MJK simulations - double mouth back loaded horn help. - Page 7 - diyAudio
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Old 8th November 2012, 11:54 AM   #61
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No. Not in my book anyway. Not enough gain on the bottom end. To me, that's the No.1 priority with a back horn & the primary object behind using it in the first place.
will this not sort itself out if they're positioned very close to walls and likely actually in corners?

thanks for the reply.
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Old 8th November 2012, 01:25 PM   #62
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Since you have provided in-room plots which show a chronic lack of LF gain, I would suggest 'probably not.'
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Old 8th November 2012, 04:25 PM   #63
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Since you have provided in-room plots which show a chronic lack of LF gain, I would suggest 'probably not.'
thanks, back to the drawing board some more!
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Old 16th November 2012, 01:39 AM   #64
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is it the drivers low VAS (36ltr @ 216cm^2) compared to its cone area that is making this so hard for me to get something useful?

if the horn volume is too little i get peaky plots/no dampening and usually really bad system delay (see latest attempt below)

if the horn volume is big enough to smooth out the peaks, then it usually has a few large holes in it somewhere and not enough gain.

i tried a front vented, single mouthed horn as this seems to give greater gain than the rear ported and double mouthed ones; but are there enough folds to avoid all the high frequency coming through and ruining another attempted box, like the failures further up?

what is the stuffing strategy for BLH's?

the below plots or of latest attempt, thing is completely un stuffed in the sims.

worth giving a go with a build?

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Old 16th November 2012, 08:59 AM   #65
GM is offline GM  United States
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No clue without the rest of the specs.

Ideally, stuffing would be limited to the filter chamber, but the reality is that the throat and/or mouth area [if front firing] often needs a small amount.

My SWAG is that with so much mids/HF horn gain relative to its bass line that too much low end will disappear once damped and the critical mids may sound too damped/'muffled'.

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Old 16th November 2012, 03:03 PM   #66
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My SWAG is that with so much mids/HF horn gain relative to its bass line that too much low end will disappear once damped and the critical mids may sound too damped/'muffled'.

GM
this was the problem i had with the BiB style top firing horn i made previously (further up in this thread). without any stuffing it was full of horrible muddles and frequency holes, with enough stuffing to reduce the higher frequency mess coming out the terminus, it ended up destroying the low end output bar a huge 40hz thump.

this is why i was hoping the manifold style of horn would remove this problem through its mechanical bandpass nature? the port firing against the wall also seemed to do this job quite well but didn't give enough low end gain to make the design worthwhile.

i would entirely give up with the idea of a horn but its the only design that seems to give enough bass range without maxing out the 1mm Xmax of the driver.
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Old 16th November 2012, 08:41 PM   #67
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It will, but it takes a lot of initial folds: Patent US2224919 - LOUD-SPEAKER - Google Patents

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Old 18th November 2012, 08:06 PM   #68
DrBoar is offline DrBoar  Sweden
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The design you have is more of a flared pipe in the sub 100 Hz region than a horn something like
FRANCY - A low Cost SV572 DHT Amplifier
Will be more like a horn perhaps down to 40-50 Hz depenind on the corner/wall loading. Flimsy plaster walls will not load as well as concrete/brick ones.
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Old 4th February 2013, 03:22 PM   #69
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any input on these? downfiring BiB style and a Woden design inspired attempt, all within the 1mm xmax.

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