These replaced Polk RTiA9 towers I had for 9 years. I was also using their CSIA6 center which I replaced with the Polk Legend L400 center. I had a 7.2.2 setup using Marantz SR8012 driving A9s bi-amp. I debated buying the older Polk (half price) LSIM 707s but opted for these because of the newer technology and hunch that I would always wonder "what if." This purchase spawned even more "what if" purchases. These speakers are 4ohm and according to polk just as power hungry as the A9. I couldn't use the Marantz mixed with my other 8ohm surrounds so I bought dedicated external amps for the L800s (270w each ch) and another for L400 (bi amp 220w each ch) using pre outs on the Marantz. I've been breaking them in for two weeks now and they sound better than wonderful. Music via amazon hd (using HEOS) lights up my entire house. I also added a down firing front height dolby atmos to make a 7.2.4 system using Auro-3D for a wall of music. Joy has returned to listening again. Classical and pop pour through the house. The promised SDA spatial presence is real and looms whether in Auro-3D or regular stereo. I have to tell you how utterly pleased I am with the matching L400 especially in Auro-3D. The tweeters in the L800s and the L400 are incredible and worth the expense at twice the costs. I talked to a SVS tech who waxed about how revered the original SDAs were and how they are still traded reverently on eBay. Of course crutchfield experts were essential and competent as usual.
Pros: Everything especially the tweeters and real SDA. White glove delivery was much appreciated.
Cons: The SDA cable is thick with huge 1.5 inch ends. Was a bear to fish through my walls.
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