15" tapped horn with RCF - Page 12 - diyAudio
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Old 27th November 2010, 11:22 PM   #111
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Quote:
Originally Posted by epa View Post
justin ,we need to make a new topic,because this has no longer anything to do with woodys design ,

C/E/X PA Flat to 30 (FT30) PA TH Awesomeness

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Old 23rd April 2011, 07:06 PM   #112
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Default Plans needed

epa can you please post the build plans for this subwoofer with the B&C 18sw115 ? Thanks so much. See pics attached. These different threads are driving me crazy.
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File Type: jpg woody.jpg (206.8 KB, 693 views)
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Old 23rd April 2011, 08:04 PM   #113
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Quote:
Originally Posted by soho54 View Post
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.
I'm a little late to the game, but wanted to post my 2 cents: with a typical high-DF amp, you will NOT be putting in extra power for the same SPL as power compression kicks in. The impedance rises... unless you mean that the volume is cranked up after the fact, in which case the volume should be set and then locked.

Also, IIRC, musical transients are little-affected by power compression.
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Old 24th April 2011, 01:03 AM   #114
Djim is offline Djim  Netherlands
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Quote:
Originally Posted by 454Casull View Post
I'm a little late to the game, but wanted to post my 2 cents: with a typical high-DF amp, you will NOT be putting in extra power for the same SPL as power compression kicks in. The impedance rises... unless you mean that the volume is cranked up after the fact, in which case the volume should be set and then locked.
Also, IIRC, musical transients are little-affected by power compression.
I'm afraid, you don't remember it correctly because there is nothing wrong with Soho's statement you quoted. Besides "volume" is not referring to any kind of electric variable/value, it actually doesn't matter much how cheap your amplifier is as long it can deliver the power necessary to drive the driver into power/dynamic compression.

The relation is power versus electrical/physical properties of the driver. Also transients (and even response) are very much affected when a driver 'suffers' from severe power/dynamic compression. 'Suffer' with two accents because PA driver are often designed to have better response at 2/3dB power/dynamic compression.

Last edited by Djim; 24th April 2011 at 01:31 AM.
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Old 1st October 2012, 03:38 AM   #115
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This looks like a nice enclosure with great performance. Do you have a cut list or plans? I would certainly like to build it for my DJ set up.
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Old 7th June 2013, 06:18 AM   #116
stewin is offline stewin  Kenya
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my project loaded with an 18inch driver
Attached Images
File Type: jpg T118 angle lines drawing sub left clear.jpg (132.8 KB, 277 views)
File Type: jpg T118 angle lines drawing sub right clear.jpg (117.2 KB, 251 views)
File Type: jpg T118 lines drawing sub left.jpg (142.3 KB, 238 views)
File Type: jpg T118 bottom markings sub.jpg (172.5 KB, 233 views)
File Type: jpg Pic_1018_006.jpg (141.0 KB, 110 views)
File Type: jpg Pic_1018_002.jpg (157.8 KB, 117 views)
File Type: jpg Pic_1018_022.jpg (136.3 KB, 79 views)
File Type: jpg Pic_1018_026.jpg (104.1 KB, 79 views)
File Type: jpg Pic_1018_027.jpg (114.2 KB, 79 views)
Attached Files
File Type: pdf gtG th18 big 0.625 wood .pdf (705.4 KB, 34 views)
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Old 7th June 2013, 04:22 PM   #117
FlipC is offline FlipC  United States
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Looks like a nice build.
Should throw up the sketch up model.

And Nice bug in the 1 pic!
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Old 9th June 2013, 02:44 PM   #118
stewin is offline stewin  Kenya
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Quote:
Originally Posted by FlipC View Post
Looks like a nice build.
Should throw up the sketch up model.

And Nice bug in the 1 pic!
also please do tell me is xocs1 design better than this in terms of spl and flat in response.

here you go have fun
Attached Files
File Type: zip T118 lines drawing sub.zip (391.1 KB, 44 views)
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Old 10th June 2013, 12:30 PM   #119
Xoc1 is offline Xoc1  United Kingdom
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Hi Stewin
I have not found the time yet to work out the path length of your TH fold.
I have CAD of similar folds so will adapt one to your dimensions.
I would need to know more about the drivers you have to be able to run a sim.
You said in the TH18 thread that you have the 'new retone nr 18 speaker' but I cant seem to find any details on this driver on line.
As for the throat restriction you have used, that adds a lot more unknowns that might only be answered with practical testing.
The 35Hz hi pass filter you have sounds perfectly reasonable but to check it in Hornresp you will need all the driver parameters.
The Xoc1TH18 with the throat correction might be louder at the expense of not being lower but it all depends on the driver.
Regards Xoc1
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Old 10th June 2013, 08:01 PM   #120
stewin is offline stewin  Kenya
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thanks xoc1 . the speaker is Chinese and there are no specs or booklet in the box

http://translate.google.com/translat...ed=0CGsQ7gEwCA

>>>>also another challenge i got is designing a 24db crossover with 35hz cutoff but it failed because when i connect it the bass is not even close to deep, it seems like it rolls of at around 80hz instead of 35hz. where am i wrong in the crossover?.
Attached Images
File Type: jpg gtG 4way with preamp 35h to 22k.jpg (376.3 KB, 62 views)
Attached Files
File Type: pdf block diag.pdf (10.1 KB, 12 views)
File Type: pdf gtG 4way with preamp 35h to 22k schematic.pdf (61.5 KB, 29 views)
File Type: pdf gtG 4way with preamp 35h to 22k components full.pdf (68.7 KB, 15 views)
File Type: pdf gtG 4way with preamp 35hz to 22k pcb full artwork .pdf (346.4 KB, 19 views)

Last edited by stewin; 10th June 2013 at 08:05 PM.
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