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Toymods » Tech & Conversions » CAR AUDIO: Determining +/- on oem speakers/wiring Show: Today's Posts  :: Show Polls  Email to friend

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praetor Regular Location: Sydney Registered: October 2003	Re: CAR AUDIO: Determining +/- on oem speakers/wiring Mon, 08 March 2004 10:58 I still dont agree that speakers run on DC current. A low level signal into an amp runs on DC at about 2-2.5v, but speakers run on AC. A speaker works by having AC current going into the coil. On the +ve side the coil moves out, on the -ve side the coil moves in, hence the speaker moves in and out and makes sound Why do you think that when you wire up a sub, if you have it face backwards in the boot of your car you have to wire it 'out of phase'? This means that when all the other speakers move out, it moves in - because its backwards physically in the boot! Link from howstuff works... Essentially, the amplifier is constantly switching the electrical signal, fluctuating between a positive charge and a negative charge on the red wire. Since electrons always flow in the same direction between positively charged particles and negatively charged particles, the current going through the speaker moves one way and then reverses and flows the other way. This alternating current causes the polar orientation of the electromagnet to reverse itself many times a second. So how does this fluctuation make the speaker coil move back and forth? The electromagnet is positioned in a constant magnetic field created by a permanent magnet. These two magnets -- the electromagnet and the permanent magnet -- interact with each other as any two magnets do. The positive end of the electromagnet is attracted to the negative pole of the permanent magnetic field, and the negative pole of the electromagnet is repelled by the permanent magnet's negative pole. When the electromagnet's polar orientation switches, so does the direction of repulsion and attraction. In this way, the alternating current constantly reverses the magnetic forces between the voice coil and the permanent magnet. This pushes the coil back and forth rapidly, like a piston. [Report message to a moderator]

	Subject	Poster	Date
	CAR AUDIO: Determining +/- on oem speakers/wiring	rvrolla	Mon, 08 March 2004 02:51
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	praetor	Mon, 08 March 2004 03:10
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	V8_MA61	Mon, 08 March 2004 08:41
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	rvrolla	Mon, 08 March 2004 03:17
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	T APLUS 22	Mon, 08 March 2004 03:20
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	praetor	Mon, 08 March 2004 03:21
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	T APLUS 22	Mon, 08 March 2004 03:41
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	feral4mr2	Mon, 08 March 2004 03:46
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	THE WITZL	Mon, 08 March 2004 04:24
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	T APLUS 22	Mon, 08 March 2004 13:46
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	rvrolla	Mon, 08 March 2004 04:36
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	praetor	Mon, 08 March 2004 05:04
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	feral4mr2	Mon, 08 March 2004 07:54
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	THE WITZL	Mon, 08 March 2004 09:17
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	ed_ma61	Mon, 08 March 2004 09:23
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	praetor	Mon, 08 March 2004 10:58
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	ed_ma61	Mon, 08 March 2004 11:48
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	V8_MA61	Mon, 08 March 2004 11:50
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	THE WITZL	Mon, 08 March 2004 12:18
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	V8_MA61	Mon, 08 March 2004 12:34
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	feral4mr2	Mon, 08 March 2004 12:36
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	HedgehogSandwich	Mon, 08 March 2004 12:39
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	praetor	Mon, 08 March 2004 22:00
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	HedgehogSandwich	Mon, 08 March 2004 23:48
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	praetor	Tue, 09 March 2004 00:11
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	Scorpion	Tue, 09 March 2004 01:42
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	feral4mr2	Tue, 09 March 2004 12:20
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	praetor	Tue, 09 March 2004 02:14
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	Seadog	Tue, 09 March 2004 04:03
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	THE WITZL	Tue, 09 March 2004 04:33
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	Scorpion	Tue, 09 March 2004 09:03
	Re: CAR AUDIO: Determining +/- on oem speakers/wiring	HedgehogSandwich	Tue, 09 March 2004 11:50

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