Running two subs through mono amp

Is it possible to run two subs in two different boxes through a mono amplifier? If so, can anyone please give me some advice on how to do so. I currently have a 10" Dual voice coiled 4 ohm Kenwood Peak- 600w; RMS- 300
What specs should the second subwoofer have?
Thanks for the help in advance

I would strongly suggest you get the same sub. Mismatching subwoofers is something most of the people on this board would not recommend.

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There is no such thing as free installation!

Yes it is possible and done all the time. The main thing is to get the impodence right at the amp.

What amp are you using now?

I'll post a pic of how to connect it once I get the rest of the info from you.

As for a suggested sub, I agree with tcss. I'll post a pic of how to do it in a minute as well as what specs the amp should be.

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
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If you get the same make/model sub, then you have several options:

1) Wire them in Parallel for a 1ohm load. You would need an amp that is 1ohm stable and rated 600x1@1ohms. That way each sub would receive 300watts RMS. Here's how it would look:


2) The other way to wire them is in Series/Parallel for a 4ohm load. You would need an amp rated 600x1@4ohms. Each sub would still receive 300 watts. Here's how it would look:


What you probably have wired now is (1) 4ohm DVC wired in Parallel presenting a 2ohm load to the amp like this:


A 3rd option would be to to buy 2 new subs, only this time get 2ohm DVC's instead of 4ohm DVC's. That way you can run them in Series/Parallel and present a 2ohm load. You would need an amp rated 600x1@2ohms. Each sub would still receive 300 watts. Here's how it would look:


*Images courtesy of Rockford Fosgate*

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
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i have a Blue thunder MTX mono channelled amplifier, not sure about the specs on it because i bought it used.. i think it has the number 80 on the top... any insight?

and what are the options for not getting the same sub.. because I wont be doing that.. thanks

Impedance and power capabilities are just the start.  You'll also need to match sensitivity and SPL characteristics of the enclosure/sub system.  And this is just the system design side, let alone how they will be installed, or if they both sound the same.  You're much better off matching the subs.

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Agreed, unmatched subs are a pain in the ***. It's easy to post the schematics for the ohm levels, but a LOT more difficult to predict the sound quality you will receive when you use multiple brand/model subs.

As for the amp, unfortunately I can't give any spoecifics as to what you should do without having the model number to research.

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
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Ok give me a minute and I'll see what I can come up with.

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
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Ok first off here's your specs:

Kenwood KFC-W2505 (10”)
4ohm SVC
150RMS 600Peak

Kenwood KFC-W2503 (10")
4ohm SVC
130RMS 500Peak

MTX Blue Thunder PRO50X2
25x2@4ohms
50x2@2ohms
100x1@40hms

Now for the bad news.
That amp is not listed as a class-d mono amp. It's a 2-channel amp. That came directly from MTX for the model number you gave.
MTX Blue Thunder PRO50X2

According to Kenwood, The KFC-W2505 is an SVC (Single Voice Coil).
Kenwood KFC-W2505
I couldn't find the manual for the KFC-W2503, Kenwood doesn't have it listed online. But from what I was able to find on different sites the specs above should be correct.

I take it right now you have the KFC-2505 bridged to the amp like this:


If you add the second sub using that amp you will not be able to bridge them (it would be a 2ohm bridged load and your amp is not stable at that rating). You would need to run each sub to it's own channel for the 25x2@4ohm rating. You will not like the way it sounds with only 25watts per speaker.


If you want to run both subs, then I would strongly recommend getting a different amp. One suggestion would be to look for one rated 300x1@2ohms or 400x1@2ohms.

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com

Hey thanks for the advice man. Saves me a bit of money!
But I really want two subs, I dont know where you are from but here we have XS Cargo, wholesale store kind of, and they are currently selling this 10" sub with a small amp.
I would like to take that sub put that up front and then put the kenwood back in the trunk with the original box.
Would this thing work, it should because its running on its own amp.
The Sub...

Unfortunately they don't list the specs for that amp and sub. Without that info all I can say is you could use both amps, run (1) sub to (1) amp and the other sub to the other amp.

I'd have to see the actual specs for that Visonik amp to say for certain what your power rating would be if you hooked both up to it, but I'm going to take a guess and say 300x1@2ohms (each sub would get apx 150 watts). Every mono-block class-D amp I've seen has been at least 2ohm stable, so you could safely wire it like this:


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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com

There is also a woofer wiring diagram link on the left side of this page. You can plug in how many woofs and what impedence and it will show you the different configurations.

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The Flakman
I feel strange. I have deja vu and amnesia at the same time.

John | Manteca, CA

So I could wire up the two amps and subs seperately no problem, remember i dont need a lot of power for the upfront subwoofer(visonik)

Yes you could, that's one fo the things I said in my last post.

If you do that then you might want to look at which amp would be better suited for which sub. Otherwise you'l end up with too much bass up front and not enough in the rear.

You may be better off using the Visonik amp for the rear Kenwood if it has a higher wattage output at 4ohms.

Good luck

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
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I just checked out the back of my deck where the current amp is plugged into the RCA outputs (i believed they are called; where the amp is plugged in) and there is no more outputs for another amp to be plugged into the deck. Im wondering how I can get around this problem because I know that it is possible to hook up 2 amps and 2 subs. Thanks for the help.

It's called an RCA Y-adapter. You would need 2 of them and another RCA cable.

But you shouldn't need them. Keep both right and left adapters connected at the headunit. Now instead of running both ends back to the right and left inputs of 1 amp, run 1 to the left input of one amp, and the other to the left input of the other amp. Since both amps are going to be running mono anyways (1 mono and the other bridged-mono) you wont need a "stereo" input. And the left input channel on most amps is the mono input.

Before you ask, yes you will still get sound from all the speakers.

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
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or you can use the rca outputs from one amp and connect it to the second amp. Im pretty sure all MTX amps are capable of this.

Ok I bought the sub and amp, the Visonik.
It will be installed on sunday so I'll post again then or earlier with any problems. I cannot thank you guys enough, especially squirrel thanks.

No problem, glad to help

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Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com