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In the Forum: Horn-Loaded Speakers
In the Thread: Good midbass is complicated, if not unobtainable.
Post Subject: Time AlignmentPosted by Jorge on: 9/8/2013
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There are a few at least theoretical backdraws for the Array in my view.

Of course having a lot of different drivers playing at the same frequency implies that all of them should work in perfect unison,  if one starts lagging a little bit it will mess everything up.  I dont know how perfect drivers can be made or quality control issues and what parameters affect exactly what they can play, but it seems to me there is a lot of room for error.  Soundwise, they are not too bad actually.

Be careful about time alignment, I once thought it would look cool to have a slanted array of drivers,  what a mistake, it sounded just awful all drivers perfectly NOT time aligned.  I am afraid this will happen with your "square" configuration if you try to toe in your speakers:  But it is always good to make it a see for yourself.

Rewind, The compression driver that would go the lowest that I could find was the JBL 2490, the specs have the FS at 250 hz.  I placed it inside a huge 36" across Horn and I made it go down even lower to 200 hz  the horn should have loaded it down to 120 hz.  Maybe not the best sound from it but the idea was to see how low it could go and how it would sound.  The only drivers I know off that can go lower are the Goto SG146 LD  specified from 20 hz to 500 hz. It is a monster and that would require as you say a much bigger horn.  There are also the GOTO 500 series specified from 100 hz up to 8 khz which should be wonderful for this application,  but I have heard from owners that it does not go as low as the JBL2490 does.   Unluckily I dont have those Goto drivers around to play with to confirm this,  but the SG 146 LD is on my very short list.

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