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Post subject: GE-412 Cab connection
Posted: Tue Nov 23, 2010 1:30 pm
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Hello, I was wondering if anyone could tell me if I can connect the Fender GE-412 cab to a Randall RG200G3PLUS combo amp. I don't know much about impedance or any of that stuff. I couldn't find any info for the GE-412 and the Randall info is pretty vague, so I have no idea what to do.

I'm in a wheelchair and I have to sit about 20 feet away from the drummer or I wouldn't even need to use an external cab. He has trouble hearing my amp, so I need to put the cab closer to him and still be able to reach my amp controls.

The GE-412 says it is 300W at 8 ohms parallel. The inputs on the cab aren't labelled input or output and there isn't a mono/stereo switch.

The Randall says it runs 200W @ 8ohms and 240W @4 ohms. It has two external speaker outputs, the first is 4 ohms, and the second is 8 ohms. The Randall's info says the 4 ohm external speaker jack will defeat the internal speakers, but it doesn't say if it does the same with the 8 ohm side.

I would like to run the amp at 240W, so I don't have to struggle to hear it as well. So would I be able to connect the cab and run it at 4 ohms? A friend of mine suggested that I run both of the outputs from the Randall to each side of the cab, but that doesn't seem right to me. If I did that, would both external outputs of the Randall run at 4 ohms? I also don't know if the inputs on the cab are both inputs or in/out.

I'm really confused, so if anyone can help me, I'd REALLY appreciate it.


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Posted: Tue Nov 23, 2010 3:52 pm
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Hi cripple9,

Your cab should be 8 ohms, using either one of the cab jacks. Since the cab jacks are connected internally in parallel, you can use either jack for an input, and the other one would be an output, doesn't matter which is which. Don't connect both cab jacks to an amp, use one cab jack for in from amp and one cab jack for out to another speaker cab. Or use only only one jack for an in from amp and no out. Keep in mind that if you use the out from one speaker cab to another speaker cab, the ohms will change with two cabinets or more connected together. So, if you use just this one cabinet with your amp, use the 8 ohm out on your amp to just one of the jacks on the cab, either one. If you want to use two 8 ohm cabinets, connect the 4 ohm output of the amp to one of the cab jacks, and connect the other cab jack on the same cab, to another cab jack. Always use speaker cable for these connections, NOT instrument cable. I don't know if using the 8 ohm out on the amp will disable it's internal speaker or not. If the internal speaker is 8 ohm, it may stay on while using the 8 ohm output, try it and see. Let us know how it works out for you. :)

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Posted: Tue Nov 23, 2010 4:26 pm
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Thanks, that helps a little. Please forgive me if I'm being too curious here, but I'd really like to understand how all this works. I find all this pretty interesting.

I have another cab (Peavey Classic 410e). it has a switch for mono @16 ohm/stereo @8 ohm. If I understand you correctly, then is it possible to daisy chain the GE-412 into one half of the Peavey 410e at 4 ohms? I believe the stereo mode splits the speakers into two separate 8 ohm pairs, right?

That also gives me another question I've never thought of before. Can you chain cabs with two different ohms, say the 8 ohm GE-412 into the Peavey @ 16 ohms mono? What would the ohms convert to in that situation?


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Posted: Tue Nov 23, 2010 7:18 pm
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No problem, it is important to know. Whenever two 8 ohm speakers or cabinets are connected in parallel the impedance will be half, 4 ohms. So, you are right, your Fender 8 ohm cabinet connected to half of your Peavey cabinet at 8 ohms, will give 4 ohms total, and should be used with the 4 ohm output of your amp.

As far as using different ohm cabinets, the combination will give some "in between" ohms, and it will be hard to match the impedance of the amp output. A 16 ohm speaker in parallel with an 8 ohm speaker will give about 5.3 ohms, which would be OK for the 4 ohm amp output, but not the 8 ohm output, but still a mismatch. To figure the impedance of two or more speakers in parallel is; 1/(1/r1 + 1/r2 + 1/r3...) where r is the impedance of each speaker.

Generally speaking, it is OK to use a higher impedance speaker with a lower impedance amp, (8 ohm speaker with 4 ohm amp is OK), but not OK to use a lower impedance speaker with a higher impedance amp, (4 ohm speaker with 8 ohm amp not OK). :)

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---> "The amp should be SWITCHED OFF AND UNPLUGGED before you do this!" <---

Por favor, disculpe mi español, no se llega a la práctica con mucha frecuencia.


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Posted: Tue Nov 23, 2010 9:30 pm
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Wow, thanks! I do believe I understand. Seriously, I can't thank you enough.


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Post subject: GE-412 Cab connection
Posted: Tue Nov 23, 2010 9:58 pm
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Cool! If is isn't too much trouble, let us know about your sound with the different combinations of speakers, and which you decide to use.....so many possibilities. I am curious about whether the amp switches off the internal speaker when using the 8 ohm output, as you said it does for the 4 ohm output. 8)

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Por favor, disculpe mi español, no se llega a la práctica con mucha frecuencia.


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Posted: Tue Nov 23, 2010 10:11 pm
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Will do shimmilou. Probably won't be til Saturday or Sunday though. I have some stuff to do for the next couple days, but I'll let you know as soon as I can.

Thanks again.


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Post subject: Re: GE-412 Cab connection
Posted: Tue Sep 20, 2011 3:36 pm
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Did those GE-412 cabs have Celestion Vintage 30s?


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