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Discussion Starter #1
Ok can anyone see amy major problems with using two 12" drivers in one box (sealed )...Oh! I must add that i'd have one driver forward facing and one rear facing..

The reason being to keep the front small on the sub.

I'll be using two boxes like that,so thats 4x12" drivers

The reason being that I plan on putting my mid/bass+tweeter in a box on top.
So really I don't want to go too large for the subs but want enough LF extension and SPL.
really wanting a solid response down below 30hz (20 would be nicer) in a very large room.

Tossing between Exodus Shiva 12"s or Peerless 12"s.
With Winisd the Peerless is needing about 100Litres as oppossed to the Shivas with nearly 200litres.

The smaller boxes would be preferable but I'm stuck with understanding the difference between gain and spl on the Winisd charts.
The Peerless looks better on the SPL chart but the Shiva looks better on the gain chart???

The system will be all active with EQ in the bass aswell.


So some help would not go astray..

Thanks!
 

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There's no problem with running a dual opposed sealed set-up. Lots of people swear by them. As you've already noted the Shiva's like a bigger air space. They will have more output at the lowest freq's though if they get the power for it. The Peerless are very nice drivers too, with just not quite as much low end grunt. If you can live with the bigger boxes I think the Shiva X's will be the way to go.
 

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Discussion Starter #3
Thanks.
Also along the way I have learned that to drivers sharing one box require less volume than two drivers with their own space,news to me but all good.

Also the cabinet vibration cancellation aspect is very appealing.

Just wondering about excess boundry gain (boom) with the rear facing drivers?

But one thing with the Shivas they seem to need twice thw power of the Peerless for any given volume.
Not that its a problem just a note
 

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Thanks.
Also along the way I have learned that to drivers sharing one box require less volume than two drivers with their own space,news to me but all good.

Also the cabinet vibration cancellation aspect is very appealing.

Just wondering about excess boundry gain (boom) with the rear facing drivers?

But one thing with the Shivas they seem to need twice thw power of the Peerless for any given volume.
Not that its a problem just a note
Have you made a decision on this yet? I have been considering the Shiva-X in a similar configuration as you are describing. I was thinking of two forward facing and two rear facing (firing against the wall). I was wondering what problems the rear firing woofers may cause as well. Any insight would be appreciated.

Mike
 
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