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Old 3rd November 2012, 02:35 PM   #1
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Default Shallow mid-range enclosure inside a 3-way?? too shallow??

I need to create an sealed enclosure around 0.1 ft3 for my 4" mid-range that is part of a 3-way monitor. When I do the math based on internal cabinet dimensions and location of the drivers I end up with an enclosure that is 3.25" deep...is this too shallow and will I have an issue with reflections?

THX
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Old 3rd November 2012, 02:44 PM   #2
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Originally Posted by Kooshball View Post
I need to create an sealed enclosure around 0.1 ft3 for my 4" mid-range that is part of a 3-way monitor. When I do the math based on internal cabinet dimensions and location of the drivers I end up with an enclosure that is 3.25" deep...is this too shallow and will I have an issue with reflections?

THX
I should also mention that the baffle is 1.5" thick so the back of the mid-range enclosure will be ~4.5" from the speaker surround once you account for flushing it into the baffle in case this makes a difference....
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Old 3rd November 2012, 02:47 PM   #3
DavidL is offline DavidL  United States
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Why use a small enclosure? Isn't the midrange low end being rolled off at 400 Hz or above by the crossover? Use a larger enclosure and stuff it well. A simple thick paper tube cut to length and glued to the back of the front baffle will work well.
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Old 3rd November 2012, 02:49 PM   #4
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Or get really funky and extend the tube out the back of the cabinet to give you a pseudo OB on the mid. I have and I really like the effect.
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Old 3rd November 2012, 02:52 PM   #5
dewardh is offline dewardh  United States
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will I have an issue with reflections?
Probably yes . . . it's hard to get enough stuffing in that small a space. Why that volume? What Thiel does (or did in the 3.6 anyway) is a tube all the way to the back of the enclosure stuffed full of fiberglass . . . essentially completely absorbes the back wave.
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Old 3rd November 2012, 05:55 PM   #6
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And leave the back of the tube open through the rear panel?
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Old 3rd November 2012, 06:19 PM   #7
dewardh is offline dewardh  United States
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And leave the back of the tube open through the rear panel?
Well, Thiel didn't, but if you put enough stuffing in the cavity it probably wouldn't matter.

But if you're going to let the back wave out into the "real world" it is far better to do it in a properly designed full range dipole than with a bandwidth limited power response muckeruper.
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Old 3rd November 2012, 09:07 PM   #8
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well it looks like I had a small calculation error / reading error...my volume is now 80% larger with the back wall 5.375" back from the inside of the baffle.

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Old 3rd November 2012, 11:40 PM   #9
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