I have not heard the Klipsch subwoofers, but for a HT set-up I don't think your friend will be disappointed with the Def-Techs. Their built in subs are great, and the rest of the speaker does not disappoint either. Not the most extended highs however, athough MY experience with the Klipsch I've heard is that they tend to be a bit bright. I have had about 10 Def-Tech speakers (6 with built in subs, former flagship BP3000, BP2006, BP2002)and feel they are a great value.
Hope this helps-
Steve
Hope this helps-
Steve