Summary: What can I say but WOW!. Connected to an Onkyo TX-SR603X. Despite the poor acoustics of my living room, single sloped vaulted ceiling with open layout, the sound is crisp with clear highs and rich lows. Passive radiator technology has been around for a long time but these are the only speakers I found that employ this technique in the satellites. Love the side volume control on the sub-woofer.