Drotti - The Audiogon Thiel Owners Forum can be joined easily. I don't remember exactly how. There is a help desk where you can ask.
Anyhow, did you get an answer? The Thiel EQ is a discrete, dedicated equalizer that begins at 200Hz and applies boost steadily increasing to 10dB of boost at 30Hz. Any EQ that will do that will work. Boost the preamp output and feed the boosted signal into the power amp.