Received a 12 amp Powervar yesterday and tried it with my Marsh A400s plugged into it. Didn't expect much but am leaving it there. Got it for other duties but detail and openness along with a better S/N ratio means it's staying for amp duties. I listen to music loud at times and cranked it for quite awhile last night. I could not detect any signs of compression or any other anomoly, just the cleanest sound I've ever had. Listened particularly to the bass which is where I thought it may show signs of weakness. The speakers I'm using have four 15's and two 10's for bass. The clarity of the upper mids through the treble is quite pronounced. After reading Bryston's and Naim's articles on not using a power conditioner with your power amp I'd not really considered it, especially with all of the user comments regarding compression etc. I'm very pleased they are wrong, at least in this case. I've got a dedicated 20 amp line but live near a commercial area and not far from an industrial area so my power is no doubt pretty dirty. Just didn't expect anything from adding this power conditioner especially since the Marsh has filters for the power coming in not to mention a huge transformer and four large Nichicons in there. The improvement was obvious almost instantly and still is a day later. Have several hours of listening in at this point.
