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Hey guyz, okay here's my question.

First are they worth it?

Do they work?

What do i need for a set of 5.25" speakers and a set of 5x7" Speakers?

Any more info needed?

Thanks y'all!

if the amplifier or head unit doesn't have a high pass filter then yes you should use them.
they are a high pass passive filter.
for a 5.25" you'd want to set around 125Hz HP, 12-18dB/octave slope

'Ight well both my amp and hu have high and low pass filters, so they are not needed then i take it.

Thanks kiki

-Dave