ISOTEK - Full System Enhancer CD

I also have XLO burn in disk which did not impress me.

But Isotek did wonder to my system in cleaning the sound and reducing hiss noise.

The XLO Test CD works very well but you have to follow instructions and run it continuously for two - count em! - weeks. Then you will be impressed. Rome wasn’t built in a day. 😬 What hiss noise? Tape hiss noise? Did you use the Isotek disc to position your speakers?

I also have Isotek positioning disk which did not impress me.

I used to have slight hiss noise out of tweeter and I had tried to reduce it with grounding block.

But after trying Isotek CD enhancer, such hiss had been almost gone.

Viola this disk saved me lot of money.

Grounding blocks are also pretty expensive.

Maybe there was a snake in your tweeter. 🐍 It’s highly doubtful that hiss can be affected by either grounding or burn in. Just my 2 centavos.