Room Correction Hardware options ?

Audsyssey Sound Equalizer
Rives PARC

I use the Copland DRC-205 with awesome results. I use it with elecrtostat speakers as well.

Good Luck

TAC. No contest. Read Cordesman's reviews of his TAC, which is still in his system.

No doubt about it: The TacT 2.2XP! The Rives is an excellent PASSIVE unit, that will bring down peaks, but can do nothing about nulls. The TacT allows one to place the actives woofer of one's bi-amped system in the corners of the room where they can effectively load the room evenly and aligns them with the main speakers in the time domain. It also provides the option of a parametric EQ, if you want to curve the room via a steady-state(pink noise) signal in addition to the unit's automatic Fast Fourier Transform fuction(among a number of other features). If you are not thinking of actively bi-amping your system, the Tact RCS 2.0 preamp is what you'll want to investigate.

Since you didn't mention a desire to bi-amp, here's a page that offers info on the TacT RCS 2.0(download the free review): (http://www.avguide.com/products/product-477/) If you have no nulls that you'd like to bring up to level(highly unlikely): I would recommend the Rives unit as no other EQ will be as transparent in your system as a passive.