I own a z-systems and have the Sigtech digital correction processor. I wouldn't live without the Sigtech for large scale classical and for very smooth low bas. My speakers are Dunlavy SC V. With the Sigtech I got rid of the uneven low bass in my room and have effectively flat bass to 20HZ. The z-systems is a good unit for fiddling with the recordings balance and as a digital contol unit.I'm not familiar with the t. c. electronics units.
Subwoofer(s) or Digital EQ?
When I listen to well recorded CD's my stereo sytems sounds pretty good. However, most recordings I have were not done to audiophile standards. Many recordings are seriously lacking, especially in the bottom end. My system is all Classe components; CDP-1 CD player into CP-47.5 preamp into (2) CA-150 amps bi-amped into NHT 3.3 speakers (all cables are MIT). I could get a DAC-1 and add a Z-systems RDP-1 and/or an 18" quality subwoofer system (probably Bag End or Velodyne). Any suggestions?