setting LPF in hu?

[microhaxo 10+ year member]

Hi,

I just noticed that after about 2 years of owning my sony deck that it has a LPF option in the deck.

My question is:

Since i already have my lpf set on my amp for my sub to 100 should i turn on the LPF on the HU, i have two options on the HU, 78 and 125hz..

Should i just leave it off like it has been and just use the 100 set on the amp or turn it on?

Will it only affect my subwoofer or will it apply that to my speakers as well?

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