Dobermann

iTrader: (1)

I just wanted to get some advice on the use of the ss filter with a sealed enclosure.

Im using a w7 in a sealed box, my amp have a ss filter but I never used it because I always used sealed box and never damaged any sub I used...

Is there any point for using a ss filter in a sealed enclosure?

Where should the ss filter set 5hz, 10hz, 20hz...?



Thanks

veeman

iTrader: (3)

I always use it for three things; protection for the subs, reduce the amount of work the amp has to do when reproducing frequencies below what I need, and to clean up ultra low bass irritants. My signal processor allows me to set it very precisely and at up to 30db/octave slope, so I have experimented a lot and I like it set at exactly 20hz at 30db, this gives me the tightest possible bass in my set up with no overhang or sub bass rumble.

Dukk

^ ditto - and right about where mine is set too

M.C. Ryan

The point would be having a more efficient amp because you wouldn't be trying to recreate bass you cannot hear.

theboy

but Dukk your a ported guy......you need a subsonic filter!

crabmustang

iTrader: (3)

Think of the Subsonic Filter as the saftey line when bungie jumping, if the line breaks the saftey line is there to save you, Subsonic filter works same way if you send too low of a signal then it doesnt amplify it and your sub lives.

I would set at 30hz or above for average system but every system varies, if its there use it in my opinion, if your ported I would use for sure.

Its personal preference

Garett

Dobermann

iTrader: (1)

Hey

Thanks all for fast replies

Ok, I understand more why I should use the ss filter.

Now Veeman said : My signal processor allows me to set it very precisely and at up to 30db/octave slope

What is the db/octave thing? Im sorry but all those technicalities are new for me

And I used a test tone CD where I have all tone and i can clearly feel and ear to 10Hz so i guess set the ss filter to something like 20Hz would be great or too is it too low?

veeman

iTrader: (3)

First, you have to understand what an Octave is. It is a doubling of a frequency, or cutting it in half. Typical octave settings on an eq may be; 40hz,80hz,160hz,320hz....etc...Those frequencies are set one octave apart. Now if you have a 30 dB/octave subsonic( infrasonic) filter(cross over) set at 20 hz, then the signal at 10hz(1 octave lower) will be reduced or attenuated by 30dB's. The slope continues at the same rate, so at 5hz(2 octaves lower) the signal would be 60dB's lower than at 20hz. Hope that helps.

Dobermann

iTrader: (1)

Are all (infrasonic cross over) work same way? I mean 30db reduction per octave if I understand clearly

Dobermann

iTrader: (1)

Well I have read the user manual of my amp and found that the infrasonic cross over work with a 18dB per octave slope.

So i guess this answer my question above