High pass filter on a subwoofer? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 5 Old 11-04-2019, 03:15 PM - Thread Starter
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Question High pass filter on a subwoofer?

Maybe this is a silly question but... when hearing music, i feel like adding a HPF(30Hz) on my sub improves quality and eliminates a little of port noise

So... How usefull can be or what you think? Maybe a secondary effect could ocurrs from this? (Taking in mind when the speaker strugle to get low)

What i'm thinking is that leaving a more narrow fq response on the sub it's realease it from a lot of power needed especially on the low end

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post #2 of 5 Old 11-04-2019, 04:31 PM
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Many prefab subwoofers have undersized ports that lead to port noise issues. Using a hpf to combat that is a decent approach. If it sounds better that way, run with it.
The ported sub should already have a built in HPF, so the cascading filters can result in a very steep slope.
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post #3 of 5 Old 11-04-2019, 05:19 PM
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Even a no compromise ported sub should have a HPF, at least 2nd order, just below tune. This is to prevent cone over-excursion due to high level signals below tune.

“You are not special. You are not a beautiful and unique snowflake.” Chuck Palahniuk
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post #4 of 5 Old 11-04-2019, 08:01 PM
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1: excess unproductive cone excursions do not help sound quality
2: port noise doesn't help sound quality
3: an HPF can help both of the above.
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post #5 of 5 Old 11-07-2019, 03:07 PM - Thread Starter
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Thanks, for some reason this is something that i usually never see, i'll experiment a little more with this, now i dont feel akward going agains the meaning of the sub

I guess that i'll need to re run my measurements and filters again
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