please help wit sub problem

[kev831]

My subs have been acting up lately they'll hit hard when i turn my car on and then they'll start to play noticeably softer 30 seconds later ....i never over lowered them either the subs r 300 rms each and have them hooked up to a 600 rms amp and the vol on the hu goes up to 50 and i only keep it at 30 the it will hit super hard..please help!!!


2 12"jl w1v2
Ssl ev1500m
Jvc hu

[pbnj22]

are you getting consistent volts?

[audiobaun]

Id go get your battery checked out, unless you know how to check for yourself..Its FREE at orileys/Autozone, and most Auto parts stores.Your battery,or your alternator could be the culprit.Also remember that Recordings on certain songs may not be very good on a USB/Micro SD card, or off the Ipod/,ect.All recordings are different/cd made ect,could be the issue as well.Get your battery/voltage checked out first,and let us hear how it comes out?