LPF on deck or amp "?"

[KenC210]

So i just curious if my deck sets the sub LPF and i set it at 80hz would it really matter where the LPF on the amp is just as long as its not under 80hz or should i still try and get it close to that point? I know i still need to set the subsonic i just curious more about LPF.

[Guest]

So i just curious if my deck sets the sub LPF and i set it at 80hz would it really matter where the LPF on the amp is just as long as its not under 80hz or should i still try and get it close to that point? I know i still need to set the subsonic i just curious more about LPF.

correct

[KenC210]

So i just curious if my deck sets the sub LPF and i set it at 80hz would it really matter where the LPF on the amp is just as long as its not under 80hz or should i still try and get it close to that point? I know i still need to set the subsonic i just curious more about LPF.

correct

Thank you for clearing that up i thought thats how it worked just wasn't to sure

[Jessica]

I'm glad you asked this because it brings up another question too. I'm not trying to thread jack. This question relates to your question.

I wonder if say both the amp and h/u had 18db/octave slopes would that be in effect an 36db/octave slope or do you lose some attenuation when a signal is already attenuated.