Cab combination questions

[BogeyBass]

Okay, thanks guys. Got the gist of it, high current equals heat equals equals bit of melting equals more current equals short circuit. The rest is study.
I was wondering what an over-current protection looks like to shut off the power section.

Well the classic age old over current protection would be the good old fuse.
Otherwise whenever there is to much current being pulled their will be a voltage drop. So you can have a circuit that monitors voltage and when it reaches a certain point, it can shutoff a relay or can use the mute function found on some chip amps to shut it down. usually a set of logic chips will be used to have warning lights come on as well

 

[Slevage]

A thermal switch on the heatsinks of the output transistors would do it.

Better yet--- a thermo couple that goes into the low voltage (micro processor?) control circuit.

 

[crz53]

Jeez, I didn't realize my little question would spawn such a discussion. I went to Guitar Center yesterday to get a cable, and I asked a guy there about it. He told me the same thing that Barryaudio said - the outputs aren't different impedances, just two outputs.

So this leads me to another question. If I get a 2x10 that is rated at 120W, and my 1x15 is rated at 200W, does that make 320W of handling power, or does each cab have to be able to handle the full 220W load on its own? Thanks for all of your help.

 

[René_Julien]

Assuming they are both 8ohm cabs it will handle 240W.
The power is divided evenly among two cabs with the same impedance.
Since the lowest powerhandling cab is 120W you can safely push about 240W, 120W to each cab.

220W will result into a maximum of 110W to each cab so that would be safe.
But I don't know you will push your cabs that far.

I would advice getting the same 1x15 cab. Matching cabs have better results theoretically (and practically but it isn't usually noticable standing next to your rig.)
Lots of people play mixed cabs and do just fine with those rigs also.

If you mix those cabs the 2x10 is going to have to work harder than the 1x15.
That's why I personally don't like mixing cabs.
And the phasing issue.
And the aestethics (subjective).

 

[barryaudio]

I'm going to go ahead and second what Rene_Julien said. I would suggest that you just add the 15" cab--I think you will be very happy (not to mention, it should save you a few bucks).