[oz_audio_todd]

If one was going to build sub box stands for for either the XL-S or the NX's (etc) containing 4 of the same drivers, would one be better to make them into a single box air space for all 4 woofers with a single port, a double box air space with 2 ports (one for each pair of drivers) or a quad version (with 4 seperate air spaces and 4 ports) and why?
Or as usual, is it not that simple???   
Ta 

[mrhyfy]

For best low end response my guess would be 2 on the front, 2 on  the back wired out of phase.Sealed box.

[Danny Richie]

You could put 2 on the left and 2 on the right.

I have some 8" X-Sub's if you want. I could let 8 of them go real cheap.

[oz_audio_todd]

Yes, I do like the concept of opposed subs (out of phase though????) but was thinking of something a little more like the bass section of the OB-7.
Hmmm.. why sealed? Would it give me all that much more than the ported bookshelf speaker its trying to assist? (or would It be best to also run sealed 'satelites'?)
What do mean by "2 on the left and 2 on the right"?
Ooooow! what is an X-sub??
Just to let you know though, that the application I am thinking of is a LCR set up with the 3 bookshelves, with 4 small drivers below the L & R (like the OB-7) as a stand and 2 drivers each side of the C.
Pretty sure my application wont fit 8's in the holes for the centre (but you might not have 12 anyway?)     
thanks guys 

[Danny Richie]

X-Sub: http://www.goodsound.com/equipment/av123_xls_xsub.htm

You keep them in phase and place a pair on each side. Ideally, find a good plate amp to put on the back of the box with a transform circuit and leave the box sealed.

Porting the box gets pretty large by comparison. So if ported then use just two of the 8" woofer per box. They are 8 ohm woofers so you can run a pair of them off of one plate amp.

I think I may have about 20 of these woofers left.

[oz_audio_todd]

oh yeah, forgot about that 8 ohm bit (hehehehe, might have to run 2 amps a side!      seriously, thats probably going too far though)
So, found them described as "mass loaded" does that mean that they have had mass added to them to drop the frequency range and hence the sensitivity as well?
And how cheap are we talking about here?

[Danny Richie]

They are a heavy little cone and they do have low sensitivity. But two of them in parallel is not bad.

I can let them go for $25 each.

[skeeter99]

They are a heavy little cone and they do have low sensitivity. But two of them in parallel is not bad.

I can let them go for $25 each.

Danny,

Aren't these the same drivers used in the powered woofer section of my Minis?

Scott

[Danny Richie]

Danny,

Aren't these the same drivers used in the powered woofer section of my Minis?

Scott

Yep, the very same.

[skeeter99]

Yep, the very same.

Thought so. Those were great little drivers. I have no use in my townhouse for MORE subs though. Two or four of these bad boys would make for a great foundation. Pretty quick little buggers too.