I am using an Elac S10EQ with my Maggie 1.7's. The setup was very easy and fully automatic if you have a smartphone. The app uses the mic on your phone and EQ's the sub for your room. I now have that extra bass that I was missing. At $499 this was also a very inexpensive upgrade that I ordered from Amazon with free shipping and 2 day delivery, and a 30 day return policy. 400 watts of power and all you need is a line out from your pre or integrated. Here is a clip from Andrew Jones on the Elac site:
Automatic Subwoofer EQ System
Goodbye traditional analog controls. The Debut S10EQ subwoofer incorporate an advanced digital control system. Simply download the ELAC SubEQ app for your IOS or Android smartphone and you will have complete control. No more fumbling around the back of the subwoofer. Utilizing the ELAC Sub Control app and your smartphone's microphone, the S10EQ subwoofer will automatically equalize to your room's characteristics using a 12-band parametric equalizer. Full manual EQ is available as well.
Automatic Subwoofer EQ System
Goodbye traditional analog controls. The Debut S10EQ subwoofer incorporate an advanced digital control system. Simply download the ELAC SubEQ app for your IOS or Android smartphone and you will have complete control. No more fumbling around the back of the subwoofer. Utilizing the ELAC Sub Control app and your smartphone's microphone, the S10EQ subwoofer will automatically equalize to your room's characteristics using a 12-band parametric equalizer. Full manual EQ is available as well.