different ohm loads on the same amp

Would it be safe to wire a svc 4ohm sub on one channel of the amp and a set of svc 4 ohm subs on the other channel of a two channel amp that is 2 ohm stable. I have to 10's and one 12 and I don't want to run all the subs off of one bridged channel. So my thought was to run the 10's in parallel on one channel yielding a 2 ohm load and the 12 wired normal to the other channel yielding a 4 ohm load, but I wasn't sure how the amp would handle this configuration.

Will it work?  Sure.  Will it sound good?  Probably not.  The single sub will receive twice the power that each of the dual subs receives and will be dominate the sound and depending on many factors too numerous to list right now you could end up with less total output due to cancellations.  Plus, a 2-ohm load on each channel is the same net result as a 4-ohm load bridged, so you do not gain any advantage in terms of amplifier loading.  If I were you I'd dump the 10's and use the 12 by itself with a proper subwoofer amp not a stereo amp.

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If you run them all bridged, in parallel, you will net a 2 ohm load. This will be ideal for powering all the subs, but remember, they will be powered equally. If you are set on going with two separate channels, your best bet would be to run the 12" on one channel at 4 ohms, then the two tens in series at 4 ohms.

   4 + 4 + 4 = 1.33    Do NOT bridge your amp on all your speakers.

i am an idiot wrote:

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   4 + 4 + 4 = 1.33    Do NOT bridge your amp on all your speakers.

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Sorry but your addition skills are off

4 + 4 + 4 = 12

I think you meant parallel which would be this

(1/4) + (1/4) + (1/4) = .75^(-1) = 1.33

And he CAN bridge his amp to all of this speakers but they will still sound like crap

Please read his initial post his amp is 2 ohm stable that is 2 ohms per channel. Someone else told him it was OK to parallel all his woofers and bridge them on the amp. If he parallels all his woofers and runs a 4 ohm mono amp at 1.33 ohms he is going to have problems.

"run the 10's in parallel on one channel yielding a 2 ohm" - if two subs are run in parallel at two ohms, each sub would be 2 ohms. Your math is off.

all in parallel would look like this: 4x2x2/4+2+2= 2

He also said his amp is 2 ohm stable bridged.

My math is off?   3    4ohm speakers = 2ohms

Is it just me?

And also did anyone else see where he said his amp was 2 ohm stable BRIDGED?

Three 4 ohm speakers wired parallel = 1.33 ohms. Three 4 ohm speakers wired in series = 12 ohms. If either of you would state how you are wiring them, there would be no confusion.

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Sorry, I mis-read the part about the amps stability. Each channel is 2, not 2 bridged. Not that it is relevant now, but he doesn't have 3-4ohm speakers, he has 1-4ohm, and 2-2ohm sub woofers, creating a 2ohm load when they are all run parallel. If you read the part about the 10's, it said his two 10's run parallel yield 2ohms, making each one 2ohms. Sorry, I'm not trying to sound like an ass and second guess you, I just wanted to clear it up.

he has three single coil 4 ohm woofers...size doesn't matter

my math for parallel wiring is right.

I don't know where you got 2 ohms from three 4 ohm speakers

I meant his amp CAN be bridged...not with the woofers wired in parallel but series (12 ohm) or two in parallel and then series with the third for a 6 ohm net load

some ?'s what amp spec's ? subs ?.

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1974 ford pinto 4 15" punch Z power punch bd 1001 pioneer DEH-6700

Okay, sorry about the misinformation! My amp is 2 ohm stable stereo, 4 ohm stable mono. I have 1-4 ohm 12"svc sub and 2-4 ohm 10" svc subs. All I really needed to know if amps were capable of multi ohm loads. Meaning if I ran the two 10" subs in parallel to one channel, it would have a 2 ohm load (right?, two 4 ohm subs in parallel equal 2 ohms). I was then going to just run the 12" off of the other channel, that would give it a 4 ohm load. So, 2 ohms on one channel, and 4 ohms on the other channel. I've never tried it b4 and I was just curious about it, I know there are many other options that I could do. My amp is an older Kenwood (Kac-929, I think)

Yes it will work.  No it is not a great idea.

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Thanks, and sorry for all the confusion