HPF LPF for Sub Setup

[RebelExtrm02 10+ year member]

I just installed a 350w RMS 2ohm JBL 12" Sub in a sealed 1 cu.ft. enclosure powered by a 360w RMS 2ohm JBL monoblock amp. The other four speakers are ran off the headunit for now. I need advice on the hpf and lpf settings on the amp and headunit.

Current settings are:

On the Amp LPF 80, HPF 30

On the Headunit LPF off, HPF 100

I'm guessing the HPF of the headunit should be closer to the LPF on the amp so i'm not missing frequencies, but I really have no idea. I only set the HPF at 100 on the Headunit because at 80 theres some ratting in the door panel that I haven't had time to fix yet.

Anyone have any advice on better settings?

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[eharri3 10+ year member]

Keep head unit HPF at 90-100HZ with steep slope.. Set amp LPF at same spot with similar slope. Do not use the amp's HPF.

 

[RebelExtrm02 10+ year member]

Keep head unit HPF at 90-100HZ with steep slope.. Set amp LPF at same spot with similar slope. Do not use the amp's HPF.

It was my understanding that on an amp without a subsonic filter that the HPF on the amp acted like the subsonic filter to eliminate the sub from playing frequencies too low that could damage the sub. Is this not true?

 

[RebelExtrm02 10+ year member]

It was my understanding that on an amp without a subsonic filter that the HPF on the amp acted like the subsonic filter to eliminate the sub from playing frequencies too low that could damage the sub. Is this not true?

Anyone?