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Old 14th August 2003, 03:26 AM   #1
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Question Best Driver for Sealed Subwoofer

I am researching sealed subs for my HT. I prefer the sound of sealed and wish to stay that route.

I have modeled Tempest and Lambda SB15 drivers with good results but I would like to hear real world results. Good experience with either driver in a sealed config? What alignment? I planned on 0.57 for Tempest but 0.9 for Lambda due to box size.

I am looking for good flat response as close to 20 as possible in room. I cant seem to match some of the results from Adire's website with their boxes, but I trust their designs.

Any thoughts welcome including other driver recommendations.

Thanks!
Jim
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Old 14th August 2003, 04:05 AM   #2
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I have no reservations about recomending the NHT 1259:

http://www.madisound.com/nht1259.html
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Old 14th August 2003, 04:07 AM   #3
GM is offline GM  United States
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You'll need to either know your room gain curve or build a flat enough sub that goes low enough to be able to attenuate to suit for low distortion. A 0.9 Qtc is too high.

The Northcreek Leviathan in 15ft^3 net is the 'best' of the ones I'm aware of, but dual Tempests in 7.25ft^3 net works pretty good for a typical HT room.

GM
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Old 14th August 2003, 04:15 AM   #4
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There's a great deal of enthusiasm over the Adire DPL-12 in a sealed ~77 liter enclosure. It's currently on sale for the same price as the Shiva ($125 US) via Creative Sound.
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Old 14th August 2003, 04:26 AM   #5
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I looked at the DPL12...I noticed it was very inefficient...........true?
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Old 14th August 2003, 01:34 PM   #6
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Quote:
I noticed it was very inefficient...........true?
arent they all? 88db/1watt range


sealed box system-inherently inefficient.

everything has a bad side too
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Old 14th August 2003, 02:37 PM   #7
Mark Kravchenko --- www.kravchenko-audio.com
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Default sub versus efficency

The awfull truth about drivers is that to get a good bass response out of a small box you need a large moving mass. That inturn will limit the overall efficiency of the driver. A stronger motor structure will start to pinch off the low end. One balance against the other.

Why not look at the peerless drivers in the xls series??
I find that the audire driver specs are optimistic at best. See the linkwitz lab site for a thorough review of drivers and their salient parameters for his thor subwoofer. It may open your eyes with some more knowledge and your horizons for more drivers. Don't rule out cheaper multiple drivers set up in a non optimal box and then equalised as well. The possibilities are endless.

Mark
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Old 14th August 2003, 11:56 PM   #8
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Quote:
I find that the audire driver specs are optimistic at best
This is the second time this week I've seen a posting from someone questioning Adire Audio's forthrightness. My experience with this company has always been a positive one. Has something happened to change that? What is it about the specs you find hard to believe?
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Old 15th August 2003, 12:05 AM   #9
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notice any power compression figures?

distortion/??

only on the tumult which is a waste of money less u have a spare 1.5kw to move it
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Old 15th August 2003, 12:52 AM   #10
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hmmmmmmmmmmm

I modeled a dual DPL12 setup and got positive results...F3 at 28hz or so and efficiency up at 90. Plus the box is pretty small at 150 liter...or about 21x21x21 (inside)...ends up at Qtc of 0.69

What is rule of thumb for packing? e.g. 25% packing and adjust the internal volume how? I also need to figure the braces and add a bit of size to compensate.

The Lambda needs too big a box and I am not sold on Tempest for some reason.

Thanks!
Jim
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