How much bass from four sealed Shivas?

[mazeroth]

I'm in the process of designing a dipole speaker much like the Orion or will be taking the route of the awesome Dayton RS dipole that Monte Kay built. As far as adding some low end to the dipoles I was thinking of building two dual sealed Shiva subs (I have 4 collecting dust) and EQing the low end with a Behringer BFD. I'd like to cut the dipoles off at 50-40hz and let the Shivas take over from there, probably with a 24db L/R filter. Essentially I'd like flat response down to at least 20hz. My room is 20x14 and I will be using a Crown XLS402A amplifier, which will do 400x2 at 4 ohms. Do you feel this is obtainable?

Thanks!

[BassAwdyO]

I feel that it is attainable...

[simon5]

In a small room, the subwoofer I built with a single Shiva vented can get 116 dB in room SPL at one meter at 16 Hz with 250W.

With 4 sealed shivas and 800W, you're ok my friend hehe!

[morbo]

if you want to be flat to 20hz though, you may need some EQ. I have a sealed shiva in a small room and it rolls of fairly rapidly below 30hz.

[mazeroth]

Yes, I will be adding EQ to them with the Behringer Feedback Destroyer Pro. I really don't want to have to port them, due to a much larger box and sound I don't care for, but I would love for them to be able to handle both music and HT responsibilities very well.

Do you feel 20hz is a good thing to shoot for, or would 25 fair almost as well?

[wingman]

20 Hz well be just fine !

I have a sub with four JBL infinity 10" in 13L a pices sealed.
(It´s the same as in JBL PS-10)
I use Eq on them an the go flat to 20hz with no problem, but you may want to roll them off below 20 hz as i do.

[roddyama]

You can use Small's chart post here by Kelticwizard to determine how much power you would be able to produce for a given x-max and cone area. Of course you'll also have to have the power to drive the speakers to x-max.