I used to enjoy watching people who came over to enjoy some tunes, jump out of their skin, when Tony Levin hit that certain note on his bass stick on Al DeMeola's Scenario. At the time I had a pair of AR9lsi driven by a pair of Perreaux PMF 2150's. Priceless!
Speakers with deep/powerful bass
I used to have a system with large speakers. Each speaker had two 12" woofers. When I would play Hard as a Rock from the AC-DC BallBreaker CD there was a moment at 35 seconds into the song when it felt like someone was jumping on the floor behind me. This would only happen if my JPS Labs Golden Flutes were looped into the system, and it was playing very loud. Without the Golden Flutes it didn't happen. It was a truly frightening experience the first time it happened, because I was home alone. Has anyone else had anything like this occur?