Subsonic Filter setting for custom 15" nightshades.

[bobonit 5]

It looks like I'll finally be getting these bad boys in the car soon. Box is built, kicks are built, just need to mount the 8's in the doors and dress everything up. Soon I'll be installing the actual components and setting everything up. I've never done a ported enclosure before so I'd like to get some advise on the subsonic filter from you guys.

This install is with the 2 copper coil 15" nightshades which have a Fs of:

Fs: 30.9 Hz settling to around 28 Hz after break in.

I have the box tuned to approx 29.5 to 30hz. What should I set my subsonic filter at so I don't unload these things? They will be powered by one SAZ-3000D at 1ohm.

Thanks again for all your help. This build is coming out better with all the help I get on here.

Bob.

[3stagevtec 2]

the lowest i would go is 3 - 5Hz below tuning..

[KU40 173]

probably around 25 hz.

[bobonit 5]

Ok, thanks. I'll try 25.