Power Conditioners to reduce Sibilance


I moved my system into a new home and was having problems with treble brightness and sibilance. I moved the speakers around and got rid of most of my troubles. I then upgraded to a more revealing preamp with money that I saved up and the problem returned (despite sonic improvements in other areas). I have read that power conditioners are great for reducing sibilance. Is this actually the case. What would you suggest for under $500US used?
adamg
Let the B&W bashing begin.
I don't agree with the problem being casued by B&W speakers.
These speakers are revealing, that's all. That could be a disadvantage, but you really do want your speakers to be revealing, don't you. The whole idea is to match other components properly. Digital components cause extreme sibilance, not the speakers. Besides, B&W speakers like to be bi-wired, preferrably with a shotgun run of speaker cable of decent gauge in order to have as less impedance as possible. Matching cables both ICs and Speaker wire is a challenge. I would first look at wires that integrate well with your components and this way you will avoid all the brightness. And also your room....Just my opinion.
Like I said it's your room - you know it and I know it. You can get conditioners, DACs, etc and you will have a great system - but flutter echo and brightness will continue to destroy the sound.

I just don't want you to throw all your money away and find yourself in the same spot.
Thanks again for all your responses. I toed-in the speakers such that they cross before the sweet spot and much of the brightness and sibilance have been reduced but not eliminated. I have plans to add some canvas prints behind the speakers in order to reduce the wall reflections. A RGPC power conditioner is something that I will look into purchasing in the future but clearly the room and the speaker placement was the large source of my problems. As far as changing cables and ICs, I use mostly XLO ultra and signature which are expensive for those who are still recieving education and I would prefer not to experiment with new cables. This is my 3rd pair of B&W speakers as a result of my dealers trade-up program and I definitely enjoy their sound. Nevertheless, the metal dome tweeters can interfere with the sound of the music by being overly bright and forward and require a great deal of attention in order to tame them. Once again, I appreciate all of the feedback as this was the first thread I have attempted on this site. Given the useful information I have recieved I will continue to use this as a resource in the future.

AdamG
While I cannot argue with any of the suggestions above, I believe there is no "universal" right answer as to what is causing the sibilence in YOUR system.

I have been chasing a sibilence problem in my system, taking the suggestion that room treatment should be the primary target. I chased my tail with treating first reflections, rear wall reflections, covering all windows, etc.

Then it dawned on me to conduct a simple troubleshooting test.....I used headphones hooked to the tape out of my ARC SP8 preamp. I figured that would take the room acoustics out of the equation. Put on a troublesome LP, and the sibilence was still there. So my problem in my system is somewhere between the turntable, cartridge, I/Cs, and preamp. It is not the room.

So, I'm now changing out I/Cs between the TT and preamp to see if I can solve this.

The moral of the story....I dunno....keep trying! ;-)