I have the KLF-10's like them alot. Purchased SF-3's The SF-3's sound better than the KLF-10's side by side. Using same power amp, Same room, same positions. The sf-3 has an overall smoother sound. The eight inch woofers really suprised me ecspecially with cabinet size as a factor. Actually have more punch than the 10 inchers in klf'S. Defies logic. I believe klipsch took the RF-3 and made the SF-3 out of it using woofer materials as used in klf series with aluminum tweeters. The specs ,size, wieght, everything identical. Just no pretty gold color.