It only took 5 minutes to do the window test. It didn’t work very well, no noticeable improvement, a waste of good fo.Q tape at least in my listening room. After the test, I took the strips off the window and stuck them to the underside of my PrimaLuna amps where I have not used any fo.Q before. A huge improvement immediately on the amps. (I hope the glue doesn’t melt, but even if it does it won’t do any harm under the PrimaLunas).
edit - under the PrimaLunas is really a knock-out!
edit - under the PrimaLunas is really a knock-out!