c a m a r o

Hi. I bought an xtant x603. It has 2x75w rms + 1x150w rms at 4ohms, I want to know if I can possibly use two subwoofers on the rear channel, or it has to be only one? And if so, how?

I am thinking about using two jl audio 8wo's (75w rms each), otherwise i'll have to get a single 15wo which will fit the amp perfectly (150w rms), and say goodbye to trunk space (camaro). The two 8" subs might actually fit in the spare tire compartment.

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sdashiki

15" is a waste of time and money. If you are going for Dbls, go for it. If you want low end accompanyment to your music, stick with 10s.

So its a 3 channel amp?

75W
75W
150W

all at 4 ohms.

You can bridge two 8ohm (dear god NOT 4ohm) subs into the 150

you can run each sub off one of the 75W channels each

Stick with JL, good buy, good sound, great reliability.

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c a m a r o

the front channels are reserved for focal 165k2's, the rear channel i want to use for the sub(s). so 15 is a waste of space, how about two 8w0s? any suggestions? I'm not dead set on jl audio, but from what i've heard it's a good company. Looks like two 8w0s will work perfect. I know theres a few people on here with this amp, give me some suggestions people. Thanks.

c a m a r o

Yes.

Do the 8w0s come in 8ohms?

sdashiki

So you are working only with the 1x150W right?

Well bridge 2 subs that are 8ohm, make sure they are NOT 4ohm JL makes both for almost all their subs except the DVCs, into the 150 should be fine. But if im not mistaken its still going to give you 150W per sub even when bridged, so you may need to find a 8W that can take 150W RMS.

http://www.jlaudio.com/subwoofers/RP_Chart.html

Im not 100% sure on how bridging effects the watts seen by each speaker, but i think it stays the same...

Which leaves you with:

10W3
12W3

seems 150W, you might have to go bigger or find another brand...

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c a m a r o

Oh ok. I see, they come in 4ohm or 8ohm configuration. So how do I bridge them? What do I need?

sdashiki

Bridging is as follows:

Amp has one + and one -

Each sub has one + and one -

Wire the +/- from the amp to one sub.

Wire the +/- from the sub to the 2nd sub.

So now you got a connection from one channel into two speakers. You could also run the 2nd wire directly from the amp but the way described is standard...

Id do a google search on wiring diagrams before you quote me and I blow up your amp or something!

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ralphyboy1

I just looked at that amp and it is 2 ohm stable (they claim 300x1) so 2 4 ohm subs would be prefered, wired in parrallel to get that 2 ohm load. Sdashiki's wiring is correct but always be sure. Just to verify though connect all three +'s together and all three -'s together. You have yourself a great system going together there.

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c a m a r o

Wait a sec, so if I use two 4ohm subs, each sub would have to be 150w rms? Thanks.

c a m a r o

Is this what you mean by parallel?

tarpitblue

yes thats parallel. basically you're connecting all the + together and the - together. this will cut the ohms in half with 2 speakers.

c a m a r o

is that good or bad? Do you want more ohms or less ohms? Ohms is resistance right? So wouldn't less resistance be better?

scott_fx

hey there, i have a xtant 603x (older version, same thing though) and that is 2 ohm stable on the 3rd chan. get two 8's at 4 ohms a piece then wire them to have a 2 ohm load at the amp. then just turn the gain down a bit and you'll be good to go. those subs can more then likely take more power then they are rated at. also a nice sub to look at is the image dynamics subs. i have a dvc 12" image dynamics sub and it works great. OR if you have a little more space to mount a taller sub. look at the new pioneer premier 2000spl (or something like that) line. they have gotten amazing reviews and will sound a lot better then the 2 8w0's and better then my image dynamics sub.

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c a m a r o

won't 750w rms be overkill for the amp?

tarpitblue

if the amp is rated at 2 ohm stable, you should be ok. and yes, u basically double the output since you're cutting the resistance in half. a good idea is to put a capacitor in line close to the amp if ur gonna load it at 2 ohms and crank it. if ur using those 8"ers, i wouldnt worry about it cause u got too much power there as it is. no need to stress ur amp at 2 ohms if its not needed. if u go that route, setup your system so u wont blow them. turn ur gain all the way down and ur radio up. slowly adjust ur gain up and stop before they clip or start to and back it off a hair. this way the chance of blowing them are minimized.

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