So, I bought an Amp Blanket about a month or two ago and I installed it over my amp. I noticed some changes in my tone almost immediately. On the plus side, I was able to get the amp into overdrive at lower volume levels. I did however notice a significant loss of highs and mids. The amp had kind of a "muffled" sound. I also started to worry about the tubes overheating due to lack of ventilation. So I decided to make a change tonight and I removed the Amp Blanket. OMG! I swear, it was like I had taken a blanket off of my amp.