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Audax pr170mo Woofer selection... which 15 inch woofer 98db eff...
Audax pr170mo Woofer selection... which 15 inch woofer 98db eff...
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Old 15th June 2017, 08:59 PM   #1
youknowyou is offline youknowyou  Canada
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Default Audax pr170mo Woofer selection... which 15 inch woofer 98db eff...

hi everyone

I already have my Audax pr170mo and audax pr120 in a 30L sealed box and Im looking for a hi-efficiency woofer, around 98db eff that can reach down to f3: 35hz. im willing to use a very big bass enclosure (up to 250L) if needed.

ill use a 400hz 1st order XO

my choice so far for hi-efficiency 15 inch woofer are:

Eminence omega pro15
Beyma 15b100
Audax PR330M0
JBL 2226h

Id like more recommendations and suggestions!

my budget is max 600$ for the pair.


thanks a lot
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Last edited by youknowyou; 15th June 2017 at 09:34 PM.
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Old 15th June 2017, 09:36 PM   #2
ICG is offline ICG  Germany
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What kind of enclosure do you want? I presume BR. With the Eminence you won't get down to 35Hz/-3dB. The Beyma would, it needs ~200l for it. But you won't get 98dB on 15", the high spl is not reached in the bass let alone subbass, that's for the lower mids or higher. You can count on probably 94-95dB. If you need more, you'll need a bandpass or horn (which will be much bigger).
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Old 15th June 2017, 09:40 PM   #3
youknowyou is offline youknowyou  Canada
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thanks, I know real efficiency of the audax 170mo is about 97db so I can probably live with 95db woofer.

yes, BR enclosure... ideally if I can get -10db at 30hz im happy.

I could go as big as 300L...
I already have the eminence omega pro 15 but if there's a better woofer suited for my project, id go with something else...
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Old 15th June 2017, 09:40 PM   #4
pieter t is offline pieter t  Netherlands
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Faitalpro 15PR400 as it has very good bass-mid extension; would give flexibility to find the best crossover to the Audax mid.
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Old 15th June 2017, 09:54 PM   #5
youknowyou is offline youknowyou  Canada
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Quote:
Originally Posted by ICG View Post
What kind of enclosure do you want? I presume BR. With the Eminence you won't get down to 35Hz/-3dB. The Beyma would, it needs ~200l for it. But you won't get 98dB on 15", the high spl is not reached in the bass let alone subbass, that's for the lower mids or higher. You can count on probably 94-95dB. If you need more, you'll need a bandpass or horn (which will be much bigger).
how much would the eminence pro15 in 250L give me in Eff? would it match the Audax mid?

I give up on my first goal of f3 at 35hz, its not realistic. if I can get a -10db at 30hz im happy!
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Last edited by youknowyou; 15th June 2017 at 09:58 PM.
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Old 15th June 2017, 11:07 PM   #6
GDO is offline GDO
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Hey you guys live outdoors, on top of a cloud and cant afford any db on account of boundary economy nor room gains/placements...
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Last edited by GDO; 15th June 2017 at 11:09 PM.
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Old 15th June 2017, 11:28 PM   #7
Scott L is offline Scott L  United States
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Audax pr170mo Woofer selection... which 15 inch woofer 98db eff...
Default 15PR400

Quote:
Originally Posted by pieter t View Post
Faitalpro 15PR400 as it has very good bass-mid extension; would give flexibility to find the best crossover to the Audax mid.
This is an excellent suggestion !
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Old 16th June 2017, 05:44 AM   #8
ICG is offline ICG  Germany
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Quote:
Originally Posted by youknowyou View Post
thanks, I know real efficiency of the audax 170mo is about 97db so I can probably live with 95db woofer.
No, you don't understand. You won't get more spl per watt in the sub-bass, that's limited by the driver size. If you want more, you need a bigger driver. And no matter how much it states in the datasheet - these values in the specs only apply for lower mid on upwards because it directly depends on the geometry (cone surface Sd) of the driver.

Quote:
Originally Posted by youknowyou View Post
how much would the eminence pro15 in 250L give me in Eff? would it match the Audax mid?
The Eminence Omega Pro15 isn't a sub, it's a bass-mid driver. Even 300l will not get it much lower, especally not with with high spl. Besides that, the excursion isn't exactly huge (3,2mm).

But look for yourself:

Audax pr170mo Woofer selection... which 15 inch woofer 98db eff...-eminence-omega-pro15-br-jpg

That means, you cannot force every driver to specs they aren't made for. The Emmi will perform nice in a PA top or conservative PA fullrange, from ~60-140l.

Quote:
Originally Posted by youknowyou View Post
I give up on my first goal of f3 at 35hz, its not realistic. if I can get a -10db at 30hz im happy!
Well, it's not unrealistic. But the f3 won't be refering to 98dB, it will refering to ~95dB.

Audax pr170mo Woofer selection... which 15 inch woofer 98db eff...-beyma-15b100-br-jpg

So you see, more than 200l does not help much, no point in giving them more volume.
Attached Images
File Type: jpg Eminence Omega Pro15 BR.jpg (113.3 KB, 437 views)
File Type: jpg Beyma 15b100 BR.jpg (99.9 KB, 439 views)
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Old 16th June 2017, 05:49 PM   #9
badman is offline badman  United States
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Some of the best very efficient options that will reach low are the Great Plains Audio Altec remakes. An alternative to a single 15", since you're not stuck with concerns about directivity matching for this system, would be to use an array of smaller drivers to achieve desired F3. I like using multiples for the design flexibility.
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Old 16th June 2017, 06:29 PM   #10
Audio Elite is offline Audio Elite  South Africa
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Forget about the Eminence Drivers, go for a better sounding better performer.
+100 on the Faital 15Pr400. Stunning driver and produces stunning lower mids!!!!!!!!!!!
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