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Can You Run 2 Different Amps For Subs? Can You Mix 12's & 10's?

Old 03-26-2008, 06:52 PM
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Cool Can You Run 2 Different Amps For Subs? Can You Mix 12's & 10's?

I have a Kenwood KAC-9102D that runs at 500 watts RMS x 1 at 4 ohms (850 watts x 1 at 2 ohms)

I'd like to add a second ... can this be done?

Or even better, can I purchase an even powerful amp, D Class for the subwoofers and run both at the same time?

I'm debating whether or not to run 2 more subwoofers (4 total) or purchase a better amp and leave the 2 I have ...

Kicker CVR 12's (400RMS)


Other related question,
Can I mix Kicker CVR 12's and 10's in the same setup? Why? Because I own 12's already installed and have 10's I just happen to purchase at the same time but never used ... wondering if I should just drop them in ...

ANY advice is GREATLY appreciated
Seriously ... thank you
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Old 03-26-2008, 07:12 PM
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i would not use them!
if you do get an EQ and an 2n amp ,set 2nd amp to play a higher hz then the 12 play . so the 12 plays 30hz to 80hz and the 10 plays 80hz to 150hz
sell the 10s off
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Old 03-27-2008, 09:15 AM
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So the 12's and 10's can be run at the same time, though you would have to set that up properly ...

I've always read against not running different amps in the same setup, so I won't do it, but I thought I'd ask.
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Old 07-24-2008, 06:58 PM
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Alright ... forget the idea about running 12's and 10's together.

I have the one sub box (2ohm) with 2 12" subs in it ...
I'm wondering if there's a way I can run 2 identical amps to it.

What would I need to do this?

Thanks for any advice or places to educate myself
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Old 07-25-2008, 08:58 AM
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Honestly If I were you I would go with one single bigger, better amp. if you want more SPL there is only a couple of ways to do it, from the theory I have heard from way back (I may have heard wrong but please correct me if I am). Double the power or double the cone size +3DB? Am I wrong in what I heard, or am I just out to lunch. Mind you when I heard this it was from an installer, in like 1998 lol! And then I was a newb, nowadays I do my homework before I built a system. But my sugguestion would be to put more power to those puppies, they can handle 400 RMS so you can get yourself a good 2ohm ohm mono stable amp that puts out the power you need, and your good to go!
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Old 07-25-2008, 09:54 AM
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Infin1ty, in theory you're right there. They say that doubling cone surface or power at most levels when reproducing bass will give you +3 db.

As far as using two amps for one box, if the drivers aren't separated in any way, it's definitely safer to go with a single amplifier. If you're going to use multiple amplifiers with the same box, firstly you still have to use identical drivers. Secondly, you have to use the same settings on both amps. If either of the drivers goes out of synch, you run a high risk of having them damaged, especially if it's in a sealed environment. They act together and when one comes in, the other pushes out. Definitely not the ideal setting.

Now as far as mixing 12s and 10s goes, for SPL purposes it's not a great idea unless both of them have the same frequency characteristics. (ie: Fusion PPSW and NV series have 10s, 12s and 15s that have the same resonant frequency due to them changing the cone thickness to keep the weight consistent) This stuff should be in your woofer's manual that shows specs and test data. Now, depending on what kind of box you have set up and whether or not you have an active LPF and HPF will determine if this can be set up properly. If your amps have high pass crossovers, then you're set. Find out what the slope of the crossover is (usually 12db slope) and set your high and low pass filters accordingly. Don't set one at 20-80 and the other from 80-120 or something similar, because at and just around the 80 point you're going to have a decibel jump because of the frequencies overlapping. You need to seperate them depending on the slope of the crossovers. If it's a 24db crossover slope, you have to set a bit closer than a 12db slope. I don't have any exact examples on hand however.

Hope it helps
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Old 07-25-2008, 07:40 PM
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I'm only asking about the 2 amp scenario because I already have the 2 identical amps, so rather than letting it sit in the box in my bedroom (like it is now) I thought maybe I could put it to some use.

I see what you're saying though. Guess it's going to sit. I can't afford to disassemble and create a new box, allowing me to seperate the 2 subs ... realistically that's not going to happen right now.
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Old 07-25-2008, 07:43 PM
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For a situation like that with both of them in one box it's really your best bet, it has the lowest risk of something getting damaged.
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Old 07-25-2008, 07:50 PM
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I'm only happy with my system for so long, so I'm forever changing and upgrading ... that's how I've got into this boat.
And with this thread it almost feels like it's time for another overhaul.

I won't ... but I want to oh so bad.
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