Amp subsonic or infrasonic filter necessary?

[LittleJoe 10+ year member]

for a sub? If I am using a 4 channel amp bridged to feed 350-400 watts to a JL 8w7 does does not have a subsonic or infrasonic filter will it damage anything? I just remember back in the day I ran tons of power to multiple amps that did not have those filters. no harm done.

I am not sure if this box will be sealed or ported. I am wanting sealed simply for space.

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[Kangaroux 5,000+ posts]

The only thing the subsonic filter will protect is your subs. It won't hurt the sub too much but if you're pushing it hard on like a chopped and screwed song chances are there is gonna be some low stuff in it that would normally be protected by a subsonic filter.

 

[LittleJoe 10+ year member]

well originally i was going to go sealed but I only have about 350 watts available. That lead me to thinking I should go ported but I don't have the filters on my amp. Therefore I may be back to using a sealed box. I'm just worried that the sub will not give that much output.

 

[akheathen Premium Member]

you don't need to run a subsonic filter, if you tune your box correctly. that goes for both sealed and vented. basically, if you tune the box higher, and/or you will gain some spl, but excursion increases below the roll-off. you can build the box so that it does not happen. if you happen to build the enclosure so that it does have a sub-sonic excursion rise, then you use the filter.