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Old 13th December 2010, 04:17 PM   #1
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Default My first DIY speaker

HiVi B3N
8" Concrete mold tubing
3/4" MDF
2" PVC pipe.
Total investment $27.50

Pretty flat all the way down to 100hz. A little spike in the upper mid makes them sound a little shouty, could definitely do with a filter.
They don't image or sound stage very well, but are clean and clear. This is just a quick and dirty test enclosure, not sure where I will go from here.
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Old 13th December 2010, 04:54 PM   #2
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Very cool!
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Old 13th December 2010, 07:52 PM   #3
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Agreed.

I wonder what's wrong with the imaging etc? Is there anything obstructing the space between them? I'd add some acoustic lining to the walls, see how that helps.
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Old 13th December 2010, 08:00 PM   #4
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The shouting in the upper midrange is due to baffle-step attunation. Mounting a speaker in the end of a tube is unfortunately, though asthetically pleasing, perhaps the worst possible location from an audio quality perspective.
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Old 13th December 2010, 09:23 PM   #5
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True, but it'd be much worse in the centre of the circle. Offsetting the driver as shown will have helped.
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Old 13th December 2010, 09:39 PM   #6
tinitus is offline tinitus  Europe
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Zaph|Audio

not sure of the difference between your B3N and the B3S in Zaph's project
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Old 13th December 2010, 11:32 PM   #7
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Quote:
Originally Posted by tinitus View Post
Zaph|Audio

not sure of the difference between your B3N and the B3S in Zaph's project
One has a round frame, the other a square.

I've looked at Zaph's before and honestly all the little details he goes into was off putting for my first project.

I played my speakers all day at work today to break them in so when I got home I decided it was time to turn them up a bit.. Yeah.. At higher power they turn into a boomy, muddy mess. Another thing I noticed. The sweet spot is VERY narrow. You have to point both the drives directly at you for it to sound right. Off axis the highs almost disappear.
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Old 14th December 2010, 12:25 AM   #8
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by CoolbeaN View Post
You have to point both the drives directly at you for it to sound right.
I consider that as a good thing

but a small 80db 3" driver is ofcourse not intended for higher SPL

enjoy what its good at and worry less about what it cant do

but your box looks very big, and porting looks big
maybe its tuned lower than it likes to
you could try putting a sock in the port


btw, try to turn the box, so that the driver is either to the left or to the right, maybe it will change some
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