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PostPosted: Fri Aug 04, 2006 7:57 am 
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Location: Memphis, TN
why does this happen? I've noticed it all my life but never knew why it happened.


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PostPosted: Fri Aug 04, 2006 12:33 pm 
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Because the wavelengths that make bass frequencies are so long they actualy compress inside the vehicle. That's why you can get lots of bass from small speakers. Its called transfer function or cabin gain. Now IIRC even though your getting all this extra output from the small space your are actualy getting some cancellation in there too. Opening the door gives the bass an escape route and reduces the amount of cancellation you get and your SPL increases. You'll notice it does it when you roll down a window too.

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PostPosted: Fri Aug 04, 2006 2:57 pm 
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So if I angled the speaker on the door to face more towards me, would that give me a better permanent bass response? I've seen speakers in kick panels aimed at the driver but I thought that was for directing the highs and not the bass.


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PostPosted: Sat Aug 05, 2006 12:52 am 
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It is for aiming the highs...your door speakers (unless truly incredible) shouldn't be seeing anything under 80Hz for a 6.5". 5.25 rarely pull below 100Hz and 4" are hardpressed to play anything under 120Hz. The midbasses will usualy play to 2kHz or so with the tweets picking up from there.

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PostPosted: Sat Aug 05, 2006 7:56 pm 
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m wrote:
It is for aiming the highs...your door speakers (unless truly incredible) shouldn't be seeing anything under 80Hz for a 6.5". 5.25 rarely pull below 100Hz and 4" are hardpressed to play anything under 120Hz. The midbasses will usualy play to 2kHz or so with the tweets picking up from there.


I had two 4inch midranges, with an FS of about 100Hz, doing 124dBs at 44Hz, in a car ;) hehe


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PostPosted: Sat Aug 05, 2006 11:31 pm 
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What brand of 4" and what kind of enclosure did you have it in?

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PostPosted: Sat Aug 05, 2006 11:40 pm 
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m wrote:
What brand of 4" and what kind of enclosure did you have it in?


two cheapo 4inch 5watt rms, 10watt max, Digitor brand, 8 ohm, home audio midranges :)

the enclosure was MAGIC!!!

it was in a station wagon, with the enclosure behind the rear seats, and under the window line too :)


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