back loaded horns, which is best, front or rear exit? - Page 2 - diyAudio
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Old 24th February 2013, 11:13 PM   #11
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top exit?
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Old 25th February 2013, 12:38 AM   #12
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BIB opens at the top
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Old 25th February 2013, 12:44 AM   #13
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Or the bottom if you invert it
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Old 25th February 2013, 12:53 AM   #14
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Ok, the first sketch I did had a top exit, single fold. The line length looks ok but how about the limit in size of the mouth?
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Old 25th February 2013, 01:06 AM   #15
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Photo on 2-25-56 BE at 1.57 AM #3.jpg

sorry, I can't unreverse it (mac photo booth)

Godzilla, this is the rough shape i had in mind a couple of days ago
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Old 25th February 2013, 05:57 AM   #16
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Quote:
Originally Posted by Bill poster View Post
sorry, I can't unreverse it (mac photo booth)
Just take it into iPhoto for simple manipulation.

Click the image to open in full size.

(photoshop)

Topologically the same as a BIB. It is a pretty shape. The sketch reminds me of the Cat in the Hat.

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Old 25th February 2013, 09:53 AM   #17
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Attachment 332582

sorry, I can't unreverse it (mac photo booth)

Godzilla, this is the rough shape i had in mind a couple of days ago
Click the image to open in full size.

I did something similar (lost the real photos with camera and PC).

I'm either very sensitive to time smear or the single fold (rounded) with a slanted vent spews out a lot of rubbish. Was pretty heavily stuffed at one point which helped but murdered the output. Hitching the whole thing up on legs so the vent was closer the ceiling did help but still had quite a few substantial dips that would have needed more eq tweaks then I'd be willing to use.

Last edited by gafhenderson; 25th February 2013 at 09:59 AM.
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Old 25th February 2013, 11:17 AM   #18
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If you feel you're especially sensitive to group delay, why are you playing with back-horns? Of all the vented enclosure types, they are the hardest to minimise the effects of GD in.
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Old 25th February 2013, 12:27 PM   #19
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If you feel you're especially sensitive to group delay, why are you playing with back-horns? Of all the vented enclosure types, they are the hardest to minimise the effects of GD in.
Just ruling out feckless design. I don't particularly want to use woofers to get the driver low so trying one more with a double mouthed rear firing horn, then I will have to use an mltl crossed to subs around 80hz.

I thought it may have just been the driver but I borrowed some fe166's and made an MDF haruna and still had the same problem.
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Old 25th February 2013, 03:44 PM   #20
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Ghastly combination. I can feel the panel resonance smearing from here.

I still maintain if you think you are especially sensitive to GD, just build a simpler box and have done with it.
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