subsonic filter, need or no?

[awolsniper]

Ok, I am building my next trunk system as I speak.

Three Alpine Type R, 12"

Sealed enclosure for each one.

JBL 1200.1 amp.


The amp does not have a subsonic filter built-in. I am wondering if one will be needed in this application? Since it's sealed I was thinking yes...where can I buy just a subsonic filter/some sort of high-pass filter? If I need one, it seriously has to be as cheap as possible lol. Thanks.

[rana]

what deck are you going to be using?....and also...i looked up your amp and it does have low-pass crossover.....isnt that the same as a subsonic filter?....

basically you dont want any frequencies above a certain range to be playing from the subs right?...

[awolsniper]

Hey rana,

Alpine CDA-7893. It does not have a built-in subsonic filter.

The amp has a low pass filter, not the same as subsonic. Actually, the term subsonic is inaccurate but we won't get picky :P

A high pass crossover is more like a subsonic filter than anything, it only allows frequencies about that which is set to be reproduced. In this case, the high pass would be set to about 20hz.

[dshr]

awolsniper what up it's e26pmpn from 190Rev. Neways you will not need a subsonic filter unless you are going to play test tones. Most songs do not play low frequencies that would damage your subs. I believe you will A ok :D

Their are a few companies that sell high pass filters. I can't think of them right now im a bit intoxicated :eek:


-Dustin

[pnsji]

You should turn the subsonic filter on because it might hurt your subwoofer.
Human ear can not hear Subsonic frequency anyway. If you play a low frequency (from test cd), like 15 hz, you can see the subwoofer is moving, but there is no sound coming out. This is ussually to test the xmax of the sub(how far the sub will travel peak-to-peak.

[rana]

Originally posted by awolsniper
Hey rana,

Alpine CDA-7893. It does not have a built-in subsonic filter.

The amp has a low pass filter, not the same as subsonic. Actually, the term subsonic is inaccurate but we won't get picky :P

A high pass crossover is more like a subsonic filter than anything, it only allows frequencies about that which is set to be reproduced. In this case, the high pass would be set to about 20hz.

thanks for clearing it up.....i didnt know they were two different things ;)

[Mother Russia]

it is not neccesary to have subsonic if you have sealed boxes, and it is highly recommended to have one if your enclosures are ported

[craiggotgame]

You can check crutchfield. I think I remember them selling little crossovers that piggyback on your rca's, they may have somthin you could use.