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Old 17th November 2010, 12:22 AM   #71
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Now, Xoc1's:

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Old 17th November 2010, 02:31 PM   #72
epa is offline epa  Netherlands
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good job
so you are getting the hang of hr.
concider that 140 db is like a jetfighter over your head
insane loud
here is another one

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Old 17th November 2010, 02:51 PM   #73
epa is offline epa  Netherlands
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modified sym th
only 392 ltrs netto
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you can ad a 3mh coil to smooth out the pasband if you use the b&c driver
just ad 4 in the LE field

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Old 17th November 2010, 03:04 PM   #74
epa is offline epa  Netherlands
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post nr 72 is 537 ltrs netto.
post nr 73 should be 80 volts instead of 89
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Old 17th November 2010, 07:29 PM   #75
Xoc1 is offline Xoc1  United Kingdom
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The B&C 18SW115 driver seems ideal. But is expensive.
In the UK it is 450 compared with the Precision Devices PD1850 at 300
For reference I have attached a dimensioned layout of the 18" 6 fold TH design.
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File Type: pdf 18in - 6 Fold TH Assy.PDF (64.8 KB, 283 views)
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Old 18th November 2010, 03:03 AM   #76
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What programs are you two using in posts 68, 72 & 73?

@ epa: how would those curved bottom pieces in post 73 be made?

@ Xoc1: yeah, that's the downside - but, I think the 2-3dB increase is worth not building 2x the amount of boxes to gain the dB not had (double the driver(s)/cab(s), add 3dB). So, instead of building 2 cabs, spend another $150 (or in your case) to gain that 3dB and save space.
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Old 18th November 2010, 03:52 AM   #77
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P.S. I REALLY like the post 73 response with the B&C 18SW115 - and I like the shape of the curve if there's a way to only add 3 to Le instead of 4. I like the amount of output for it's small size. A definite plus!
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Old 18th November 2010, 04:08 AM   #78
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Quote:
Originally Posted by iand View Post
Here's a 30Hz design.
This one also intrigues me. This driver works very well in the small enclosure - better than the more costly 18SW115. Have you built/sketched this one??
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Old 18th November 2010, 05:22 AM   #79
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I think we are looking at more of a theoretical problem then a real world problem when it comes to excursion, even if the simulations show that excusrion limmiting will occour at so and so many watts at this or that frequency, the real world experience might be different, most often to the better.

According to hornresp my THAM15 design would be pretty useless above 500W of input power, however, real world users claim they seem to handle almost twice that without any serious/notable compromise in preformance, and I'm sure this is true for most TH designs.

As for the simulations I'm sure they are correct from a purly mathematical point of wiev, hornresp is probably the best thing that has happened to us, it really is a wonderful tool and the creator of this software deserves all of our gratitude, but, there is a differance between the theory and real life usage senarios.

I just think it is important to recognize this and bare it in mind when we look at these designs, I'm sure they will preform excellent in a real life envionment where, as allways, careful and signal processing should be applied.
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Old 18th November 2010, 06:56 AM   #80
soho54 is offline soho54  United States
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Everyone just forgets to factor in power compression, and other things that come into effect at the ends of a drivers throw.

Once you get to ~500w with a majority of drivers, it is not unheard of to be 2-4dB down already, so it is easy to see how you can throw 2-3x the power expected into an enclosure, and not have it grenade on you from over excursion. Assuming a HP is in place of course.

The best way to get around this is to not count on having the last 3-6dB of sim output. If you need 130dB at 1m, you need the speakers to sim around 133-136dB.
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