How does this look?

[breez]

Originally Posted by DaveCan

I though "Acoustic Suspension" and "Sealed" were the same thing???

Well, acoustic suspension is a sealed alignment, but sealed alignment may not qualify as an acoustic suspension system. Acoustic suspension means using a sufficently small enclosure such that its stiffness is much greater than that of the woofer's suspension. The combined stiffness/compliance is then dominated by the air which may be quite a bit more linear than the woofer's.


Is there a distortion measurement of the SDX10 woofer? The SDX15 has great output capability, but at somewhat mediocre distortion performance (see HTshack subwoofer measurements).

[DaveCan]

I seemed to of overlooked these ones that state they work in small sealed enclosures, however I could build a box the best size for sq.. Do these seem okay?

http://solen.ca/pdf/dayton/QT385-4.pdf
http://solen.ca/pdf/dayton/QT305-4.pdf

[MJL21193]

The first one - the 15" looks nice in a 60 litre sealed box (F3 = 42Hz) but looks even better in a vented box, 120 litres, F3 = 25Hz. Port would be 10cm diameter, 30cm long.
I would do the larger vented box rather than EQ the smaller sealed.

[DaveCan]

Thanks John... I want to stay with a closed box, and what about 2 of the 12'''s or 15''s one at each end? I tried to do a program, and it wants qtc which I don't see listed etc..

Any other ideas for a really high sq closed box sub, paper cone, under $300 in Canada already lol

[breez]

Originally Posted by DaveCan

Any other ideas for a really high sq closed box sub, paper cone, under $300 in Canada already lol

Why paper cone? If a ~100-150L box isn't an issue, take a look at Dayton RSS390HF (209 canadian at solen.ca). It is a high quality woofer with emphasis on reducing distortion arising from non-linear inductance and flux modulation. Not sure how the HO-models perform, they require a smaller box.

Have a look at my measurements (logsweep, ground plane 2m) to see performance in a small box. This box size and resulting Q and high power requirement is probably not your cup of tea, but I'm ultimately using Linkwitz transform and room EQ anyway.

[MJL21193]

Originally Posted by DaveCan

Thanks John... I want to stay with a closed box,

If you don't mind my asking: Why? A properly designed vented sub will outperform a a sealed sub by a wide margin as far as actual bass production is concerned. Making the box bigger and the added complexity of installing a port are the only valid trade offs.

I use Unibox to model speakers. It is very good and very accurate once you learn how to use it and it uses the standard T/S specs.
Qtc is the Q of the designed sealed box - for smoothest response it will be .707.

[DaveCan]

I prefer sealed or closed is all The requirements for me are sq, not high spl, low level listening detail, and I prefer paper cones or a blend thereof etc.. Just my usual preference and what I'd prefer etc...

[Cokewithlime]

If you are stuck on the idea of a sealed sub, have a look at the Peerless 830845

Solen has a kit listing for it as well as reference PDF of the enclosure

[MJL21193]

Ok then...

[DaveCan]

That solen kit and the woofer mentioned is alu coned.. I had thought surely there must be a really good sq closed alignment design using a paper coned based woofer still? And no I didn't mean Shirley lol.. Thanks for all the help and ideas...