Have Bose system with malfunctioning cassette player and amps. Must remove amps to install after market system. Radio in no problem. Speakers are a problem. Removed rear speaker amp but don't know which set of wires is the power to amp and which is actual speaker wire. There is thick red&black wire and 2 thin wires one with color stripe. Thinking RED / black wire is power to amp. If so, which of the other two wires is +ve and which -ve? I remember that one of those thin wires was white with green stripe.
Why dont you just take the speaker and the two wires that you think are the right ones, connect them to a sound source and if you get sound you guessed correctly.
dhr96] wrote:
here is thick red&black wire
This is the amplifier power wires.
dhr96] wrote:
thin wires one with color stripe.
Those are the speaker wires. The striped side is the -VE
If you want to varify this is the speaker in the most simple way. Take a 9 volt battery and connect the leads and it will make a scrathy pulse noise.
If you reverse the leads you will also see the speaker go in, or out. Varifying the polarity of the wiring.
Regards
EVIL Teken . . .
Yes good idea send direct current to a speaker designed for alternating current.
jakita wrote:
Why dont you just take the speaker and the two wires that you think are the right ones, connect them to a sound source and if you get sound you guessed correctly.
Lets see, if this makes any sense at all... You are telling him to simply GUESS, and apply full current from the power amplifier without knowing which one is the correct wire???
The amplifier would instantly destroy the speaker upon activation, or over exert the motor assembly.
When the other wire is signal output wire.
jakita wrote:
Yes good idea send direct current to a speaker designed for alternating current.
LMAO... Your reasoning, and understanding about AC & DC is making me really wonder at this moment.
Applying a small 9 volt battery which supplies less than 1 amp for a brief second, will not damage anything.
You think a speaker that is designed to handle XXX amount of watts, and XXX amount of current will be affected by a small DC pulse for a few seconds???
Could you please explain to me the theory you have in regards to this???
I would really like to know how that would be . . . This is a shade tree technique for those not having the proper equipment on hand, and is only suggested to be applied in the correct manner, to determine the correct polarity and wiring interface from the front to the back of the vehicle.
Regards
EVIL Teken
Do you really think that what I said is worse. Your saying that if you connect the sound source to one speaker wire and the other source to say a 12v power it will destroy the speaker. You are dumb. In order for the speaker to recieve any power the circuit would need to be closed. If you only cought one of the speakers leads it would be a closed circuit. Anyhow did I say crank your almost complete system all the way up then try to find the right wire, NO! I said to look for it with a sound source. This sound source could be a sound generator which is what professional installers use. You would know that if you were a professional. Another sound source example could be a walkman radio with bare wires instead of headphones. The proper technique for finding correct polarity if you are in doubt on your wiring is to listen after you have installed the stere. You fade all the way to the front or rear then adjust the balance left to right. You should get an increase in the lower frequency when centered compared to one of the sides. You repeat this in the opposite front or rear. You can check the front polarity from the rear polarity in the same way but sometimes it sounds better if they are out of phase because of the wavelength from your ear. Well anyhow the 9v battery thing is shadetree. If you disagree you should let the CEA know because that is what they teach you on the MECP certification. I have no theory just facts. I passed the installer test with a 98 percent. Oh and far as I know from experience as a professional installer the thing that is the most common cause for blowing a speaker is clipping or the amp putting out a DC signal because the amp has a problem. It is a problem I seen frequently from shadetree installers.
I guess the only difference between a silver member and a newbie is how many posts you have made. Have fun Evil Cheesehead
Next time you have another comment that is directed at me I suppose I will have to actually research to prove you wrong. I hope you do have something against what I said because I like a challenge. Learning is always fun.