Most are not really improvements. There are a number of tweeks out there and the problem is that sure you can hear a differance but is truly an IMPROVEMENT. I have been selling and designing audio systems for over 30 years and Ive heard them all. A truly good tweek is one that consistantly makes an improvement in every system you put it in. Ahh power conditioners, lol I have yet to hear one that improves the sound. I dont recommend them. I do recommend dedicated lined, just make sure you do it correctly. Power cords also do make a consistantly big improvement. To me speaker placement is the single most important tweek or setup anyone can make. It takes time and patience but is well worth the effort. Select the right gear and take your time on the setup. DO that first before trying any tweeks to your system. Good luck and happy listening Kevin
