strange question, but if I had a cabinet that was the depth of the driver and it was jammed against the back, cd i let it vent through a hole in the cabinet?
It would change operating conditions and radiation a bit, but more importantly I see some basic problem with it... noise at higher excursion, quite likely actually. And I wouldn't do it with drivers that have *good* ventilation around/through the voice coil former (perforated former), which means an easy path with strong coupling between back of cone and air under the dustcap. You'd move much more air through the driver than intended and designed for and it will most certainly fart.
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Hi,
I agree with KSTR, it would likely cause more problems that it fixes.
A set of spoke like grooves in the back panel might work.
rgds, sreten.
I agree with KSTR, it would likely cause more problems that it fixes.
A set of spoke like grooves in the back panel might work.
rgds, sreten.
Is it a mid driver? Can remove dust cap and vent thru the front of speaker.
Taking off the dust cap "opens them up" a bit.
Either dap a bit of glue on the vent hole and insert a foam disk, or make a wood phase plug and use long screw.
I wouldn't think to do this in a expensive/new driver, but the cap can be glued back on if it doesn't work out.
Taking off the dust cap "opens them up" a bit.
Either dap a bit of glue on the vent hole and insert a foam disk, or make a wood phase plug and use long screw.
I wouldn't think to do this in a expensive/new driver, but the cap can be glued back on if it doesn't work out.
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I would suggest not to play dirty tricks with drivers as good as Accuton's 😀
Maybe you can cut out a rather large section of the back panel and seal with a thick aluminum plate or a solid plastic cup to make enough room behind the vent.
Maybe you can cut out a rather large section of the back panel and seal with a thick aluminum plate or a solid plastic cup to make enough room behind the vent.
Venting of the pole to the outside air definitely provides a thermal advantage.
As mentioned, the vent noise may not be acceptable, but generally noise from a rear vent would be masked by high frequencies at high drive levels.
The vent hole should be surrounded by a gasket rather than being "jammed against the back" to avoid changing the cabinet tuning.
A gasket can easily be made by running a bead of silicon caulk around the vent hole, allow it to cure before installing the speaker.
Thanks for the replies, I was going to use a foam rubber ring between. Not sure about the noise issue, if its worth risking that or trying to create a small gap.
I agree with KSTR, Sretens suggestion is neat. Routing a fat groove to vent would leave the ungrooved area to brace the magnet. Two for the price of one.
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Won't the LF output from the pole-piece vent be out of phase with the main radiation from the speaker?
Cabinet tuning could get very interesting.
Cabinet tuning could get very interesting.
Hi,
Yes it would be, and connecting to the outside world will
give pressure differentials the driver is not designed for.
LF would be a fartfest.
rgds, sreten.
The back of the driver isn't flat, the vent sticks out with a small flat ring around it. Quite tricky
I wonder if the groove idea would be sufficient? At least one manufacturer recommends a minimum of 3" space.
Its an interesting thought.
Perhaps a central spike in the middle of the cutout would help guide the air...
Perhaps a central spike in the middle of the cutout would help guide the air...
Maybe i cd make a shallow foam lined cavity with holes on either side. Sounds a bit complicated tho, for any benefit
The output radiated from the vent is reversed polarity from the forward radiation of the cone whether inside or outside the cabinet.
I have done push-pull tests where one vent was inside, one was outside, frequency response was virtually identical, the output radiated from the vent is so small in comparison to the driver SD it has no consequence in output or tuning compared to the same cabinet with both vents inward.
The only down side is potential vent noise, which may or may not be a problem, completely speaker and excursion related.
The up side is better cooling at high drive levels.
Art
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