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SubSonic

 

Purple People Eater
Unregistered guest
I'm a newb and i know this is a newb question, but i just got 2 alpine type R's and a DEI 1100d amplifier. and on the amp it has something called a subsonic filter, i was just wondering what it does and whethere i should have it on or not?
 

Anonymous
 
lol, i prefer my people blue. tastes sweeter than purple.
 

Silver Member
Username: N2audio

Lawrence, Ks USA

Post Number: 130
Registered: Mar-04
primarily it's for use with a ported enclosure. One of the functions of the port is to control the travel of the woofer cone, but at 1/2 octave below the tuning of the enclosure that control is gone and the woofer can be damaged. With a ported enclosure you should set the SSF at or near the tuning freq of the enclosure.

With a sealed enclosure the cone travel is controlled by the fixed volume of air inside the box, the SSF can still be used to block the ultra-low inaudbile freq's (<~20hz), but there is nothing to worry about as far as damage to the speaker.
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