15" Bass Driver for OB (40-200Hz) - diyAudio
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Old 27th March 2007, 05:55 PM   #1
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Location: Brooklyn,NY
Talking 15" Bass Driver for OB (40-200Hz)

I'm building B200 OBs so i need to augment it with 15" OB woofer (doing 40-200Hz duty). It will either be just a plain small baffle or a stuffed U baffle.
My room is 16'x11'x9' with speakers along a longer wall (1-2' off the back wall) so I'm wondering if i should buy 1 or 2 woofers per side? I'm a bit of a "fast+clean bass" head but i don't listen too loud, i just want doublebass to sound like it should. I'm SO tired of boomy bass with my room modes and TL sub. I have active XO + EQ so matching SPL is not a problem.
Music preferences are mostly Jazz, Prog. Rock.
Here are my options:

Eminence Alpha-15A $59
*Frequency range: 46-3,500 Hz
*Magnet weight: 25 oz.
*Fs: 41 Hz
*SPL: 97 dB 1W/1m
*Vas: 9.2 cu. ft.
*Qts: 1.26
*Xmax: 3.8 mm
http://www.partsexpress.com/pe/pshow...07&ctab=2#Tabs

Eminence Delta-15LFA $96
*Frequency range: 42-3,200 Hz
*Magnet weight: 56 oz.
*Fs: 41 Hz
*SPL: 96 dB 1W/1m
*Vas: 6.6 cu. ft.
*Qts: 0.58
*Xmax: 4.8 mm
http://www.partsexpress.com/pe/pshow...17&ctab=2#Tabs

Knight-15 $50
Frequency Response: 35 to 4500hz
FS 35 hz
VAS 4.48
Qts 1.006
Xmax 4.5mm
Magnet weight: 50 oz.
http://www.musicsupplycenter.com/Pro...Code=813%2D013

Warrior-15 $35
Frequency Response: 35 to 4600hz
FS 36 hz
VAS 8.29
SD 143.13
Qts 0.826
Xmax 4.5mm
Magnet weight: 50 oz.
http://www.musicsupplycenter.com/Pro...Code=813%2D021

Mach MAW-15 $79
Fs = 26 Hz
Qts = 0.32 (Using only 1 VC increases Q)
VAS = 129 litres
Xmax = 13 mm
http://www.mach5audio.com/index-2.html

And of course:
Silver Iris Augie $150
Fs: 27.0 Hz
SPL: 88.7 dB 1w/1m
Qt: 0.92
Vas: 250.3 liters
Xmax: 7.15 mm
Magnet weight: 67ounces
http://www.hawthorneaudio.com/drivers.htm

Can Qts be too high?
Visaton BGS 40 has Qts 0.4
http://www.visaton.de/en/chassis_zub...r/bgs40_8.html
and people reported it sounding very good in OB while at the same time MJK really liked Alpha15A for their high Qts=1.26.
http://www.quarter-wave.com/Project07/Project07.html

I chose drivers with accordion surrounds since I believe low excursion sounds more accurate but will 3.8mm Xmas be enough? (Alpha15)

And finally the $300 question should i bother with all these cheap drivers of just get 2 Augies and a peace of mind? But then maybe at such price i should be looking at better drivers than Augie?

I wanted to save money with Alpha15 but if I need 2 of them to match the capability of 1 Augie then i'd rather get Augie ?!?

Suggestions?

Thank you.
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Old 27th March 2007, 06:53 PM   #2
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Here is another driver that i read very good review about:
GOLDWOOD GW-1558 15" PRO WOOFER $45
* Frequency response: 31-2,500 Hz
* Magnet weight: 50 oz.
* Fs: 31 Hz
* SPL: 95.6 dB
* Vas: 14.19 cu. ft.
* Xmax: 3.9mm
* Qts: .63
http://www.partsexpress.com/pe/pshow...number=290-384
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Old 27th March 2007, 11:53 PM   #3
tinitus is offline tinitus  Europe
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This MAXprofessional PR20120 is not exactly cheap, but on the other hand its a 20" and looks interesting fore dipole
Its a canadian, so you should be able to find it somewhere

