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Old 9th March 2014, 08:36 PM   #1
PsychoM is offline PsychoM  Belgium
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Default Bass response in small boombox

Hi,
I'm new to making DIY speakers. This is the first speaker I designed and it's very cheap, so please don't be harsh
I recently built a small boombox from an old set of pc speakers. I used the original amp.
I kept the same volume as the sub (+-9 liters) and about the same tuning frequency (60 Hz or something) but I'm having trouble with the bass response.

The woofer is shaking around violently, but it's not very effective. The original speakers had way more bass. I think the bass is canceling somewhere... ? Or maybe I need make an internal enclosure for the mid/high speakers?
Can somebody see what's wrong with the basic setup (see pictures)?
All advice/hints are welcome
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Old 9th March 2014, 11:07 PM   #2
DavidL is offline DavidL  United States
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First of all you need to have the "sub" driver in it's own enclosure separate from the two full range drivers. The full range driver cones are acting like passive radiators and screwing up the bass. Also in turn, the bass driver is modulating the full range drivers making them sound horrible in all probability.
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Old 9th March 2014, 11:48 PM   #3
mikje is offline mikje  United States
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In addition to the sub needing its own enclosure, each of your drives do too.
Mike
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Old 10th March 2014, 12:05 AM   #4
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After you've done those mods, make sure everything's air-tight. You can test by playing a few low-frequency tones: if you hear a whistle, you have a leak, which will cancel some of the bass.

Chris
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Old 10th March 2014, 01:58 PM   #5
PsychoM is offline PsychoM  Belgium
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Quote:
Originally Posted by DavidL View Post
First of all you need to have the "sub" driver in it's own enclosure separate from the two full range drivers. The full range driver cones are acting like passive radiators and screwing up the bass. Also in turn, the bass driver is modulating the full range drivers making them sound horrible in all probability.
Thanks, I was already guessing that was the problem.
I'm going to put both mid/high-drivers in their own seperate enclosure, that means I don't have to build another enclosure for the woofer right?

Also, everything is practically airtight, but I'm going to fill the inner edges with silicone paste to be sure.
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Old 10th March 2014, 10:55 PM   #6
DavidL is offline DavidL  United States
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Yes sealing off the mids/highs means not building a separate box for the woofer as long as the boxes for those don't reduce the bass enclosure too much. I'd try it like you mentioned and go from there. Using silicone to seal a box works VERY well, so well in fact that you may find trying to open the box later almost impossible without breaking it.
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Old 10th March 2014, 11:45 PM   #7
sreten is offline sreten  United Kingdom
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Hi,

Boxes than need anything in the corners are just
very poorly glued together, that is a problem.

rgds, sreten.
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Old 11th March 2014, 04:18 AM   #8
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Quote:
Originally Posted by mikje View Post
In addition to the sub needing its own enclosure, each of your drives do too.
Mike
ALso the electronics should not be enclosed in the same box.

Mods! I like it ! Putting cheap at its best.

Ohhh...we were talking about a boombox-ghettoblaster-old portable cassette/receiver
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