C/E/X PA Flat to 30 (FT30) PA TH Awesomeness - Page 22 - diyAudio
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Old 6th April 2011, 11:05 AM   #211
djk is offline djk
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Go to a library and borrow a book on filters.

The Active Filter Cookbook by Don Lancaster is good.

A filter in an EQ or crossover may be modified to have the center frequency and Q that a specific design requires.
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Old 18th April 2011, 04:19 AM   #212
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I just realized in your dual 12" cab SPL plot that since it's 4 drivers which means only two cabs. That might me pretty excellent if 4 cabs were used! BUT, I don't get those drivers here tho (not to my knowledge)

The plot on the left goes with the box on the left, correct?

Quote:
Originally Posted by epa View Post
hi justin.
its been a while,but the the brain has been bussy
i agree that using more smaller subs is the way to go.

i designes a 350 ltr cab with the eminence,and a 280 ltr cab with 2*
b&c 12 lw 801
Click the image to open in full size.
ill look into your design now.
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Old 19th April 2011, 02:32 PM   #213
epa is offline epa  Netherlands
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hi justin
it is 4 boxxes with 2 speakers each so 8 in total
no free lunch
i think it was an 18 sound driver if i remember correct.
the "good" thing about this design is,because its a single fold,it doesn't loose much volume in the corners(only 2 corners), less destortion ,and simple bild.
you could try some other 12 inch wich is availeble on your side of the pond.

Last edited by epa; 19th April 2011 at 02:38 PM.
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Old 22nd April 2011, 10:41 AM   #214
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Quote:
Originally Posted by Xoc1 View Post
I suppose that the overall limitation would be what size events you are trying to cater for. Four of the large cabinets in a row would be impressive if your prepared to transport that volume of speakers.
Click the image to open in full size.

Might you be able to shrink the size of this cab (while increasing SPL) enough to maybe hit flat-to-35Hz w/4 parallel? Would this make a significant size difference?

Also, what should I look for/what's considered 'bad' in the phase and delay graphs in Hornresp? I've got a couple models that don't look too peaky and a few that spike (yikes...I assume).
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Old 23rd April 2011, 02:51 PM   #215
Xoc1 is offline Xoc1  United Kingdom
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Quote:
Might you be able to shrink the size of this cab (while increasing SPL) enough to maybe hit flat-to-35Hz w/4 parallel? Would this make a significant size difference?
Reducing the response from 30 to 35hz makes quite a size difference.
I attach my latest proposal for you.
It is based on the SS15 so I,m fairly confident that it should work OK
The size is very similar to a very famous 18" TH so it should be big enough
No apologies for using the Precision Devices PD1850 as this is the driver that I,m interested in using - I have no idea how cost effective they are on your side of the Atlantic!
Still within Xmax at 80V down to 31Hz so a fairly low hi-pass would be OK.
Hornresp info for 1 and 4 cabs also a PDF with more than enough info to make sawdust.
Attached Images
File Type: jpg TH18 1-off 1W.jpg (331.1 KB, 605 views)
File Type: jpg TH18 4-off 800W.jpg (369.9 KB, 582 views)
Attached Files
File Type: pdf TH18.PDF (60.2 KB, 175 views)
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Old 24th April 2011, 06:26 PM   #216
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You could also use my B- Low Rider design, it gets down pretty well flat to the Low B (32 Hz) using Peavey low rider 15s, a very good inexpensive speaker. It is a 2 x 15 design, but a 21" looks like it would almost fit.[/QUOTE]

Can you send me this plan for the low rider 15s.

Thanks man
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Old 3rd May 2011, 02:15 AM   #217
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Xoc1....any other drivers that you can model in that box? around $300usd each?
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Old 3rd May 2011, 02:34 AM   #218
Djim is offline Djim  Netherlands
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Your 3015lf for example:
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File Type: jpg JbellSS15_vs_Xoc1SS18.jpg (72.8 KB, 455 views)
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Old 3rd May 2011, 02:39 AM   #219
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I could be wrong but I don't think the specs listed in the PDF file allow for that sub to be built from one sheet of ply? Not that I'm concerned about that I was just curious
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Old 3rd May 2011, 12:32 PM   #220
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Quote:
Originally Posted by m R g S r View Post
I could be wrong but I don't think the specs listed in the PDF file allow for that sub to be built from one sheet of ply? Not that I'm concerned about that I was just curious
I was careful not to call my design SS but prefixed with TH
Where DJim refers to it as SS no doubt he is referring to the actual hornpath layout that is similar to jbells SS15. The concept was to take advantage of the SS15 hornpath, that seem to have performance advantages as discussed in the SS Challenge thread, and expand the size. Shamelessly the overall dimensions are similar to the Danley TH115/118. The idea being that this should be big enough to perform well.
As such no compromises have been made to optimise for timber sheet sizes. Instead the dimensions are set for optimal performance. The mouth being almost completely square for instance.
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