Building a Full-Range BMR (TEBM46C20N-4B) Enclosure - diyAudio
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Old 30th April 2016, 03:32 AM   #1
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Default Building a Full-Range BMR (TEBM46C20N-4B) Enclosure

I purchased a pair of TEBM46C20N-4B BMR full-range drivers from PE long ago and put them aside. I finally got time to take action putting them in a box. I found sutiable box online. This is a plain box with a port as shown below. The net internal volume is around 1 L.

I measured each driver's free-air and delta mass (1 g) impedance for deriving TS parameters. I used them in EnclosureShop of LEAP simulation software to see how the box alignment for the existing port. TSL model of ES was used. The second graph shows SPL of 1 W and 20 W. No filling in the box was assumed. The alignment as shown is not perfect, but not too bad. The peak disappeared for rated input power. I will check the result against measurement.
Attached Images
File Type: png Ready-made box.png (233.1 KB, 254 views)
File Type: png SPL_original_port.png (30.5 KB, 253 views)
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Old 30th April 2016, 05:57 AM   #2
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I used a 60 mm holesaw to open mounting hole. The edge of the hole is chamfered at bit for good air flow. Foam gasket was placed surrounding the chassis to avoid air leak. The box was finished as shown.
Attached Images
File Type: jpeg File_001 (22).jpeg (47.6 KB, 244 views)
File Type: jpeg File_000 (45).jpeg (23.0 KB, 235 views)
File Type: png hole handling.png (17.9 KB, 238 views)

Last edited by panson_hk; 30th April 2016 at 06:00 AM.
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Old 3rd October 2016, 12:14 PM   #3
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Hi Panson,

I think you used an interesting driver and your case looks great. Can you please share with us how they sound?
An FFT of my life would show a couple of peaks and some low level harmonics, but mainly random noise.
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