Acoustic low pass

kctess5 · 8th February 2012, 04:29 AM

I got the Lepai amp with subwoofer output that supposedly has a adjustable low pass but the thing is a joke, its like a feeble failed attempt at a low pass. I can clearly hear midrange coming out of the little 6.5" "sub." Other than that the amp is pretty functional, and cheap which is nice.

I can see the obvious answer of just putting a low order passive lowpass on it for pretty cheap but I was wondering if I could get a similar effect by using a 6th order bandpass box with some generous stuffing to cut out upper frequencies.

I don't want the "sub" to be locatable because it messes up the soundstage of my future desktop speakers.

What do you guys think? Electrical or acoustic crossover?

weltersys · 8th February 2012, 04:57 PM

A 6th order bandpass box could do the job, though I have not heard one yet that I liked the sound of.

If your present cabinet is sealed, it may be rolling off in the bottom at the same rate the low pass rolls off the top, with a net acoustical crossover of almost nothing.

I have a similar problem with my Technics receiver sub output, a combination of a coil and heavy felt in front of the speaker output ends up with a proper acoustical crossover around 100 Hz.

8th February 2012, 04:29 AM	#1
kctess5 diyAudio Member Join Date: Dec 2011 Location: California	Acoustic low pass I got the Lepai amp with subwoofer output that supposedly has a adjustable low pass but the thing is a joke, its like a feeble failed attempt at a low pass. I can clearly hear midrange coming out of the little 6.5" "sub." Other than that the amp is pretty functional, and cheap which is nice. I can see the obvious answer of just putting a low order passive lowpass on it for pretty cheap but I was wondering if I could get a similar effect by using a 6th order bandpass box with some generous stuffing to cut out upper frequencies. I don't want the "sub" to be locatable because it messes up the soundstage of my future desktop speakers. What do you guys think? Electrical or acoustic crossover?

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8th February 2012, 04:57 PM	#2
weltersys diyAudio Member Join Date: Jan 2008	A 6th order bandpass box could do the job, though I have not heard one yet that I liked the sound of. If your present cabinet is sealed, it may be rolling off in the bottom at the same rate the low pass rolls off the top, with a net acoustical crossover of almost nothing. I have a similar problem with my Technics receiver sub output, a combination of a coil and heavy felt in front of the speaker output ends up with a proper acoustical crossover around 100 Hz.