Power Conditioners to reduce Sibilance

I think that you will find some excellent choices in the Balanced Power Technologies line. I am also very pleased with EquiTech though they don't have as many offerings at as many price points. Both are true balanced power units. Based on the research I did at the time, I wouldn't get anything else. Both are available used on the 'Gon. BTW if this is part of an HT room you won't believe what one of these will do for your CRT/plasma/LCD display.

There is little doubt that conditioning your power will improve your sound by reducing the noise floor. And as also has been suggested by filtering the line noise from the digital unit(s). As Bob suggests, improving power cords also helps, get one (or more) that is specifically designed for digital front end sources - again there a lot of them for sale here.

Depending on your setup, ie if you are feeding from a transport to a DAC, you might also consider trying a different SPDIF cable to see if some of the unpleasantness you are hearing is some kind of smearing or jitter

Adamg, Before you invest in wire and power conditioners etc make sure you have exhaused your explorations regarding system set up and room treatments. Toe in is a huge issue for sibilence (or brightness in general). Many speakers are 'hot' when you are listening on or close to axis and need to be pointed straight ahead, or pointed so they cross over in front of the sweet spot (substantially some times). You might check with the manufacturer to see what their set up advise is, or identify your speakers and hope some one here is familar with them an can advise you.

You also need to be sure that 1st reflections points are delt with, that is floor, side walls, and if possible the ceiling. Just put some temporary stuff up and see if you solve your problem. If it works then you can seek a permanent solution. If not, then on to the next thing.

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