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subsonic filter


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Audiobahn1500 
Copper - Posts: 91
Copper spacespace
Joined: March 31, 2004
Location: United States
Posted: June 22, 2005 at 2:32 PM / IP Logged  

Hey all i got a quick question for you.  Is it tottally necessary to have a subsonic filter when doing a ported box and what is the purpose of one.  Also what can happen if you dont have one? will it damage the speaker? Thanks guys!!

Chad

Francious70 
Silver - Posts: 629
Silver spacespace
Joined: July 26, 2004
Location: United States
Posted: June 22, 2005 at 3:31 PM / IP Logged  
Yes, very important.
What happens is below the tuning frequency is the sub moves into over-excursion with very little power.
Audiobahn1500 
Copper - Posts: 91
Copper spacespace
Joined: March 31, 2004
Location: United States
Posted: June 22, 2005 at 4:33 PM / IP Logged  
so then the subsonic filter stops this from happening i take it? how does it stop if though.  I'm going to be building a box that is tuned to 35hz so what should i set the filter at then on the amp?
Francious70 
Silver - Posts: 629
Silver spacespace
Joined: July 26, 2004
Location: United States
Posted: June 23, 2005 at 10:31 AM / IP Logged  
The sub-sonic filter is a high-pass crossover that operates at low frequencies.
OhioMike1101 
Silver - Posts: 343
Silver spacespace
Joined: August 22, 2004
Location: United States
Posted: June 24, 2005 at 5:49 PM / IP Logged  

If you are tuning 35hz and below it is not really  neccessary for a subsonic filter.  The sub will play the lows just fine.  Below tuning, it is about motor strength.

PPL have been running ported subs forever without subsonics.  They just came about in the last 5 years or so.  They are not neccesary, but if you have it....  use it.


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