It's not a direct match, but I just bought a pair of the TST3 towers and am VERY pleased at the clarity that they offer in the treble and midrange. I see them as a very good value (and the bookshelves use the same tweeter). If you get them, please give them at LEAST 20 hours to break-in. I used to think that speaker break-in was snake oil and BS, but I am at the 15 hour mark and they have improved noticeably (more air and the midrange is SUPER smooth, and the bass is getting fuller/deeper every hour). They sounded good to start with, but time is needed to have them sound their best. If the bookshelves sound like the towers, I feel strongly that you will be pleased with their performance, especially for the 40% off right now.