Which 15 or 18 ınch woofer- best for open baffle

[ayhan]

I Need 15 or 18 ınch Sub Bass for Open baffle I prefer RCA -B&C or BEYMA ( I can find easy in our country)
Will you please send me your comments...

 

[_henry_]

well if u go active and have space, most of them will perform well i think

cheers
henry

 

[CharlieLaub]

I Need 15 or 18 ınch Sub Bass for Open baffle I prefer RCA -B&C or BEYMA ( I can find easy in our country)
Will you please send me your comments...

None of these!

All of the pro drivers from these companies (as far as the models that I am aware of here in the US) have Qts that is too low and Fs too high for open baffle use. Look for drivers with Qts of 0.5 or higher. The exception would be if you can connect them to an amplifier with controlled output impedance, and set that to some "high" value (e.g. 8+ ohms) to cause Qts to increase.

Have you seen the studies of open baffle speakers by Martin King?
http://www.quarter-wave.com/OBs/U_and_H_Frames.pdf

He uses Eminence drivers (Alpha 15) with Qts > 1.0 with very nice results. Can you get those in your country?

-Charlie

 

[RockLeeEV]

Perhaps:

EMINENCE DELTALITE II 2515 - Thomann UK Cyberstore

Another suggestion:

AE Speakers --- Superb Quality, Unforgettable Performance, Definitely.

 

[ayhan]

Thanks Friends,
I can find Eminence I will send order Alpha 15 to distributor tomorrow but There is no distributor AE Spekers

Thanks again

 

[milen007]

hi guys. i am looking for other suggestion on this topic as well. i cant find the eminence alpha 15a locally. any similar driver suggestion?

sorry to bring up and old thread.

regards
erwin

 

[Kjeldsen]

here you will find OB from troels graversen with eminence low Qts and high fs in OB

OBL11

Also the Dali Skyline 2000 used a low Qts 15" Cerwin Vega woofer in OB

 

[milen007]

hi Kjeldsen

thats great info. i will check those drivers out. any other woofers suggestions?

thanks
erwin

 

[Assesears]

Hi

Don't use the alpha 15a only if you want one note bass. The magnet
is to small. I will be selling mine soon hate them

RegardS

 

[brianco]

Check out this site:

speakers, DIY, projects

I can't guarantee any of it, but it is interesting.🙂

 

[milen007]

hi Assesears

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

thanks
erwin

 

[Assesears]

Yes I would call it muddy, boom boom if you like that sort of thing
go for it. Give me a headache though.

 

[Assesears]

I not convinced about the high qts needed for
OB need more magnet, so will be looking for something with qts <1.

Regards
Bruce

 

[DogStar]

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

 

[Telstar]

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.

 

[siruis815]

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.

 

[Kjeldsen]

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

 

[Kjeldsen]

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.

 

[Jeroenkv]

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.

 

[ScottG]

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.