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Old 9th February 2013, 02:45 PM   #1
kzy is offline kzy
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Join Date: Oct 2012
Default building jbell's hs12

Hello everyone,

I am building jbells hs12 from this post and came across a problem.

There should be a one inch setback for the grill but if my calculations are right there is not enough room for the driver left. The datasheet for the beta 12-a2 specifies a depth of 4.57 inch which is about exactly the room left but building it I see that I miss about 2/3 of an inch.

Click the image to open in full size.

Now to fix it I think I am just going to place the baffle/horn a little to the front. Would the added volume be a problem? I have tried to model it in hornresp but that was a little over my head. I hope somebody who built it as well can enlighten me.

Also, there is a vent located in the back of the speaker. Placing it tightly to the back of the enclosure would close that off and possibly impede cooling. Would that be a problem?

Then I am also worried if placing the driver tightly to the back might resonate or rattle. Should I better keep some clearance with the effect of adding even more volume?

Thanks for your help!
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Old 18th March 2013, 12:52 PM   #2
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Join Date: Dec 2009
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Hopefully the designer, jbell, will chime in - but I haven't seen him on this forum for a few weeks.
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Old 20th March 2013, 11:37 PM   #3
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Join Date: Dec 2009
Location: California
If you need to move the baffle and the two 45 degree panels up 0.5", that won't hurt response. If anything, it'll allow for more SPL and/or a lower tuning - but, such a small change is probably not noticeable to the ear.
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