My HU has three settings for what seems to be the sub crossover. Here is what the manual says.
WOOFER Subwoofer cutoff frequency
LOW: Frequencies lower than 55 Hz are send to the subwoofer.
MID: [Initial]; Frequencies lower than 85 Hz are send to the subwoofer.
HIGH: Frequencies lower than 115 Hz are send to the subwoofer.
I have it on MID now. Should I put it on high, or is 85 high enough for the subs? If I have this set then what should I set the amp to, or do I even need it's crossover?