I second millercarbon's opinion on HFTs. I have installed 32 of them, 3 types. Five levels plus 5 per speaker (tweeter HFTs are a fail on my speakers). The most important HFT is the side speaker ones with 1/8" change radically changes the frequency response up or down. Instead of front and rear wall exterior treatments, HFTs are it!. I have massive built in wall bass filtering/conditioning/traps and thick studio quality side wall and suspended ceiling acoustic panels. I also think SRs fuses and power outlets are great buys. However, I heard the ART system in a showroom and had them removed as well. The difference was subtle better with them in but not worth my money. The bass unit was a failure in my friend and my system, ruined the highs (none over 8Khz) and weirded up the sound (ah, but with a "darker" background). SR is a great company for what they accomplished for my system.
Anybody want a laugh?