lpf at amp or headunit or both?

[cocoleveo7686 10+ year member]

If I set my lpf on headunit (kenwood ddx773bh) to 80hz, should I have the lpf on the amp set to 80 or have it WIDE OPEN?

or should I have it set on THROUGH on the headunit and try to set it as close to 80hz at the amp as possible.

or do I set both to 80hz at close as possible?

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[BOOMINGRANDPA 5,000+ posts]

I just use 1 on the they say using both could isn't needed and don't help

 

[LosIsATool 5,000+ posts]

Never use both.

 

[cocoleveo7686 10+ year member]

Never use both.

ok so does that mean If im going to use the one at the headunit I set the lpf on the amp all the way up?

80 or 100hz for sub?

 

[LosIsATool 5,000+ posts]

ok so does that mean If im going to use the one at the headunit I set the lpf on the amp all the way up?
80 or 100hz for sub?

Whichever you don't use either turn off or full if you can. If not open it all the way up.

 

[SubbinNCali 10+ year member]

I've always used the HU filter and wide open on the amp simply because I know exactly where its at. Most work just fine. No need for both.