Until 6 months ago I also had the NHT 3.3s. They don't need a subwoofer, especially one that requires an extra crossover in front of the 3.3s. Definitely go with the digital EQ. However, I would recommend t.c. electronics Finalizer. In addition to a wealth of EQ options (parametric, multi-band, shelving and graphic), the Finalizer has several dynamic processors. It's best known for it multi-band compressors, but it also has expanders. Most popular music is overly compressed and as a result has very little real dynamic range. The judicious use of an expander is an excellent way to overcome this common flaw in modern recorders. t.c. electronics, like Z-Systems, is a pro audio company. There products are available world-wide at pro audio dealers. Also, if it doesn't work out; there's a ready second hand market for this item. It sounds like you're having fun with your system. Good luck.
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?