Which low pass filter?

[ws140 10+ year member]

Which low pass filter should I use for my subs? The one on my amp or the one on my h/u. Or can I use both at the same time? I am thinking just use the h/u lpf becuase that one is probably better. Equitment in sig.

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[jbl_marshall21 10+ year member]

use the one one ur amp. that a way u don't just have the lows going to ur component speakers. if u just want the lows in ur subs then u use the lpf on the amp.