I am using a pair of the SB3s in a small listening room and I don't find them overly bright at all. I have soom experience with NHT 2.5s and felt they were exceptionally bright. I also owned a pair of the Super Ones for a while and found them lacking. I purchased the SB3s kind of accidentally and am satisfied because I prefer a warm speaker. Haven't heard the ST4s but would expect them to sound similar to SB3s with additional bass extension. I use a pair of Paradigm Studio 60s in the living room so I like full bass sound -- the SB3s fit the bill.
