Sonance Sonamp Cinema 2120. I was browsing around today and ran across it. The specs are supposed to be freq response 20-1khz, 390 wattsx2 @3 ohms, THX certified. Obviously it's for a non-powered sub or maybe to biamp the lower freqs? I wonder how it would work with my 3.1tl's. With the SDA technology I don't know if the bottom inputs on my speakers could use it. Any ideas. On a side note, I received the SDS-400's from Ebay and finished making an interconnect. I will be firing them up for the first time hopefully later tonight and will post my impressions.