ok. i had this in another topic, but was getting no responses, so i started a new thread. here's how my setup was before, but it didnt work. it almost blew up my hu.

 

here's how i have it now, which works fine, but how can i safely hook up those other 2 speakers to channel 2?

 

by the way, on channel 2, i will either be playing out of the single speaker or the pair, but never all three at the same time. do they make toggle switches that select either one speaker or the other?

any of you wiring experts out there know what to do?

 

I could help you if you gave me a list of your speaker sizes, which ones you wanted on each channels, your amp size and does it have built in cross overs? what is the Rms requirment on your speakers,etc. I understand your drawing a little but some of it is confusing. I would recommend using more than one amp with all those speakers. Believe it or not your system will sound better with only one or two speakers hooked up to a single channel rather than 4 it will also be louder. Is your Hu stock? are any speakers hooked up to it? I have hookeed up stereo systems for atleast 5 years for myself and friends. I have had2 systems stolen out of my car and the car damaged both times so i refuse to put a full blown out system in my evo. Good systems will get stolen BEWARE!!!!!!!

 

after looking at your drawing again i understand it now. First of all you are using a seperate amp and not one built into a HU ? Also make sure you are using a power source straight from the battery for your amp not the same one that your HU uses. The way you had it drawn on the first picture should have worked unless you had something connected wrong. I dont see how anything could have affected your HU.

 

ok, i think i'll try hooking it up like it was in the first one. it did work with no problems, so i guess i'll do it again. one of the channel outputs touched the amp ground i think, which scared me cause some funky stuff happened, then the hu smelled like smoke. so if all the connections are right, that will work? even at high volumes?

also off channel 1 are the subs. the single speaker off channel 2 is a 15" home stereo speaker. the other 2 are jenson 6x9's. i had the same setup as diagram 2 in my last car and it worked great. only thing new are the 6x9's that turn on when i open my trunk (see my registry). if you think it's safe, then i will try it again.

btw, all i know is the rms of the amp is 160w. and the peak of the jenson's are 120. thats all, i bought everything used, so i dont have the specs. oh ya, the 15" is 700w.

 

now that you mention that the 15 inch speaker is a home speaker it brings up a small thought. home speakers i think are close to 8 ohms im not sure where as car speakers are 2-4 ohm im not sure what affect this will have but if it worked before it should work fine. This should have nothing to do with your HU.

 

i posted a huge reply in your other thread, so check it out. as for the toggle switch, yes they do make a speaker selector which will safely select different sets of speakers without ruining your amp. i think radio shack sells them or whatever store you want to go to. the 15" home speaker being 8ohms won't hurt the amp any. in fact, the amp won't have to work near as hard as it would if the 15" were 4ohms.

 

errr do you even know what ohms is? its a measure of resistance. The amp will have to work twice as hard to push that 15 inch house speaker with 8 ohms over a car speaker with a resistance of only 4 ohms. If it wasnt true everyone would ghetto up there car with house speakers.

 

actually, you're wrong. it doesn't work as hard, it also doesn't put as much power. higher resistance means less power, the formula is

P=V^2/R

so a higher resistance reduces power. also, if you have a higher resistance, and the same voltage, your current will be smaller, since

V=IR

if the current is smaller, your amp isn't working as hard. it also isn't pushing as much power to the speaker as a lower impedence magnet would.

 

you shouldn't try to power different impedence speakers with the same amp. running 2 subs in parallel that are matched is fine if you run htem bridged, but if you throw another sub in there, etc....this is just not the right way to do things. the amp will see different loads on all hte speakers and you will not get a very good output. you should just get a new amp to power the other speakers, scrap the 15" sub, and power the two subs bridged with your current amp.

 

yes i know what resistance is, in fact i have to since i am an aerospace engineer and send satellites and lunar landers and the like on missions to space. i'm pretty sure i know all of the governing equations for electrical circuits so please don't try to insult my intelligence. next, you OBVIOUSLY don't know what you are talking about since you said that the amp will work harder with the 8ohm load as opposed to the 4ohm. as cup said: P=V^2/R, which comes from the fundamental law that; P=V*I and I=V/R, which is solvable by anyone with a 6th grade knowledge of algebra to give the first equation as stated by cup.

as for the different impedances: i addressed this issue in the other thread so no sense repeating myself!!