I agree with the above posts. I had a P300 in my system for a couple of days and do miss that peice of gear. Being able to tweak the frequency yeilded even better gains than just pluggin it in, even with just plugging it in though it sounded great. I noticed a good degree of taughtness in the low end after adding it as well as smoother less grainy highs. Like Photon46 noted the fan was a bit noisy and would be replacd if i did own one. I will definetly be purchasing a PS regenerator one of these days.