subsonic filter

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Audiobahn1500

Copper - Posts: 91

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

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Francious70

Silver - Posts: 629

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.

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Audiobahn1500

Copper - Posts: 91

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?

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Francious70

Silver - Posts: 629

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.

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OhioMike1101

Silver - Posts: 343

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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subsonic filter

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