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Since when is a "dsp processor" needed for subs? Are you referring to something like the Bit One, MS-8, clean sweep, or a 3sixty? Almost every bass amp out there comes with a subsonic and low-pass filter. Those can be use to tune a system for the majority of people.
Yup that's what I'm referring to. I'm at the moment using a audio control lc7i without it the sub at a certain volume distorts. Trust me I've put already 3 systems in my gs already soon to be the 4th