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