A full range speaker in a slimline body! I have never experienced such tight bass from any speaker. Highs and mids are equally impressive with lateral imaging that competes with the best and depth that is impressive and believable. I am driving these with 150 watt NAD C375bee integrated, but they also sounded fantastic with my NAD C320bee 50 watt integrated. Sensitivity is reasonably high, but they are clearly a 4 ohm load and the more amperage the better the sound. They are elegant to look at and passed WAF factor with flying colors. As mentioned in the Absolute Sound review by Neil Gader, if you are considering any speaker up to $10,000, consider the Synchrony Two as a must audition. Highly recommended!