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jzagaja 16th October 2012 06:41 PM

Impedance Bass Reflex - check up Beyma 12B100R
1 Attachment(s)
Below is a simulation and measurement of Beyma 12B100R in 2 cu. ft. bass reflex box tuned to 32Hz.
  • Can you comment differences?
  • How do you validate proper BR functioning?

Charles Darwin 16th October 2012 08:15 PM

Looks like the actual box is tuned to 28Hz rather than 32Hz of the sim.

richie00boy 16th October 2012 09:00 PM

Also looks like your driver has higher Qts than that what you simulated. Did you measure the driver or just use manufacturer specs?

jzagaja 16th October 2012 09:14 PM

1 Attachment(s)
Real vs. manufacturer parameters. Real was measured at very low power - speaker coupled directly to soundcard.

richie00boy 16th October 2012 09:25 PM

Well that is a close match, but a soundcard output would not be able to drive a speaker very well.

Your original problem may be due to vent and box losses being different to predicted.

jzagaja 16th October 2012 09:36 PM

I did my best to seal the box.

Dissi 16th October 2012 10:02 PM

The measured impedance drops to 2 ohm at 200 Hz, that's very strange.

jzagaja 16th October 2012 10:04 PM

Yes because this is a complete speaker with crossover and notch. It's ca. 2,8 Ohm.

Dissi 16th October 2012 10:18 PM

Then i would say everything is ok. The notch causes the asymmetry of the impedance peaks.

jzagaja 16th October 2012 10:30 PM

Notch is centered at 300Hz.

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