15" woofer in sealed enclosure - diyAudio
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Old 15th January 2008, 08:43 AM   #1
KCCT82 is offline KCCT82  United States
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Default 15" woofer in sealed enclosure

Hello, can anyone suggest some high quality 15" woofers for sealed enclosures? Specifically reproducing between 50hz-200hz in a 6 or less cubic ft sealed enclosure.

I have subs for 20hz-50hz. This will be a 5 way system all sealed hoping to achieve 20-20k flat with 90+ sensitivity. I can spend about $400 USD per woofer. Thanks!!
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Old 15th January 2008, 09:48 AM   #2
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JBL 2225 (recent but obsolete) or 2226(current model). 2225 commonly found second hand, thousands and thousands were made and used for professional applications.

See, for example, http://www.usspeaker.com/JBL%202226h-1.htm
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Old 15th January 2008, 09:55 AM   #3
KCCT82 is offline KCCT82  United States
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Thanks PigletsDad, the jbl 2226 were the first I looked at, but when I plugged them in winisd they drop like a stone in sealed enclosures. I hope to get something that will stay flat from 50-200hz (within -3db at 50hz). Is what I'm asking for even possible? I will be using EQ to flatten it out a little, but I don't wanted to do any more than +/-3 of EQing on each driver for their assigned frequencies. Thanks a lot
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Old 15th January 2008, 10:59 AM   #4
tinitus is offline tinitus  Europe
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Usher PA or Studio 15" might do it
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Old 15th January 2008, 04:01 PM   #5
KCCT82 is offline KCCT82  United States
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Thanks tinitus, Usher PA 15" looks pretty good, -4db, if I don't find something better around that price I'll go with it.
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Old 15th January 2008, 04:18 PM   #6
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Hawthorne Audio has the augies, but I don't know if they are suitable for sealed? I have the 15" coaxials and love em

http://www.hawthorneaudio.com/catalo...products_id=19

I know a high Qts makes for a better situation in an open baffle situation, but what will this do in a sealed?

maybe a speaker guru chime in here?
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Old 15th January 2008, 04:29 PM   #7
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You can still have too high Qts in open baffle.

When put in a box Qts is raised, so you are going to have to accept a high-Q design. This may not be as bad as it seems, even Q 1.2 the damping is on a par with a well designed as a vented box.
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Old 15th January 2008, 05:17 PM   #8
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Default TD15's

I would suggest a TD15 - a design which was originally developed by Lambda Acoustics. I have a pair in 3.5 ft^3 sealed enclosures for my dedicated 2-channel system. They are equalized to flat (in-room) at the low-end and rolled off at ~350Hz, 4th order. They have a Theil-Small efficiency of ~93 dB.

I understand that Acoustic Elegance is currently manufacturing these drivers, but I have not had any direct contact with them.

Contact information:

http://www.aespeakers.com/
John Janowitz,
Owner Acoustic Elegance LLC
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I bought my drivers used through private sale, and have an extra pair which I would consider selling. BTW, these drivers (sealed) produce the most natural and musical bass that I have heard.

Best Regards,
Edward
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Old 15th January 2008, 05:38 PM   #9
KCCT82 is offline KCCT82  United States
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Thanks

Boris_The_Blade- the speakers look good

richie00boy- is the "qts" you mentioned what winisd calls "qtc" in the sealed box calculations?

EdwardWest- thanks for the suggestion and offer, but I'll be needing 4 total...


But guys, i found this at partsexpress, when I plugged it in winisd the SEALED ENCLOSURE graph looked really good! only -2.5db at 50hz (3 cu ft. per speaker) Can someone verify this with another speaker design program? Looks too good to be true.



The Dayton Classic 15" woofer is excellent as a replacement driver or for new system design and construction. The versatile set of parameters makes it suitable for sealed or vented enclosure designs. With impressive bass performance and smooth overall response, it is an excellent choice for any DIY three-way loudspeaker project.

Specifications: *Power handling: 100 watts RMS/150 watts max *VCdia: 2" *Le: 3.20 mH *Impedance: 8 ohms *Re: 6.1 ohms *Frequency range: 20-1,500 Hz *Fs: 20 Hz *SPL: 92.8 dB 2.83V/1m *Vas: 14.00 cu. ft. *Qms: 3.05 *Qes: .33 *Qts: .30 *Xmax: 4.3mm *Dimensions: A: 15", B: 14", C: 6-3/8"
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Old 15th January 2008, 06:11 PM   #10
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Default I use JBL 2226Hs in 10 ft^3 sealed boxes

I use DSP eq to make them flat from 20Hz - 550Hz. It is more than a 3db correction, but I also do room correction which requires more than 3db anyway. They sound really great, and have incredible power handling, so the EQ is not a big deal for any reasonable volume.

Highly recommended. I'm sure they will do fine in a much smaller box, and I am planning on moving them to a critically damped box (4.5 ft^3).
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