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Old 9th October 2008, 09:37 PM   #31
jbell is offline jbell  United States
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screamers:
hadn't considered 'full size' modeling.

I just use graph paper, and scissors.

If you know the total volume of your cabinet, you can set your desired LxWxH of your cabinet. Find your start and ending areas, which since you know the W of the cabinet, can be translated into the side profile of your 'horn' on graph paper. (a long skinny triangle, usually) For example, I used a 24" internal dimension wide cabinet, and had a 600cm S1, which translated into just under 4" tall start of my horn.

Start at the big end, and work to the small end. If you allowed a correct tolerance for your internal panels -- you should be about right on the money first time... (on my original big TH, I started on the small end, and ended up making it a little longer than I had originally planned, and figured -- oh well.) If you end up a little short or long, or don't end up where you wanted, you need to adjust your height vs depth slightly. Usually you can get very close within about 3 iterations.

With a HP @45 hz, your cabinet should be every bit as loud as mine, and much smaller. Since my goal was permanent install, getting the extra extension was worth it. For you, the smaller cabinet is of obvious benefit. Good luck and TURN IT UP
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Old 10th October 2008, 12:45 AM   #32
GM is offline GM  United States
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Originally posted by jbell

..........I need my 40hz... still, It just doesn't sound 'deep' without that fundamental.

Greets!

Agreed, I just wanted to make sure what the desired performance criteria is.

Well, all my sims are just Prof. Leach's math and haven't played with the TH wizard till today beyond seeing if I could audibly improve a few existing sims I'd already done and since I couldn't, I saw no reason to spend any more time with it.

That said, I'd been wondering if THs would respond well using CD horn design as it does with hypex alignments and judging by your sim it looks far better than most others, so can't match/best it with the way I calc them and probably couldn't do any better fiddling with the TH wizard. I mean if you shrink mine it will just become increasingly under-damped (increasing mid-band dip).

If built, it will be interesting to see if it performs as predicted.

GM
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Old 21st October 2008, 03:31 AM   #33
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So does anyone have any affordable 15" options for a tapped horn for PA use.
The BnC is about $300 plus
The 3015lf about $129
The 4015 Definimax $200 Plus (not much better than 3015)

Other drivers? 12" perhaps.
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