[azryan]

Should be dirt simple to turn a box plan for one driver and pas. rad. into two driver and two pas. rad.

Should just need to make one of the dimensions twice as and probably add a window brace in the middle -pretty much as if you just glued two single driver boxes together.

Along these same lines for say a tower of 4 of these bad boys.... or two towers to be nice and symetrical. hehe

[doug s.]

i'd be interested in keeping only one passive w/two actives...

doug s.

Should be dirt simple to turn a box plan for one driver and pas. rad. into two driver and two pas. rad.

Should just need to make one of the dimensions twice as and probably add a window brace in the middle -pretty much as if you just glued two single driver boxes together.

Along these same lines for say a tower of 4 of these bad boys.... or two towers to be nice and symetrical. hehe

[Andrikos]

Sorry if I missed it, but is there a price announced yet?
I'd like to buy a couple to mate with my DIY line arrays.

Danny, would you recommend against attaching the 150lbs each line arrays on top of the subs?
Would that be a bad way to go about it?
Thanks,

[Rory B.]

XW12 - High Excursion SQ Bass Driver
XR12 - High Excursion Passive Radiator

The "BassTopia" High Fidelity Bass System BT12

w00t.

As for two actives with one passive, that's a bad idea. There always needs to be twice as much volume displacement from the passive radiators as there is from the active driver.

[doug s.]

...As for two actives with one passive, that's a bad idea. There always needs to be twice as much volume displacement from the passive radiators as there is from the active driver.

then how come my vmps larger subwoofers sound so phenomenal, w/a 12" & 15" active, & one slot-loaded 15" passive?

doug s.

[azryan]

"-As for two actives with one passive, that's a bad idea.-"

I agree and really... why the desire not to have two pas. rads.? To save $50 and a bit of router work on the cabinet?

[doug s.]

"-As for two actives with one passive, that's a bad idea.-"

I agree and really... why the desire not to have two pas. rads.? To save $50 and a bit of router work on the cabinet?

i disagree, & i would prefer a potentially smaller cabinet, w/use of two active & one passive driver.  it's a size thing - if i were not concerned w/size, i'd yust stick w/the vmps larger subs.  which are big enuff as it is, w/only one passive radiator...

ymmv,

doug s.

[wje]

because every monkey knows -you should stay up in your funken tree

Nice quote.  

Actually, I just has the DMB "Live at Folsom Field" in the DVD player and played "Big Eyed Fish" - such a great song.

[Danny Richie]

i'd be interested in keeping only one passive w/two actives...

Hi Doug,

One PR would not be enough in this case for two woofers.

That would be a little like making the port to small.

Sorry if I missed it, but is there a price announced yet?

I am thinking starting those woofers out at $99.50 each and the PR's at $44.50 each.

Danny, would you recommend against attaching the 150lbs each line arrays on top of the subs?

The best place for your subs is not necessarily the best place for the main speakers or vice versa.

Keep them separate and leave yourself some versatility.

As for two actives with one passive, that's a bad idea. There always needs to be twice as much volume displacement from the passive radiators as there is from the active driver.

Yep, something like that.

The X-max on the PR is pretty huge and only limited by the suspension which uses an inch and a half rolled surround.

then how come my vmps larger subwoofers sound so phenomenal, w/a 12" & 15" active, & one slot-loaded 15" passive?

A 12" and a 15" in the same box and/or air space? really?

[pjchappy]

From this picture:

it looks like the 15" active and 15" PR could be separated from the airspace of the 12".  Someone will have to ask Big B, or someone who has put this together in kit form.


p

[rosconey]

nothing between the 12 and 15-

[Andrikos]

I am thinking starting those woofers out at $99.50 each and the PR's at $44.50 each.

NIIIIICE!  
I was ready to plunk some cash down for a pair of Dayton IB 15"s but the GR woooofers sound mighty good!
I already imported the parameters in ISD and this is what I got for sealed:
 Volume = 1.857ft^3, Frc=37.4Hz, Qtc=0.758. Nice Q with low volume but the tuned frequecny is quite high.
2.6ft^3 is pretty nice for 20Hz tuning with the passive radiator.

Danny,
Do you have a 15" version in design btw? I wouldsn't mind using a couple of those in isobarik format for a 15ft^3 birch coffee table I have in mind doing? That would be sweet!

Thanks for the advice!

[Danny Richie]

Danny,
Do you have a 15" version in design btw? I wouldsn't mind using a couple of those in isobarik format for a 15ft^3 birch coffee table I have in mind doing? That would be sweet!

Nope, I am only going to do a 12 incher for now.

15ft^3? You could just about put six of my 12's in there with PR's.

Now that would move some air.

[Andrikos]

   
Six of them eh...?
Tempting but rather pricey I'm afraid for 6 subwoofers and 6 PR's...  

I'm leaning towards "small" 2.6ft^3 GR 12" woofers/PR's for each of my Line Arrays for stereo woofin' and a couple of 15" IB's in isobarik sealed in the 15ft^3 coffee table for sub out HT duties!  

[wje]

Tempting but rather pricey I'm afraid for 6 subwoofers and 6 PR's..

$900 for drivers and PRs isn't so bad - when you look at what you're getting to move the air ... in addition to an eviction notice.

[Danny Richie]

Six of them eh...?

Well if you have that much air space to work with...

Tempting but rather pricey I'm afraid for 6 subwoofers and 6 PR's...  

Well maybe compared to only one pair of 15's.

So space is a consideration for the front subs but the coffee table has to be big enough for a couple of dinner plates, drinks, and a stack of remote controls, plus hold them up to the right height, eh....  

So for the coffee table space is not as big of a concern as price. Hmmm, I have no good answer.

Hey, how about 2 of my 12's with PR's. You won't spend to much,  and you still have room for a cooler full of beer in the coffee table too?  

Okay, I better get back on figuring out the name and model numbers. Any more ideas to consider?

[azryan]

Someone can set up a pair of subs to 'look' like they're stereo, but the waves are so HUGE and totally non-directional that they aren't stereo.

I've got dual subs and have tried them in dual corners and together and find putting them together gives a tighter sound and will make the output the loudest making the dist. and amp needs the lowest.

Also like Danny also pretty much said sub bass and everything above it are like two diff. animals.
Optimal pos. for a pair of speakers is typically not optimal for a sub.

Corner loading isn't always the best, but it's usually the best IMO.

Just some thoughts in general about thinks to think about before someone decides how many direvers needed and where they'll go. Placement can be worth more to output and musicallity than adding drivers.

[Andrikos]

Ok, how about "GRaceful" for a name?
Since you don't necessarily love huge Xmaxes and stuff like that.

[azryan]

"-Since you don't necessarily love huge Xmaxes and stuff like that.-"

Wow, I didn't realize 16mm XMax was small to you. 12's with a lot more cost a LOT more from what I've seen, and are the most extreme long throw designs out there I thought.

[Danny Richie]

Since you don't necessarily love huge Xmaxes and stuff like that.

Don't get me wrong. I have nothing against long X-max's.

That is kind of like having an amp with a lot of head room.

I just believe that if your focus is on sound quality you don't drive woofers to their limits.

If you need to move more air than half the capabilities of a woofer then use two, or even better, four.