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Old 26th February 2013, 12:55 AM   #11
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Wouldn't a zig-zag laterally up the flat baffle be the best to smooth-out the alternating reinforcement and cancellation? That is, starting at the top or bottom of the baffle, the first driver is offset somewhat (from center) to the left, the second driver is offset to the right, the third driver is offset to the left, and the fourth driver is offset to the right.

This is just my suggestion based on the little bit of reading I've done concerning flat baffles.

-Pete
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Old 26th February 2013, 08:17 AM   #12
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I'd run them all straight up and down.

The dispersion of a 12" is pretty small as you get higher up, you should be fine.

And I love the idea of covering up lower drivers with a towel.
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Old 26th February 2013, 03:28 PM   #13
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Quote:
Originally Posted by cT equals piD View Post
Wouldn't a zig-zag laterally up the flat baffle be the best to smooth-out the alternating reinforcement and cancellation? That is, starting at the top or bottom of the baffle, the first driver is offset somewhat (from center) to the left, the second driver is offset to the right, the third driver is offset to the left, and the fourth driver is offset to the right.

This is just my suggestion based on the little bit of reading I've done concerning flat baffles.

-Pete

Yes, I wondered about that too. But Rudolf knows a lot more than I do and I'm reluctant to ask too many questions before trying something.
I managed to get a nice piece of baltic ply yesterday, already cut at 30"x 60" and was tempted to start asking if I should cut it narrower or offset the driver array to one side or the other etc. etc. etc.
It's basically endless and before you know it you're trying to construct the ultimate speaker system on the basis of forum posts, unknown driver specs and zero personal experience. . . . . . Though I have to admit, I can't get the top driver at sitting ear level with 12" drivers in a straight line and that's one thing zig-zagging would do. Never mind, I'll start simple and get lesson one done.
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Old 26th February 2013, 07:25 PM   #14
Rudolf is offline Rudolf  Germany
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Quote:
Originally Posted by Hearinspace View Post
. . . Though I have to admit, I can't get the top driver at sitting ear level with 12" drivers in a straight line and that's one thing zig-zagging would do. Never mind, I'll start simple and get lesson one done.
Put the top driver at ear level and zig-zag those below. That is perfectly ok. This is a really CRUDE attempt and the acoustic properties of the towels will be more important than the driver position on the baffle .
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Old 27th February 2013, 11:56 PM   #15
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Rudolf,
Too late ! They're vertical in-line so the top driver is a bit high but it's good for now. The present baffle is 60" x 30" (~ 76cm x 150cm) with the drivers being offset to left of baffle centre by about 7 cm. (I decided to offset to try it, thinking I can trim down the wide side if needed.) Top driver centre is at approx 119cm from floor - a tad high but ok for first listen.
Your idea is greatly appreciated - the results are to me completely surprising. Listening at first the sound was only so-so, kind of noisey/complicated and with relatively little LF content, much poorer than having a single driver. Then my wife reminded me that I had yet to put the material in back. I thought perhaps it would make the sound even worse but I got an old winter coat and hung it behind the baffle and instantly there was good bottom end and again a kind of unity of the sound - like a single driver. Very impressive. I'll have to redo this if I want to use it for listening while sitting down, which I'm beginning to think I'd like to try. (I usually listen to horns.)
Thanks again Rudolf , this is a great first lesson.
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