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Old 28th December 2012, 02:15 PM   #61
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Hey Guys,
In keeping with the Martin-Audio tradition try this : Professional Loudspeaker Systems. Martin Audio Ltd.
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Old 28th December 2012, 10:18 PM   #62
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Quote:
Originally Posted by Inductor View Post
I only know Wayne's sub (2x12"). I don't know if it can compete in the same race. He and Danley are two best designers.
Bass Horn subwoofer
AudioRoundTable.com: Pi Speakers => Pi 12 sub plns please?
Here's Wayne's measurement of his sub. This measurement is at 10 meters; add twenty dB to compare it to 1M measurements. This is with 2400 watts.

Click the image to open in full size.

Here's my sims of the McCauley M421 and TH-Mini. Note that this is a *sim*, and the mini is getting more watts than it can physically handle.
Click the image to open in full size.

Some observations:

1) th-mini is crazy sensitive considering it's footprint. I can see why Danley moved away from front loaded horns. Even if the output per cubic foot was identical, the tapped horns are much much easier to manufacture
2) Wayne's sub detonated during testing, with 2400 watts.
3) The McCauley sub goes lower than both, but WOW is that a big heavy expensive box. (The drivers alone cost $3400 versus about $203 for a TH-Mini and about $330 for the Pi sub)

One thing that's a bit of a mystery to me is why the rolloff of the tapped horn is shallower than the sims would predict; sims say 24dB per octave but Jeff Knorr's measurements are showing about 12dB per octave. Odd.


Last edited by Patrick Bateman; 28th December 2012 at 10:36 PM.
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Old 28th December 2012, 11:18 PM   #63
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I had to show this...the mother of all subwoofers





THE BIGGEST HORN SUB OF THE WORLD by Roberto Delle Curti ITALY
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Old 29th December 2012, 12:14 AM   #64
NEO Dan is offline NEO Dan  United States
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Quote:
Originally Posted by Original Burnedfingers View Post
I had to show this...the mother of all subwoofers





THE BIGGEST HORN SUB OF THE WORLD by Roberto Delle Curti ITALY
Wow, I haven't seen this posted....



this week
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Old 29th December 2012, 04:52 AM   #65
Phil B is offline Phil B  Australia
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I`d say for "long throw " ( whatever that is !) then a block of 8 Terrahorns has always impressed me by how damn far the sub travels!

The Terrahorn

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Old 29th December 2012, 08:23 AM   #66
epa is offline epa  Netherlands
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if you want long throw,just make a endfire aray.
patrick,i'm intrested in the hr inputs of the mcauley ,if you have them?
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Old 29th December 2012, 07:03 PM   #67
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Quote:
Originally Posted by Patrick Bateman View Post

3) The McCauley sub goes lower than both, but WOW is that a big heavy expensive box. (The drivers alone cost $3400 versus about $203 for a TH-Mini and about $330 for the Pi sub)

One thing that's a bit of a mystery to me is why the rolloff of the tapped horn is shallower than the sims would predict; sims say 24dB per octave but Jeff Knorr's measurements are showing about 12dB per octave. Odd.
The M421 drops off at about 36 dB per octave below Fb.
The lack of coherency (red line) indicates the bump at 16 Hz is from some outside noise, probably wind or a passing truck.

Art
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Old 23rd May 2014, 01:56 AM   #68
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Hi! It's been ages since I've been on this forum. I saw this thread a while now and have always wondered if a single 18" horn can be modeled using the same folding as the Martin audio 215 mk III with consideration given to the mouth size since it will use only a single driver. I I haven't been around to using horn response so I would really appreciate some help. I have heard the mkIIIs and I totally agree that the bass is truly gut wrenching.Martin 215 mk 2 - Speakerplans.com Forums - Page 20.... A decent driver I might say http://www.rcf.it/products/precision-transducers/low-frequency-transducers/l18p400...

I had the help from Neo Dan with my last two subs and is still very happy with them. I just want to explore a bit more on something new...
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Old 26th May 2014, 12:29 AM   #69
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Well I guess I didn't make sense at all!!! LOL !!! Click the image to open in full size.
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