hey guys, i had a 6 ch JBL amp in my car until recently when i saw smoke coming out of it. Anyways i replaced it with a 5 ch. Directed amp and while i was trying to wire it i found out that the sub has two set of wires going to it from my previous amp. Since now i only have one channel, what do i do with the other pair of wires, do i join them together or just leave the other set of wires alone. By the way i only have one 15" image dynamics sub. any help would be great. thanx

 

please clarify more. Your post is unclear. Are you trying to say that you have a Dual Voice Coil 15 inch sub with 2 sets of wires coming from it or do you just have a single voice coil sub with 1 positive wire and 1 negative wire?

 

i just checked the specs, and it says dual 2 ohm voice coil and yea there are 2 positive and 2 negatives going to the sub.

 

you can wire the 2 voice coils in series, which will make the sub's impedance 4ohm, or in parallel which will make the sub's impedance 1 ohm. What impedance does the sub channel of your directed amp run at (probably 4 or 2)? If it doesn't run at 1ohm, then you need to wire the subs voice coils in series and then hook it up to the amp.

 

check out these links:

http://mobile.jlaudio.com/support_pages.php?page_id=161
http://mobile.jlaudio.com/support_pages.php?page_id=163

 

I got it...this one's easy.. If you only plan on running this sub, then you can wire your sub so the amp sees it as either a 1 ohm or 4 ohm load.
I also have a 2 ohm DVC(Dual Voice Coil) sub. Look at the diagrams I've attached it should help you configure your sub how you want it.

 

Since my sub is a dual 2 ohm voice coil and Directed D2205 amp i'm using says 600W x 1 @ 1 ohm, SUB on their website. do i need to use the parallel setup. here's the link for directed http://www.directed.com/audio/amps/default.asp#multi thanx again for all the help

 

that link doesnt seem to be working....but yes, you are correct. The parrallel configuration will trick you amp into seeing a 1ohm load, therefore delivering 600Watts on one channel.. Can that sub handle 600W RMS? If not, you can always turn the gain down on the amp...

 

so impedence of the sub and amp has to be the same. correct?

 

not really..Amps are rated at what ohmage they can run safely at. You manual will give you all the possible configuration set ups for that amp. For instance: If you have a 2 channel amp that is rated at 300W x 2 @ 4ohms, this means your amp can safely output 300W per chn when there are two 4ohm subs hooked up to it. The same amp may be capable of combining both channels(bridging) into one chan, outputting 600W x 1 @ 2ohm. This means the amp can safely output 600watts on one channel that has a 2ohm sub hooked up on it. If you hooked up your sub in as a 1ohm configuration on that one bridged channel, chances are you'd blow the amp. The sub would trick the amp into seeing a 1 ohm load, therefore increasing the wattage output to 1200W x 1... This wouldn't last long because if the manual doesn't specify that your amp can output that, it will burn quickly...
On the other hand, if you have two 8ohm subs and you individually hooked each of the up to each of the two channels on the amp it would still work. By increasing the ohm load from 4ohms to 8ohms, you will make the amp work less than what it is designed for. At the same time, you will decrease the output of the amp by half. So if your amp is outputting 300W x 2 @ 4ohm, then it would output 150W x 2 @ 8ohms.... You can always run an amp less than what it's designed for, but you can never over work it.

 

ok now that i know what to do with the sub. There's one more questions a friend of mine was recommending that i bridge 2 chs. for the front speakers, and 2 chs. for rear speakers. Currently each speaker has it's own channel, but by bridging front two speakers will be joined together and the rear one's will be joined and according to him i'll get more power out of the amp. This is that right or will benefit from doing this. i'm not sure if i'm making any sense to you guys, but this is the best way i can explain what he was saying. thanx

 

i understand what you mean.. you have a 4 chn amp and want to bridge the 2 front chns into 1 chn and same thing with the rear chns.. ok...we've already covered the 2 rear chns, so you should be straight on that....Now for the fronts.... I'm assuming you have 2 sets of fronts, so this means you have 2 voice coils to deal with now. Imagine the two front set of speakers are the same as one DVC sub... All you have to do is wire them like you would your sub. If each set of fronts is rated at 4ohms, imagine that as a 4ohmDVC. Wire them in parrallel and your one bridged chan(fronts) will be tricked into seeing the front speakers as one 2ohm load., therefore increasing the wattage output. The down side of doing this is that you will loose control of "balance" between Left and Right for the set of fronts. With the sub, we don't care about balance since it's only 1 sub.

 

ok i know what your saying, now i realize that i have to rewire my speakers, its just too much work. thanks a lot for the help.

 

no problem....you can paypal me $100.00