Which driver for a small sealed box.

ShockValue · 7th June 2005, 08:47 PM

Due to the strict guidelines set in place by my significant other, the largest enclosure I can get away with is about 1.5tft^3.This works out to be about 42 liters. Quite a bit smaller than most subwoofer drivers are designed for. Since this is my first subwoofer project, I thought it would be best to go with a sealed design.

So my question is, at this size, which driver would you reccomend?

Currently I'm toying with NHT1259 (which seems like it may be a bit dated?) and the Peerless XXLS 830845 (which says it's best in a 62L box.) I just installed WinISD as suggested on other threads, but I haven't had much luck getting it to do anything yet (I cant find either driver in it's database either.)

Am I missing any drivers that would be suitable for this? Am I just dumb thinking I can get a good sounding sub out of something this small?

My main concern is musical fedility (another reason I'm going for sealed) but it will be used for movies as well (about 50/50, but I'm much more concerned with music than movies.)

Cost of the driver isn't THAT important, so if I can spend a few more and get a much better sub, please feel free to suggest.

leadbelly · 7th June 2005, 10:30 PM

Think outside the box (no pun intended):

http://www.diyaudio.com/forums/showt...428#post222428

And don't be afraid to use the NHT. Classic drivers are just that for a reason.

ShockValue · 8th June 2005, 02:10 PM

leadbelly: thanks for the reply. I'll also check out that Adire speaker.

Someone also mentions stuffing the box to help bring down the Q. I've read that this kind of tricks the speaker into thinking it's in a bigger box, but don't quite understand how.. Is there some resource on how/why to stuff a box?

mace · 8th June 2005, 04:22 PM

Hello Shock,

You might consider the Parts Express 12" TitanicIII or the P.E. Dayton DVC 12". Both would work great in that size sealed enclosure, with the Titanic having a little more extension for extra $$$. Good luck -Mike

Bill Fitzpatrick · 8th June 2005, 04:48 PM

Why a stuffed box looks bigger:

http://www.lungster.com/l/speakers/BassListArchive.html

AJinFLA · 8th June 2005, 05:22 PM

Hi Shock,

seems like you're looking @ 12's in a 1.5ft^3 box. That's smaller than recommended, but if that's what you need take a look at these. You'll have to trade some low end extension - which may be ok if its a "music" sub. Check with Brian to be sure. I have 2 of these (both over 2ft^3). Definately a step above the staggering amount of choices of "normal" powered subs out there. Check out the "servo woofer" thread in this forum also.
My long search for a DIY sub ended here.

http://www.rythmikaudio.com/servo_product.htm

Cost is quite reasonable also!

Cheers,

AJ

AJinFLA · 8th June 2005, 05:26 PM

I should have posted this as well - for reference

http://www.hometheaterhifi.com/volum...er-4-2004.html[IMG]

http://pg.photos.yahoo.com/ph/ajinfl...6f.jpg&.src=ph[/IMG]

BassAwdyO · 8th June 2005, 06:47 PM

I'm really supprised no one has yet said this...
If you want deep bass, Two words...

Linkwitz transform

Just get a driver with ALOT of excursion and power handling and a big amp. Slap on the LT and there you go....

If you dont know what a linkwitz transform( LT) is, basically it is equalization on the extremely low end for sealed boxes. It is said to electronically change the Q of the system and lower the F3 to a point similar to a larger sealed or vented box. The only downside is power and excursion requirements, but like I said... get a sub that handles alot of power and has alot of excurison.

mace · 8th June 2005, 06:55 PM

Hello AJ

I am getting ready to build the Rythmik Servo for a music only system, and was thinking of using Brian's recommendation of 2.1f^3. Just how much over 2f^3 did you go? and why?
Thanx

RobWells · 8th June 2005, 09:20 PM

A pair of the original XLS 830500 's model well in a box just over 1.5 cuft.. push push mounting available too!

Low Q helps integrate with room gain too...

