I normally can't tell the difference between things. Mp3 & cd quality for instance. But having these installed in my fiesta (no deadening) & installed in my golf, I've noticed the midbass is more prominent, & they are clearer at higher volumes.
From outside I can feel the door vibrate but can't hear any rattles. I'm running 150wrms a side ATM & they're doing well. Will see what happens when I've got my subs in off 1.5kwrms.
The reason I opted for the 2.5mm is the 4mm is 8kg per sheet. 4 sheets = 32kg.