Bi-Amp Woofers with Class D?

I am starting to think that rather than bi-amping I should consider
buying two REL T7 powered subs.

I don't bi-amp; my front speakers go flat down to 20Hz. I use the two subs to break up the standing waves in the room.

Avanti,
Wish I could post a picture. I use an equilateral triangle arrangement overall.
The speakers in the FSMs consist of a 15" coaxial and a 15"woofer
in each unit. 
Is this your question?

Atma,
I am starting to think that rather than bi-amping I should consider
buying two REL T7 powered subs.

Any thoughts on that?

what is the configuration of your speakers? 

class D offers tons of power for not a lot of space and not a lot of dollars. 
pretty good for freq below 80 hz. And if you buy a class D amp to drive your woofers, go get a big one, not something intermediate....

Works good.

My speakers are full range to 20Hz but because there are standing waves in the room, no bass at the listening chair. I installed 2 extra subs, asymmetrically placed in the room, to break up the standing waves. They are driven by a class D amp that is rolled off above 60Hz. Now the bass at the listening position is correct like it is elsewhere in the room.

I do the same I use a passive XO 250-280 hz and up. 280-300hz and down it's an active crossover with full blown correction.

I use 12K class Ds. Bullet proof & a 2496 active crossover. I can't break one.. 3500 watts @ 4 ohm per channel.  They can do 1 ohm but 2 ohm stable for a while.. :-) 500.00 with volume control.

OXO (2496) is about 300.00 or so.. + 100.00 or so for # 10 Cables, speaker and PC

I run 6/12 8" MB drivers in two 42/76" columns. Clear as a bell direct coupled, no crossover between the amp and the drivers. Perfect bass control. Under 1K for everything

You could power 2-12 12" HE drivers very easy.. They run so cool I disconnect 2 of the 3 fans and use a mini toggle switch for the one over the power supply. I've yet to turn it on in 3 years. Barely warm to the touch when I'm blastin'

Regards

Bi-amp, horizontal. Haven't used class D on anything above 100Hz, but you could use your integrated for the mid and highs if it's separable with an electronic crossover. Been bi and tri-amping for 42 years, not going back to passives any time soon.