Update: I had bought an hpf and was rolling the bass way off on my amp and that was fixing the problem. Then, while troubleshooting my F115, i had a thought. Went to my F210, loosened the grate until the spacers stopped pushing, then a quarter turn tighter, problem solved.
Grill was on too tight. Hope that's not what caused the previous owner to give up on it. Sounds killer now
Grill was on too tight. Hope that's not what caused the previous owner to give up on it. Sounds killer now