Collaborative Tapped horn project - Page 416 - diyAudio
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Old 8th February 2014, 07:39 PM   #4151
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4 of those with about 3000rms each should be killer!
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Old 9th February 2014, 02:34 PM   #4152
wae is offline wae  Netherlands
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Hi All,

Has everyone left the planet......

(or information overload?)

Frans

p.s. Busy doing my PA / weekend warrior / Portable TH / what have you version. First results sucks (completely my fault), next much better (thanks to the THAM12 example, Hornresp and some members on this forum), now going for version 3, most likely a single fold 42Hz which could just about handle a band (kick and 5-string bass.) It will fit on the back seat of any car, easy to handle and corner installed. Just one will go 135 dB, flat to about 180 Hz (+/- 3 dB).

Main issue was XVAR!!!! (the models AND real world show high XMAX)

The single fold looks promising (8 mm XMAX @ 400 watts)
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Old 9th February 2014, 03:14 PM   #4153
stewin is offline stewin  Kenya
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hi frans pls post pictures .
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Old 5th May 2014, 11:58 PM   #4154
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Quote:
Originally Posted by Don Snyder View Post
Sawdust, at last!

Thanks to William Cowan's encouragement and David McBean's Hornresp, and Tom Danley's all-too-rare hints (c'mon Tom, just one more hint).

Don

P.S. Check out the view, ain't San Diego great!
Don, I'm in San Diego too and have a couple of tapped horns here.
Hopefully soon I'll have my Synergy horns finished in my car too.

Also, not sure if you knew this, but there's a prosound vendor in San Diego that has SH-50s for rent. They're quite affordable; something like $40 per day.
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Old 24th November 2014, 05:35 PM   #4155
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Been reading through all the posts from page one past week or so, up to page 60 or so currently. Learnt a fair amount so far, still plenty more pages to go though ! Thought I'd post here on the off change anyone still uses the thread due to wealth of knowledgeable people on here.

I've been looking to try and design a tapped horn for home use under two JBL 8340 cinema speakers that I'm putting into square boxes to enable pole mounting. I want 20hz ideally, will be for movies, processed via a miniDSP and miniDIGI taking input from the toslink output on the TV. When I use for music, which I will undoubtedly do I aim to change HP to 35hz to make things easier on the neighbours :P, but the LP can be anywhere around 80-100, as the JBL's do 45hz on their own.

Am looking at a Peerless SLS-P830669 12" woofer, and it says on the data sheet that maximum linear excursion is 8.3mm, is this center-to-peak or peak-to-peak ?

I have a design in hornresp that gives me the response I want, however at 30hz exceeds 8.3mm by 2mm or so.

Can post screen shots if anyone is interested, this is all just in planning phase at the moment.

Thanks,

Myles
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Old 24th November 2014, 07:50 PM   #4156
GM is offline GM  United States
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Linear normally means Xmax = center to peak, which is true for all the Peerless specs I know about; otherwise it normally stipulates peak to peak, so divide by 2.

GM
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Old 24th November 2014, 09:05 PM   #4157
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Thanks for the reply GM, I've looked at Tymphany's Architecture Notes on their website, specifically around their SLS line and it says the spider is designed to allow more than 18mm of cone travel so that would make me think your right in them being center to peak.

Next question is on a TH that I have come up with, s2 is 800cm2 as is s3 so no expansion, with negative expansion from s3 - 34, yet response looking not bad ? -3db @ 20hz and just about plays up to 80hz which is ideal to cross over into my JBL's. Is this correct though ? Is reason why this wouldn't work ?

http://i1359.photobucket.com/albums/...ps51babdea.png

Thanks,

Myles
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Old 24th November 2014, 11:04 PM   #4158
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Quote:
Originally Posted by stewin View Post
my project th118
Hi Stewin, nice build, what driver did you use? And how did you get rid of the ripple some commonly seen on tapped horns?
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Old 25th November 2014, 06:53 AM   #4159
GM is offline GM  United States
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Originally Posted by myleslewis View Post
Thanks for the reply GM.....Is reason why this wouldn't work ?
You're welcome! None I can think of ATM, I mean it's a tapped, mass loaded pipe [T-MLTL], so if it meets your performance requirements at a 100 w limit.........

To better see its Xmax limits though, I recommend setting Eg = 2.83V and use the max SPL tool in the acoustic power window.

Note too that technically, L12, L23, L34 [L45] should be a parabolic expansion for typical box construction, though in your alignment the difference between the sim and reality is moot due to either being a short length or is a constant [no taper] expansion.

GM
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Old 25th November 2014, 09:19 AM   #4160
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Thanks, will have a look later at the max Xmax feature later. May tweak it a little, had it ruler flat but hit 10mm Xmax so will check max Xmax feature and tweak design. Will post results.

Thanks,

Myles
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