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Old 14th June 2013, 08:37 PM   #1
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Default Beyma TPL Rear Chamber Experiments

I have noticed a number of people are running Beyma TPL's " open baffle" and with custom rear chambers. I have therefore experimented to see what the effects are of removing the rear compression chamber off my Beyma TPL's.

Bit of background - i am running mine in a custom "le cleach" expansion horn which are significantly larger than the standard OEM horns. The only noticeable effect was smoother roll off below <1000Hz. I am currently running them crossed @ 1200Hz and am looking at lifting this as they can sound harse. (I suppose secretly i was hoping the rear chamber experiment may sort out the harshness)

Attached below is a trace of the 3 configurations - all measurements taken from listening position 2.5m away.

The rear chamber i made had non-parallel sides in a 3:2:4 ratio with approx volume of 5 ltrs. I stuffed around 50% of this with BAF.

You can see the OEM chamber has the flattest response, i don't understand why my oversize chamber is so bad. Do i need to put back the felt on the back of the driver? Any suggestions on ways to improve the FR. I think they sound better without the chamber, but the loss of imagery outways this, so some type of chamber needs to go back on them
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Old 15th June 2013, 08:59 AM   #2
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Very interesting, pictures of the horn? And some data on size, cut-off frequency etc?

(Please &#128515


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Old 19th June 2013, 11:23 AM   #3
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attached is a link to another thread which details some of my trials

Beyma TPL 150 - horn trials
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Old 20th June 2013, 07:28 AM   #4
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The 9kHz peak is typical when the rear damping felt pad is removed. This must to EQ'ed.
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