Cheers,

Rob

7th June 2005, 08:47 PM	#1
ShockValue diyAudio Member Join Date: Jan 2005 Location: Seattlish	Which driver for a small sealed box. Due to the strict guidelines set in place by my significant other, the largest enclosure I can get away with is about 1.5tft^3.This works out to be about 42 liters. Quite a bit smaller than most subwoofer drivers are designed for. Since this is my first subwoofer project, I thought it would be best to go with a sealed design. So my question is, at this size, which driver would you reccomend? Currently I'm toying with NHT1259 (which seems like it may be a bit dated?) and the Peerless XXLS 830845 (which says it's best in a 62L box.) I just installed WinISD as suggested on other threads, but I haven't had much luck getting it to do anything yet (I cant find either driver in it's database either.) Am I missing any drivers that would be suitable for this? Am I just dumb thinking I can get a good sounding sub out of something this small? My main concern is musical fedility (another reason I'm going for sealed) but it will be used for movies as well (about 50/50, but I'm much more concerned with music than movies.) Cost of the driver isn't THAT important, so if I can spend a few more and get a much better sub, please feel free to suggest.

7th June 2005, 10:30 PM	#2
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	Think outside the box (no pun intended): http://www.diyaudio.com/forums/showt...428#post222428 And don't be afraid to use the NHT. Classic drivers are just that for a reason. __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

8th June 2005, 06:47 PM	#8
BassAwdyO diyAudio Member Join Date: Jun 2004 Location: Illinois	I'm really supprised no one has yet said this... If you want deep bass, Two words... Linkwitz transform Just get a driver with ALOT of excursion and power handling and a big amp. Slap on the LT and there you go.... If you dont know what a linkwitz transform( LT) is, basically it is equalization on the extremely low end for sealed boxes. It is said to electronically change the Q of the system and lower the F3 to a point similar to a larger sealed or vented box. The only downside is power and excursion requirements, but like I said... get a sub that handles alot of power and has alot of excurison. __________________ The golden rule of DIY: Build nice, or build twice!

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8th June 2005, 02:10 PM	#3
ShockValue diyAudio Member Join Date: Jan 2005 Location: Seattlish	leadbelly: thanks for the reply. I'll also check out that Adire speaker. Someone also mentions stuffing the box to help bring down the Q. I've read that this kind of tricks the speaker into thinking it's in a bigger box, but don't quite understand how.. Is there some resource on how/why to stuff a box?

8th June 2005, 04:22 PM	#4
mace diyAudio Member Join Date: Nov 2004 Location: Oklahoma	Hello Shock, You might consider the Parts Express 12" TitanicIII or the P.E. Dayton DVC 12". Both would work great in that size sealed enclosure, with the Titanic having a little more extension for extra $$$. Good luck -Mike

8th June 2005, 04:48 PM	#5
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	Why a stuffed box looks bigger: http://www.lungster.com/l/speakers/BassListArchive.html

8th June 2005, 05:22 PM	#6
AJinFLA Banned Join Date: Feb 2005 Location: Tampa	Hi Shock, seems like you're looking @ 12's in a 1.5ft^3 box. That's smaller than recommended, but if that's what you need take a look at these. You'll have to trade some low end extension - which may be ok if its a "music" sub. Check with Brian to be sure. I have 2 of these (both over 2ft^3). Definately a step above the staggering amount of choices of "normal" powered subs out there. Check out the "servo woofer" thread in this forum also. My long search for a DIY sub ended here. http://www.rythmikaudio.com/servo_product.htm Cost is quite reasonable also! Cheers, AJ

8th June 2005, 05:26 PM	#7
AJinFLA Banned Join Date: Feb 2005 Location: Tampa	I should have posted this as well - for reference http://www.hometheaterhifi.com/volum...er-4-2004.html[IMG] http://pg.photos.yahoo.com/ph/ajinfl...6f.jpg&.src=ph[/IMG]

8th June 2005, 06:55 PM	#9
mace diyAudio Member Join Date: Nov 2004 Location: Oklahoma	Hello AJ I am getting ready to build the Rythmik Servo for a music only system, and was thinking of using Brian's recommendation of 2.1f^3. Just how much over 2f^3 did you go? and why? Thanx

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