BMW F80 / F30 cabin response - Car Audio | DiyMobileAudio.com | Car Stereo Forum

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Old 05-18-2019   #1
 
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Default BMW F80 / F30 cabin response

Hi all,

I thought this might be useful for someone. I measured the response of the subwoofer in an enclosure outside (backyard, no near walls etc), then measured again when the enclosure was installed in the car. No EQ or LPF/HPF were used.
Dividing the two measurements should give an indication of the response the car adds to the response of the subwoofer. The mic was placed in the driver's position. Calibrated sound cards (response of amp included) were used as well, so the results should not be too far off from reality.

JL Audio 10W6v3 D4 in parallel. Sealed ~0.8 cu ft. Here's the cabin response. We can see that there is quite a bit of boost below 40Hz. From that we might deduce that a higher tuned cabinet (38Hz and above) might work well in this car, assuming that we do not care about sub 25Hz content.



The subwoofer in the enclosure outside:



The response in the car:



Comparing outside to in cabin:

Attached Images
File Type: png JL outside vs in car.png (32.3 KB, 62 views)
File Type: png JL outside no EQ.png (25.4 KB, 61 views)
File Type: png JL in car no EQ.png (29.7 KB, 61 views)
File Type: png F80 F30 response.png (27.5 KB, 62 views)
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Old 05-19-2019   #2
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Default Re: BMW F80 / F30 cabin response

Quote:
Originally Posted by fackamato View Post
Hi all,

I thought this might be useful for someone...
I like your work.
(Good job)

Was the power held constant between the measurements?
(I am trying to imaging the plots all put together.)
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Old 05-19-2019   #3
 
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Default Re: BMW F80 / F30 cabin response

Cheers. Power was not constant, no. I can see how this would be even more valuable. I aimed to have the 60Hz be roughly equal in volume, to understand how the car affects anything below 60. The rear seats are transparent (pretty much) at and below this frequency, not so much above.
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