I recently purchased a pair of 150's for my main stereo system. I was wondering if anyone has used these, or any good bookshelf speaker with the Logitech Z-5500 amplifiers. I use the DVD audio player that comes with the Creative xfi extreme music sound card and am building a nice collection of 6 channel audio dvd's. They sound, for the most part splendid (mainly quadraphonic classical recordings from the 70's that were recorded with 4 channel discreet analog masters and remixed to 5.1) The logitech speakers sound great but I'm sure the Infinity's will sound much better (just the front left and right channels) but I'm worried that they will be a bit much for the amplifiers in the 5500. Think I'm being too cautious? The 150's are 8 ohm's and pretty effecient though. Any thoughts?