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Old 5th June 2012, 08:51 AM   #1
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Default Subwoofer for Bass Guitar?

I have a headphone bass amp (The VOX amplug) which is pretty good for using with headphones for practice. I also have a pair of PC speakers which I use sometimes, which sound really crappy for bass.

I also have an old home theater sub (Sony SA-WMS7). According to the manual the sub can reproduce 24-150Hz. I was wondering whether I could use a splitter and give one output to the PC speakers, and another through a low pass filter to the sub. I tried the sub on it's own but the sound was really muddy, hence the idea.

I know a little bit about filter design but I'm unsure about whether an active lowpass filter would be able to handle the sub as a load. I'm thinking of using a
Butterworth lowpass filter with unity gain before I give the input to the sub (The sub also has an amp inbuilt).

Any suggestions guys?
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Old 5th June 2012, 09:43 AM   #2
NEO Dan is offline NEO Dan  United States
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Sit on the sub while wearing the headphones or duck tape the sub to your head while wearing the headphones.
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Old 5th June 2012, 01:24 PM   #3
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I think more important would be to add a low cut for the PC speakers - you'll need to take the low end away from them to enable them to play clean(er).

Apart from that, go for it - active filters are easy to knock together.

Chris
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Old 5th June 2012, 02:18 PM   #4
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Thanks, I think I'll make filters for each of them. We'll see how it turns out.
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Old 5th June 2012, 03:33 PM   #5
sreten is offline sreten  United Kingdom
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Hi,

Your sub has a line in and already has built in low pass filter.

What does the mode switch on the sub do ?

Simply split a line signal into the sub line in and your active speakers.

Reduce any bass setting on the speakers and set up the sub to suit.

rgds, sreten.
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Old 5th June 2012, 03:49 PM   #6
tb46 is offline tb46  United States
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Hi Y'all,

If you google for Sony SA-WMS7 you should find this link to a service manual: http://www.shema.ru/0_s/Radio/sony/SA-VE702.pdf
And, how long will a home 8" subwoofer last with a direct input from an electric bass?

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Old 6th June 2012, 01:02 AM   #7
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by tb46 View Post
And, how long will a home 8" subwoofer last with a direct input from an electric bass?
Hi,

I found that as well. From my quick perusal of the schematic indefinitely, as
it has a limiter board. In fact rather than needing a a filter if you bypassed
the low pass filters it would probably be a very decent practice amplifier.
(Except if the limiter does not like unexpected high frequencies, who knows.)

rgds, sreten.

I can't say trivially how to bypass the filters as i don't have the time,
but theoretically just removing several capacitors should work.
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Last edited by sreten; 6th June 2012 at 01:21 AM.
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