actually, check their site, the accoustic loss is higher on the damplifier than the STFU-80. Also, mass is not the key to sound deadening, the ability to transfer vibration energy to heat energy and disperse it is. If you get a deal on this that's great, don't claim that "pound for pound" so to speak it is better if you can't support it. I also get dynamat wholesale and you can't beat that!