Hello Jeff,

As much as we'd love to sell you more than one of these for your subs, it's really not necessary. Here's why:

You're going to position the microphone in your favorite listening position at which point you'll run either the "auto" or "manual" EQ software. The SMS-1 will then begin to address the signal it is recording/hearing in that position. Please note that I didn't say it would address your subs. Instead, it's looking at the bass output from each sub as a whole as if it were coming from one sub.

This of course would be an entirely different situation if you were running "stereo" subs. However, in our experience, that's a relatively uncommon practice. Most people run dual mono subs, and in a dual mono sub configuration a single SMS-1 does a great job, and yes...I've experienced this first hand

Scott