Air Conditioning Silencer from Wacko Products???

I did ours and measured a 3-4 db improvement. I spoke to to CS guy and he helped me with a few tips. They claim 3-6 db improvement. Not sure where OP got the 8-10 db number but when I bought ours and looked at their site it claimed 3-6 db improvement. I suspect if you have a dump opening you will get the high end, if not, the lower end. Bottom line, much quieter and no longer have to turn up the TV. I recommend it.