Just as the Subject states I need an inline subsonic filter. I'm finally tired of looking at my new 6.0 cubic foot ported box I built for my L7 15" sitting in my room. I want to hook it up to my JBL bp1200.1 but I need a subsonic filter first.

Kicker recommands a 25 Hz set at 24 db octave for it. Anyone know where I can find one? I looked around crutchfield but they only had 12 octave... and I'm an idoit when it comes to ported boxes. I spent a good 40 minutes searching on google and didn't have any luck either.

 

I got the local audio shop trying to hunt me a pair down... I'll let you guys know what I find out. From the looks of it most filters are only for 12 octave not 24....

 

Its a little pricey but try this. http://www.cardomain.com/item/PHOTBASSCUBE
also whats you box tuned to. usually most people set the ssf to 5 htz lower than tuning.
Or try an fmod at 30htz. its only 12 db per octave but the bump up to 30 should compensate
enough
http://www.partsexpress.com/pe/showd...number=266-248

 

http://www.thezeb.com/detail.aspx?ID=6362

like those?

 

Those things stink.
The problem with them is they are passive x-overs and the x-over frequency is subject to the impedance of the load. Just like when you use a “base blocker” (cap) as a high pass x-over for your mids and highs, the value of the cap needed to give you a x-over frequency of 100Hz (or what ever) will vary dependant on the speaker impedance. With an “Fmod” the load impedance is the input impedance of the amp. The input impedance of an amp will vary from manufacture to manufacture and even model to model. So that “Fmod” will have a different x-over frequency depending on what amp it is used with.
There’s no way to know where your x-over frequency will fall when you use an “Fmod”.

 

The box is tuned to 30 hz. Anyways yes I was just looking for an Fmod type inline. I plan on selling the box and sub, cause a 6.0 cube box isn't going to fit into my formula anyways. I just wanted to get a filter so I could play it 30 to 45 minutes to make sure I wasn't selling someone a dud. So I figure I would throw 30 bucks into an Fmod type because it will only be used for testing out ported boxes... and I might not decide to build another one. My car is going to implement sealed subwoofer boxes only, due to the lack of space.

 

The PG Bass CUBE has both a fixed and tracking subsonic filter at 18dB/oct. Or you could get a PG Xenon monoblock amp. They have built in 24dB/oct subsonic filters adj from 5 to 55Hz.

 

If its tuned to 30 htz as long as your not playing test tones below 30 htz you should be fine. Most music doesn't go below 35 unless you listen to pipe organ type music

 

I'll probably just go with an Fmod or just play it for a little bit to make sure it works without one. I don't really see the point in shelling out 200+ bucks if I'm just going to sell the sub and box anyways.