ok guys here's the deal, i am gonna be running 2 10' subs (rockford fosgate p2 and infinity kappa). but the thing is that they have different impendances . the p2 sub is dual 4 ohm while infinity is dual 2 ohm. what i am thinking of doing is wiring the RF sub in parallel and leave the infinity as is (+ to - and + to -). the amp i am gonna use to power it is audioplanet 800 W 2 channel (2 ohm stable). is this a safe setup, i mean i don't wanna ruin that amp or anything. and another thing is what box am i better to use with those... ported or sealed and why?

never mix subs




Check out my build thread!

why not?

because it gives you probs like you are having, figuring out how to wire them together to get a proper ohm load for power


always use same same or singles of 1 brand, no headaches that way




MikeC!
91 sunbird Convertible
3.1 with an automatic
http://www.cardomain.com/ride/3038464

it's not a problem, more of a concern... but as for a type of box to use what should i go with, ported or sealed?

well that depends,,, what does the MFG of each sub recomend?

are they both more adept to a sealed box or a ported box....

some it doesn't matter & if that is the case, build a ported box, but if 1 is better in a sealed box & the other is better in a ported box, that may cause a problem

me i like a ported box, if possible cause i think they sound better if box is built right.

but not all subs are best in a ported box







MikeC!
91 sunbird Convertible
3.1 with an automatic
http://www.cardomain.com/ride/3038464

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I think you should quit with car audio all together and let a professional install everything.

You don't mix subs. You have different impedences, different box requirements, different frequencies, it's going to sound like ass.

they're gonna be in 2 different boxes, wired to the same impedance, as for frequencies they'll be filtered from 20 to 70 hertz and i don't see why it would sound "like ass". if you're so smart than maybe you could revise your answer, otherwise you're of no use.
and by the way, i installed 3 amps, 3 sets of speakers, headunit and 2 subs all by myself, so i know a thing or two about car audio...

damn near anybody can "install" subs/amps/speakers/headunits but to do it right and having you equpiment running to its fullest potential is another thing. and im willing to bet money lanman knows more than you about audio

you don't even know me, how can you tell what i do and don't know?

Andrey B wrote:you don't even know me, how can you tell what i do and don't know?

refer to post #1 that explains it all

Andrey B wrote:ok guys here's the deal, i am gonna be running 2 10' subs (rockford fosgate p2 and infinity kappa). but the thing is that they have different impendances . the p2 sub is dual 4 ohm while infinity is dual 2 ohm. what i am thinking of doing is wiring the RF sub in parallel and leave the infinity as is (+ to - and + to -). the amp i am gonna use to power it is audioplanet 800 W 2 channel (2 ohm stable). is this a safe setup, i mean i don't wanna ruin that amp or anything. and another thing is what box am i better to use with those... ported or sealed and why?

sealed - crisp tight bass
ported - louder, lower frequency
up to you to decide

if both subs are in their own enclosure .. it might not be perfect (ie matched speakers) but it should be fine.

as for the wiring ..

since each sub has 2 voice coils .... wire one coil from the RF sub and the P2 sub in series ... do the same for the other pair of voice coils on each sub

then run the pair of voice coils you just made in parallel ... that'll give you a 3 ohm load total. ( the two 6 ohm coils in parallel)

another way to do it is wire the RF sub in series with itself, then run all 3 coils in parallel...but that will give you 1.25 ohm and thats lower than what your amp is rated for .. not the best idea

14.82 @ 97 mph

look buddy, apparently you just go after what somebody else said and what may sound logical to you, but did you ever try and use your head? what is the problem with running 2 different subs when they can be bridged to the same impedance and have a completely separate wiring from each other? the only slightest complication i see here is adjusting gains accordingly to their output and maybe slightest different frequency response, and what's such a big deal about that? just because you follow somebody else's example doesn't make me wrong unless you specify any particular reasons, which you can't, because you don't anything...

buy another one of one of the subs and sell the other.... then make a box suitable for what you have. making two boxes for two different subs makes absolutely no sense and like lanman said it will sound like ass. frequency filtering wont change this as every sub reproduces sound a little differently.

"I did it because I wanted to see what it would look like. You should be greatful that I even told you that it would look good. If your to dumb to use photoshop and change the color of your own car then you don't need to see it changed. I'm not going to give my work away. I'll sell the pic to you though for $15."-Adam Kalin

^^JBO is about not being that guy

i will get another identical sub first chance i get, this is just a momentary setup, it may not be the best i know but i am working hard to do it the right way...

Then instead of doing it gimped up 47 times, do it right the first time. Run the infinity sub in series for 4 ohms mono.

And allow me to revise my answer.

Each sub is going to have different perameters. Xmas, vas, fs, qms, etc... Let's say sub A, ideally, likes a ported box 1.25 cubic feet tuned to 38 hertz, has a +6 db gain from 35 to 65 hertz, then drops off -3 db from 66 up to 80, and from 35 to 30. Sub B likes a ported box 2 cubic feet tuned to 35 hertz, etc... You're going to have different peaks from the different subs, different sound from each sound, and the possibility of cancellation because of the different peaks and drops.

No, I don't know you. But if you did know even the tiniest bit, you wouldn't have asked the question, nor would I have to sit here and explain to you why two different subs don't work.

Lanman31337 - Cavfire wrote:Then instead of doing it gimped up 47 times, do it right the first time. Run the infinity sub in series for 4 ohms mono.

And allow me to revise my answer.

Each sub is going to have different perameters. Xmas, vas, fs, qms, etc... Let's say sub A, ideally, likes a ported box 1.25 cubic feet tuned to 38 hertz, has a +6 db gain from 35 to 65 hertz, then drops off -3 db from 66 up to 80, and from 35 to 30. Sub B likes a ported box 2 cubic feet tuned to 35 hertz, etc... You're going to have different peaks from the different subs, different sound from each sound, and the possibility of cancellation because of the different peaks and drops.

No, I don't know you. But if you did know even the tiniest bit, you wouldn't have asked the question, nor would I have to sit here and explain to you why two different subs don't work.

I feel it is necessary it stroke Lan's e-penis to encourage you to believe him. The guy knows what he's talking about. I'm sure you know how to install, but this is one of the guys that pretty much everyone on this site turns to for audio advice.

To add, subs have something called a 'damping factor', meaning that they have a tendency to return to the neutral position (not pushed out, not pulled in), different subs have very VERY different damping factors, which means one could return to center, while the other one is flapping around waiting to return, which will result in MUDDY, musically BAD sound.

Don't do it! Pawn one of them off and get matching speakers.

That is unless you're willing to build some sort of active acoustic control system to compensate. But you're not. No one is.

thank you guys for your advices, i will go about getting another infinity sub and install them as a pair... by the way are those infinity kappas any good?