I have an chance to pick up a first generation HGS-18 for $1200. It's a music-only system with some Klipsch Chorus IIs and a McIntosh MC352. The system is EQ'ed to +/- 2dB using a DBX Driverack. It's dead flat to 31.5hz in room, and I want something to fill in to 20hz that can keep up. Thoughts?