Originally Posted by jpcamaro70
I use a denon 791 with audyssey multieq
Unfortunately, to get the best out of your new subwoofers, you would be best served obtaining a miniDSP
that will allow you to use REW to integrate the subwoofers into your room's acoustics.
The MultEQ is the least effective of the Audyssey possibilities but with the addition of a miniDSP (the least expensive alternative), you'll be able to get the most out of your subwoofer system.
The problem with subwoofers and room acoustics, when subwoofer sound waves go unseen, bouncing around the room, they run over each other and where ever they run over each other, they will cancel each other out to the tune of (easily) ten to thirty dB. That's a huge loss of subwoofer based performance. The addition of a miniDSP will help correct for these nulls, by bringing peaks down to help smooth and create a flatter graph. The downside of the miniDSP is that it takes some interaction on the part of the user but the upside, it's designed to work with REW to get the best out of what REW measures. The automatic alternative is a Anti-Mode, 8033S II that will do everything automatically but the downside, it's four times as expensive as the miniDSP.
As a form of encouragement, just saying, picking up a miniDSP will help you get the best out of your new subs and once everything is up and running, and all the pain and suffering of the added expenses and the learning curve are behind you, you'll be glad you put yourself though the process because the reward will be top flight performance out of your new subwoofers.