Who makes the lowest distortion pro-sound subwoofers? - Page 4 - diyAudio
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Old 26th February 2008, 08:55 PM   #31
MaVo is offline MaVo  Germany
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five way indeed, i am amazed

well, you could loose one or two ways without getting into compromises too much.
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Old 26th February 2008, 09:23 PM   #32
thadman is offline thadman  United States
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Quote:
Originally posted by MaVo
five way indeed, i am amazed

well, you could loose one or two ways without getting into compromises too much.
Probably, but we might run into power response aberrations.

4-way for music, 5-way for HT
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Old 2nd June 2008, 11:07 AM   #33
iand is offline iand  United Kingdom
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Quote:
Originally posted by iand
If you're looking for a pro-audio subwoofer -- one that won't run out of linear Xmax at full power down to (say) 30Hz or below -- there are few choices.

Taking linear Xmax as (Hvc-Hg) and mathematical Xmax as Hvc-3Hg/4 (estimated to agree with DUMAX or Klippel Xmax), we have in order of descending mathematical Xmax (which is what most manufacturers quote):

1. Aura 1808/Seismic 8196 : 100mm underhung 25mm Al coil in 50mm gap
-- linear Xmax 13mm, mathematical Xmax 19mm
-- replaced the 6174 (see below), has lasted me for several years now
-- extremely expensive

2. McCauley 6174 : 100mm overhung 40mm Al coil in 10mm gap
-- linear Xmax 15mm, mathematical Xmax 17.5mm
-- relatively low BL, I fried one of these with repetitive 25Hz bass
-- very expensive, needs huge box

3. BMS 18N850V2 : 100mm overhung 38mm Cu coil in 12mm gap
-- linear Xmax 13mm, mathematical Xmax 16mm
-- just plain expensive, I will use this next time (since I need 4 drivers)

[snip]

Overall I'd say the BMS18N850V2 is the best bet -- the V1 has higher BL and Mmd which again makes it less useful except in a very big horn.

Ian
A new possibility for the top of the list:

0. BMS 18N860 : 100mm overhung 50mm Cu coil in 12mm gap
-- linear Xmax 19mm, mathematical Xmax 22mm
-- 1500W continuous power handling

http://bmspro.com/18N860.bms_18n860_woofer.0.html

This is way out in front of any other (available) pro-audio sub as far as Xmax is concerned (the PASUB drivers -- which may be vapourware -- are 20mm mathematical Xmax).

Ian
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Old 2nd June 2008, 01:07 PM   #34
MaVo is offline MaVo  Germany
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Is it allready released? I cant google places to buy it and the pdf says "preliminary".
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Old 2nd June 2008, 02:56 PM   #35
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Default 12Pi basshorn subwoofer



Forgive me for "tooting my own horn" but the plans are available free of charge for the DIY community. I'm not sure if that makes it OK to post information about it or not. If not, moderator, please feel free to delete this post.

The 12Pi basshorn subwoofer throws everything at the problems of distortion, efficiency and thermal management. It uses push-pull drive to reduce distortion, horn loading to increase efficiency and reduce distortion and cooling plugs to keep the motors cool. The cooling plugs reduce compression and electro-mechanical parameter shift and they increase system reliability. The 12Pi basshorn is a big cabinet to be sure (45x45x28), but it's hard to beat in terms of high efficiency, high output and low distortion.

Specifications, plans, and information can be found at the following link. There's a lot of information there, technical discussions, response and distortion charts from outdoor measurements at various power levels (up to maximum), assembly write-ups with pictures, Hornresp models, etc. So browse through the links, there's a wealth of measurement data there, not just models or plans but also real performance data.

Click the image to open in full size.
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Old 2nd June 2008, 10:06 PM   #36
iand is offline iand  United Kingdom
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Quote:
Originally posted by MaVo
Is it allready released? I cant google places to buy it and the pdf says "preliminary".
I don't know about the availability, the preliminary data sheet has only just appeared on the BMS website But I'm sure they'll tell you if you ask them, they've been helpful with both technical and supply information when I've asked them in the past.

Ian
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Old 3rd June 2008, 12:01 AM   #37
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Use a hammer for hammering, right? Pro woofers are great 'til about 30-40Hz... That's not to say that they aren't great subwoofers, but they aren't designed for it.
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Old 3rd June 2008, 11:58 AM   #38
MaVo is offline MaVo  Germany
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454Casull, please elaborate. Why could a driver not be appropriate for a certain frequency range, given that it has fitting ts paramters?

iand, thanks
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Old 3rd June 2008, 01:50 PM   #39
tinitus is offline tinitus  Europe
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I agree that sub is a relative term ... in the pro world it means 40hz with 150db they dont want too low frequencies which means excessive Xmax at high SPL ... although a BIG tapped horn with MULTIPLE hifi drivers would solve that ... I believe Tom Danley have built one into a big container ... I thought it was a joke when I first saw it, but it probably makes perfectly sense
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Old 3rd June 2008, 03:35 PM   #40
DaveCan is offline DaveCan  Canada
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How about these, they're cheap and one could use multiples for low distortion.. http://www.madisound.com/catalog/pro...oducts_id=1768

Dave
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