Subsonic Filter

[CaviHitts 10+ year member]

I just bought a Directed Audio 1500D. It has a subsonic filter that cuts off at 30Hz. What does this actually do and what benefits does it has.

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[kickerlivinloud 10+ year member]

I ssf is a must have for a ported enclosure. I don't know how versed you are in car audio so I will start from the begining. When you have a ported enclosure that enclosure will be tuned to a certin freq. This is shown by ex: 32Hz. What a ssf does is that when your subs goes to play a note that is tuned lower then your box it will stop it from playing that. If you didn't have a ssf then your sub would have TONS of stress put on it and if not fixed will eventualy lead to the subs burning up. SSF's are a most have for an ported enclosure. The exception to that is that if your enclosure is tuned low enough you will not need a ssf.

Hope this helps out a little bit...

Jon

 

[kickerlivinloud 10+ year member]

Sorry my bad...

Thanks Jmac for the correction...

Jon

 

[CaviHitts 10+ year member]

I actually have it in a my subs in a crown design sealed box for 3 12"s. So would the subsonic filter be of any use since they aren't ported?

 

[kickerlivinloud 10+ year member]

With the box being sealed don't worry about the ssf...

Jon

 

[boomcar 10+ year member]

and for me can you help me,i use 2 sx 18" in a box of 15cuft,with a port of 174squinch tuned to 34hz my subsonic filter is between 20hz and 50hz

what is the best position for my installation?

thanks

 

[rick22 10+ year member]

hows about a 3.3 cuft box tuned to 32hz