Need help with two subs and external crossover....


Ok, I own two Final Sound subs that I run off my preamp. I no longer want to use the crossover built into the plate amps as they don't allow me to crossover low enough - below 40htz.

I will need to purchase an external crossover for my subs only which I can set to 30 htz and below. I don't want to spend more than $300 or so and would like to hear suggestions.
Convert?fit=crop&h=128&policy=eyjlehbpcnkioje0otyxmtczodksimnhbgwiolsicmvhzcisimnvbnzlcnqixx0%3d&rotate=exif&signature=601a815d285dcfd7625ebec1e4566ffd89c87b262942031365900e662ecb3d68&w=128grannyring