High current amp search

I feel that this is close to the mark:  Legacy i-V2 Ultra

https://legacyaudio.com/products/view/iv2

The manual states:  

The elegant amplifier operates at nearly 80% efficiency at rated output and delivers more than 600 watts into 8 ohms all channels driven while remaining stable into  impedances as low as 2.7 ohms.

Is 2.7 close enough?

As to current (given voltage and watts):

Maximum sustained power consumption:

   2100 Watts @ 120VAC into 20 amp

   4200 Watts @ 120VAC into 40 amp circuit

Price is a little over $4K but less than $5K.

Dear @gavman  :  That does not happens in my system due that the speaker woofers are not field coil design,my subs are integrated through a HP crossover filter and third the speaker woofersand my Velodyne buildmaterial are the same kind.

In the other side my room is different from yours, the standing waves occur at different places and the subs positions are different too. For example:my pair of sub's are firing not to rhe seat position but side to side each sub in front of the other sub. A unique sub's position.

So each one of us ahve towork according each one of us room/system chain.

R.

@gavman  : The other issue is that your room are seen 2 pairs of different signature sound reproduction woofers almost at the same time and from different position inside same frequency range, does not exist a seamless blend like in my room/system.

R-

@gavman  : Maybe if you can match the SPL of those 2 subwoofer pair the issue will be not so evident, just maybe.

R.

@rauliruegas raul the only issue i have now is I'm experiencing better bass and dynamics than i thought humanly possible. 

I enjoy debating with you- if you're ever in my region

consider yourself invited to come,

drink my gin, dig my herb and have your mind blown☺