Hi, Need experienced help, I just received and installed my Fi SP4 15 D2, powered by a Crescendo B3500D(the volume on the amp is up to 75% on the gain knob on the amp and bass boost in 0 and on the head unit the subwoofer level is in max), and I feel the bass is weak for what I expected...
1- Is this normal? Or what should I do?
2- Is there a specific way to put the ohm load down to 1 ohm on the sub?
3- What specific grill fits this sub?