Buttkicker Amp Low Pass Ineffective - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 6 Old 10-15-2018, 05:09 PM - Thread Starter
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Buttkicker Amp Low Pass Ineffective

I purchased a buttkicker lfe today, and the seller threw in a buttkicker amp. The serial number does not match any of the recalled units. The transducer responds to all frequencies despite the high cutoff set to 40Hz. I performed a slow 1Hz to 100Hz sweep. If I turn off the high cutoff the transducer responds even more, so the cutoff is doing something, it's just not 100% effective.

Is this typical behavior of the amp?
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post #2 of 6 Old 10-16-2018, 02:10 AM
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Do you mean a Low Pass filter set to <40hz or a High Pass set to 40hz>? I'd be setting a 40-60hz low pass for your Buttkicker if thats what you're after....
In either case though the slope of the filter may only be shallow at 6db (unless it's adjustable) but the filter isn't a brick wall so you will still get frequencies outside of your 40hz crossover.
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post #3 of 6 Old 10-16-2018, 02:21 AM
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I have mine set to 50. I think it does a good job. I never feel voices or anything like that.
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post #4 of 6 Old 10-16-2018, 02:54 AM - Thread Starter
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I had the low pass (labeled on the amp as "high cutoff") set to 40Hz. The buttkicker responded as high as 100Hz whether the cutoff was turned on or off. I tried googling so I figured I'd ask here in case somebody could verify that their's does the same.

Last edited by lmidgitd; 10-16-2018 at 04:36 AM.
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post #5 of 6 Old 10-16-2018, 03:46 AM
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Quote:
Originally Posted by lmidgitd View Post
I had the low pass (labeled on the amp as "high cutoff") set to 40Hz. The buttkicker responded as high as 100Hz whether the cutoff was turned on or off. I tried googling so I figured I'd ask here in case somebody could verify that there's does the same.
The high pass is a crossover that runs (I think) 6db per octave but it may be 12db per octave. Each octave is doubling in frequency. So if you set it to 40hz and play a tone, at 40hz it will be N DB. At 80hz it will be N-6 DB, at 160hz N-12DB etc.

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post #6 of 6 Old 10-16-2018, 04:37 AM - Thread Starter
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Quote:
Originally Posted by markmon1 View Post
The high pass is a crossover that runs (I think) 6db per octave but it may be 12db per octave. Each octave is doubling in frequency. So if you set it to 40hz and play a tone, at 40hz it will be N DB. At 80hz it will be N-6 DB, at 160hz N-12DB etc.
I guess I should have looked up the octave separations. -6dB at 80Hz sounds about right for what I was feeling between the low pass being enabled or not. Excuse my ignorance and thank you all for your help.
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