dome as aprominent part to it.

About the time alignment the problem is that time delays because of a crossover e.g. is not cured by a "step function" as it is a continuous rather than a descrete function.
If you stuff a long tube properly, you can kill most or all of the midrange reflections.

I think people are just talking about physical offsets, not those introduced by crossovers.
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