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16th October 2012, 05:41 PM
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#1 |
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diyAudio Member
Join Date: Jun 2004
Location: Szczecin
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Impedance Bass Reflex - check up Beyma 12B100R
Below is a simulation and measurement of Beyma 12B100R in 2 cu. ft. bass reflex box tuned to 32Hz.
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16th October 2012, 07:15 PM
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#2 |
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diyAudio Member
Join Date: Nov 2009
Location: Birmingham, UK
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Looks like the actual box is tuned to 28Hz rather than 32Hz of the sim.
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16th October 2012, 08:00 PM
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#3 |
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Did it Himself
diyAudio Member
Join Date: Nov 2003
Location: Gloucestershire, England, UK
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Also looks like your driver has higher Qts than that what you simulated. Did you measure the driver or just use manufacturer specs?
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16th October 2012, 08:14 PM
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#4 |
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diyAudio Member
Join Date: Jun 2004
Location: Szczecin
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Real vs. manufacturer parameters. Real was measured at very low power - speaker coupled directly to soundcard.
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16th October 2012, 08:25 PM
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#5 |
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Did it Himself
diyAudio Member
Join Date: Nov 2003
Location: Gloucestershire, England, UK
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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.
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16th October 2012, 08:36 PM
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#6 |
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diyAudio Member
Join Date: Jun 2004
Location: Szczecin
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I did my best to seal the box.
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16th October 2012, 09:04 PM
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#8 |
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diyAudio Member
Join Date: Jun 2004
Location: Szczecin
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Yes because this is a complete speaker with crossover and notch. It's ca. 2,8 Ohm.
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16th October 2012, 09:30 PM
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#10 |
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diyAudio Member
Join Date: Jun 2004
Location: Szczecin
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Notch is centered at 300Hz.
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