http://www.pa-direct.co.uk/driverpdf...6.5neo_mid.pdf

That WARRIOT-15 do look nice and a could be a bargain at 35 USD, and might work fine if it dont distort too much
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Old 28th March 2007, 12:11 AM   #4
ttan98 is offline ttan98  Australia
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Martin King uses Eminence Alpha 15" with good result, visit his website and read his explanation.
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Old 28th March 2007, 05:13 AM   #5
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Thanks everyone for your input,
Ciares seem fishy and even more expensive than Augie. Augies to me right now seem like perfect OB drivers so if I were to splurge $300 i'd get them, anything more expensive is not necessary.
However the main point of this post is to get my feet wet with OB bass so i highly desire to get some *excellent* drivers in $50 range.
I'm sure if i really like what i hear i'll buy Augies in couple of months and use the less expensive drivers to make a ripole sub, so they won't go to waste.
However Knights and Warriors seem to 'scream' BAD QUALITY (glue on 50% of drivers' surrounds) and most specs lie.
Right now it seems i have 3 major contenders based on different recommendations i read:

GOLDWOOD GW-1558 $45 Qts:0.67
Pyle PPA15 $47 Qts:0.67
Eminence Alpha-15A $59 Qts:1.26

I always felt that Alphas had a weak motor and weak surround and Dick Olsher confirmed my suspision when he said that Q factor was just too high -> less control, all in a race for lower extension. I don't want that. So I think i'm ruling out Alphas due to their 'too high' Qts and weak damping. He also mentioned that Q factor should be closer to 0.6 (he even damped Augies with 25Oohm resistor Surprised).
http://www.enjoythemusic.com/magazin...er_project.htm

I've seen PPA15 being used for U,H dipole, ripole sub (<80Hz) duty by several people over the years on different boards but i just have a 'gut feeling' they ain't good in midbass region. (from someone's comment of their rising, bumpy response higher).Plus i just feel a driver with cheesy picture on the front can't sound good up higher.Smile

Brad convinced me from his 'extreme' testing that Goldwoods can take a beating and sound great (and he is hard to please he says) :
http://www.hawthorneaudio.com/forum/...oor+mans+augie
So at least I'm not worried about Xmax there. I don't know anything else about these drivers (manufacturer doesn't even provide freq. plot) but for some reason i'm still drawn to them. I've heard about the other 2 drivers but i learned about Goldwoods just today and yet after Brad's review i feel they deserve a chance. I' falling for them right now the most. Embarassed
PS: Both PPA15 and 1558 have Qts:0.67 just like Dick Olsher recommended.
BTW i've read that Eminence posts it's Xmas peak values so Alphas 3.8mm is in fact 7.2mm total.
I suspect that PPA15's 6mm is total while i'm not sure about Goldwood's 3.9mm.(i hope it's only one way) But from the review it seems that's more than enough for them.

What do you think?
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Old 28th March 2007, 05:39 AM   #6
Pano is offline Pano  United States
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I use the Selenium 15PW3 on my "Lounge Lizard" OBees. Very nice driver. QTS of .6 which gives a nice combo of bass and control in OB. The driver does well up into the midrange, tho I don't use it here.

http://www.partsexpress.com/pe/pshow...=264-338&DID=7

Needs about 6~8dB bass boost on my baffles.
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Old 28th March 2007, 05:48 AM   #7
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panomaniac,
How is the extension on that Selenium? I've been looking at it too.
It says Xmax of 3mm. Is it one way or both? Is it enough? How loud can you listen till distortion kicks in?
Bass Boost is fine everything is active.
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Old 28th March 2007, 03:22 PM   #8
DeonC is offline DeonC  South Africa
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Default How about a Zalytron 12" woofer?

Zalytron has a 12" woofer called the 1200CP. Specs are an Fs of 18.75Hz, a Qts of 0.678 and an efficiency of 89dB/w. It sounds like it could be really nice. And at US$45-00 it is right in your price bracket. Have a look (it is second from the bottom):
Zalytron Woofers page

Enjoy,
Deon
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Old 28th March 2007, 04:15 PM   #9
tinitus is offline tinitus  Europe
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If I should choose one of the two Emminence, my pick would be DELTA-15LF(A)

KAPPA-18 looks better with low Fs=28hz, allthough a bit expencive it would be my choice rather than double 15" with higher Fs

"Augie" has lost a lot of sensitivity, and they must calculate with plenty of room gain
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Old 28th March 2007, 04:29 PM   #10
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Very interesting suggestions guys
Thank you,
Looking into them...
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