I'm one of those guys that pull the drivers and rolls the inside with soundcoat and then peel and stick rubber, (very porous), to boot.
Concrete does work well but it's best to use a very course fiberglass batting also..I used a 20 CF underground vault.. Bell shaped...A block of bass. 1500 lb at least..Depends on the drivers..too.
Weight is good...I have a pair at 395 each. Weight is good...They don't rock. I've never added weight. they always were heavy...250 and up..
Bass bins, who knows.. HEAVY....little ones are 200 lb or so..
Regards
Concrete does work well but it's best to use a very course fiberglass batting also..I used a 20 CF underground vault.. Bell shaped...A block of bass. 1500 lb at least..Depends on the drivers..too.
Weight is good...I have a pair at 395 each. Weight is good...They don't rock. I've never added weight. they always were heavy...250 and up..
Bass bins, who knows.. HEAVY....little ones are 200 lb or so..
Regards