Loudspeaker phase in car audio system

sma · 5th February 2004, 04:50 AM

Hi,

i need advice about this.in car audio system,speaker is face to face / off axis position.not like at home,which speaker is direct to listener.how about phase inverting in car audio system,if they put in factory door location when the left and right speaker is off axis and face to face position?is the speaker phase is reverse to 180 degree ?How about if i change the 1 side speaker polarity,is that mean back to 0 degree?

I still don't understand for make sure the correct phase in car audio system.

Anyone have advice about hi end driver can use in car audio system?I already try Vifa-scanspeak,anyone know other brand maybe?

postman · 5th February 2004, 04:57 AM

I guess the speakers phase will be 180 out from each other since they are aiming at each other, but i dont know much about phase.

mikee12345 · 5th February 2004, 05:54 AM

what frequency?

if its bass it shoudnt matter...people in car audio forums talk about it mattering,but i dont see why

sma · 5th February 2004, 07:04 AM

the problem is in mid low frequency i think,several time i install audiophile system in car,and i found the sound is not open in mid high,many loose in mid low....so i think this is because woofer placement in car which left and right speaker is off axis.

i use RTA for make passive crossover and found frequesncy response is already flat at +/- 3 db.so i think the unopen mid high and bad mid low is the acoustic problem.because the equipment is use like cd player,cable and amp is already tested in home and already repro good sound.Speaker use is already good driver,that is VIFA m18 woofer for car audio use and Scan speak 9500 tweeter.So i am going to research about acoustic i think,where i very amateur about that.

i still not have time to try angle the speaker.but maybe i will try,after i sure the problem is in phase because of woofer placement.

I need advice everybody...

mikee12345 · 5th February 2004, 09:03 AM

the problem in the car,like a room,is woofer placement. with my basshorn, ~10cm infront of the mouth,i was -10db from the mouth measurement- nodes at work!

so just try it until its good!

Cheers

5th February 2004, 04:50 AM	#1
sma diyAudio Member Join Date: Dec 2003 Location: jakarta	Loudspeaker phase in car audio system Hi, i need advice about this.in car audio system,speaker is face to face / off axis position.not like at home,which speaker is direct to listener.how about phase inverting in car audio system,if they put in factory door location when the left and right speaker is off axis and face to face position?is the speaker phase is reverse to 180 degree ?How about if i change the 1 side speaker polarity,is that mean back to 0 degree? I still don't understand for make sure the correct phase in car audio system. Anyone have advice about hi end driver can use in car audio system?I already try Vifa-scanspeak,anyone know other brand maybe?

5th February 2004, 04:57 AM	#2
postman diyAudio Member Join Date: Nov 2002 Location: Sydney Australia	I guess the speakers phase will be 180 out from each other since they are aiming at each other, but i dont know much about phase. __________________ meh

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5th February 2004, 05:54 AM	#3
mikee12345 diyAudio Member Join Date: Nov 2002 Location: NZ	what frequency? if its bass it shoudnt matter...people in car audio forums talk about it mattering,but i dont see why

5th February 2004, 07:04 AM	#4
sma diyAudio Member Join Date: Dec 2003 Location: jakarta	the problem is in mid low frequency i think,several time i install audiophile system in car,and i found the sound is not open in mid high,many loose in mid low....so i think this is because woofer placement in car which left and right speaker is off axis. i use RTA for make passive crossover and found frequesncy response is already flat at +/- 3 db.so i think the unopen mid high and bad mid low is the acoustic problem.because the equipment is use like cd player,cable and amp is already tested in home and already repro good sound.Speaker use is already good driver,that is VIFA m18 woofer for car audio use and Scan speak 9500 tweeter.So i am going to research about acoustic i think,where i very amateur about that. i still not have time to try angle the speaker.but maybe i will try,after i sure the problem is in phase because of woofer placement. I need advice everybody...

5th February 2004, 09:03 AM	#5
mikee12345 diyAudio Member Join Date: Nov 2002 Location: NZ	the problem in the car,like a room,is woofer placement. with my basshorn, ~10cm infront of the mouth,i was -10db from the mouth measurement- nodes at work! so just try it until its good! Cheers

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