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Multi-Way Conventional loudspeakers with crossovers

Which 15 or 18 ınch woofer- best for open baffle
Which 15 or 18 ınch woofer- best for open baffle
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Old 1st May 2012, 10:37 AM   #11
milen007 is offline milen007  Indonesia
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Join Date: Dec 2007
hi Assesears

is it that the alpha bass is muddy? what other woofer you have in mind?

thanks
erwin
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Old 1st May 2012, 10:42 AM   #12
Assesears is offline Assesears  United Kingdom
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Yes I would call it muddy, boom boom if you like that sort of thing
go for it. Give me a headache though.
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Old 1st May 2012, 10:47 AM   #13
Assesears is offline Assesears  United Kingdom
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I not convinced about the high qts needed for
OB need more magnet, so will be looking for something with qts <1.

Regards
Bruce
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Old 1st May 2012, 10:47 AM   #14
DogStar is offline DogStar  Europe
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Check out Beyma 18LX60V2. This driver seem to have almost perfect specs. for a LF OB. It even comes at a reasonable price.

http://profesional.beyma.com/ingles/pdf/18LX60V2.pdf
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Old 1st May 2012, 11:59 AM   #15
Telstar is offline Telstar  Italy
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Quote:
Originally Posted by DogStar View Post
Check out Beyma 18LX60V2. This driver seem to have almost perfect specs. for a LF OB. It even comes at a reasonable price.

http://profesional.beyma.com/ingles/pdf/18LX60V2.pdf
I second this. Beyma makes great woofers.
I use two 12" per side.They dont go very low, but they sound great. No problem for the low Qt.
If you have space go for 2 woofers per side in h-frame.
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Old 1st May 2012, 12:14 PM   #16
siruis815 is offline siruis815  United States
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I am by no means an expert, but a mid qts with very low fs (<30Hz) is what I'd be looking for. Much easier to find. Mms would be the third factor, depending on how high you want them to play.
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Old 1st May 2012, 12:22 PM   #17
Kjeldsen is offline Kjeldsen  Denmark
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If I didn't have eight 10" woofer already, I would consider this Fane woofer
Fane International Ltd Loud Speakers
Fane Sovereign Pro 18-800 - Thomann UK Cyberstore

Fs 34,5 Hx, Qts 0,337 and 50 Hz, and overall sensitivity of 97,5 dB
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Old 1st May 2012, 12:25 PM   #18
Kjeldsen is offline Kjeldsen  Denmark
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Quote:
Originally Posted by siruis815 View Post
I am by no means an expert, but a mid qts with very low fs (<30Hz) is what I'd be looking for. Much easier to find. Mms would be the third factor, depending on how high you want them to play.
Either very large diameter - 30" I'll guess or very heavy membrane = low SPL.

An OB will probably never go lower that 40 Hz, unless you have a very large room, and will need heavy eq., or very wide baffle.
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Old 1st May 2012, 04:33 PM   #19
Jeroenkv is offline Jeroenkv  Netherlands
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I'm using AE Speakers --- Superb Quality, Unforgettable Performance, Definitely. , in my case the LO15 a combination of a Dipole 15 motor and TD15M. This version has OB low extension and is usable to a higher crossover point than the Dipole 15 (crossing is at 800hz tot SEOS-15).

If you only need dipole base <500hz the Dipole 15 is a very good choice (I also used the Dipole 12, very good).

Also used Ciare 15NdW in the past.
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Old 1st May 2012, 04:52 PM   #20
ScottG is offline ScottG  United States
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This all depends entirely on the operating bandwidth.

The lower you go, the more excursion you need - a LOT more excursion. OR you need more surface area (..i.e. more drivers). OR of course a combination of the two. (..close-coupling to the floor can also help somewhat.)

The notion that you "need" a higher qts driver is not correct. You can also equalize the system for increased pressure at lower freq.s. You can also achieve something of a hybrid approach via a dual voice coil design. One coil gets main signal, the other gets the eq at lower freq.s..

Frankly I don't think an open baffle dipole is necessary at lower freq.s., nor have I found it to be "better". There is a tactile sensation that goes somewhat missing with an open baffle design. I prefer a transition from mid-bass to bass at around 70 Hz.
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