hi, im looking at adding a 2x10 to my 100 watt combo, would this work or would it fry the amp?
thanks.

I hook my 2x10 cab to my 1x15 400 watt combo. I think it would be possible to do with the 100 watt, but I don't know if it would make much of a difference compared to just playing the combo as is. I don't think your amp is designed to actually have a cab, often it says what kind of external speakers or cabs it can handle.
What kind of amp is it?
You might be better off getting a new amp .... I don't know really... sorry

__________________

yeah it has two external speaker outputs that are 120 watts at 4ohms and 100 watss at 8ohms

Well what's the resistance of your cab?

Seeing as it is a 2x10, it is probably 4 ohms. If this is true, then you can do it, just make sure to put it in the 120 watt outlet. I'm not too sure but I think the only time you can fry something is if you use something that is below the specified resistance (for ex if you plugged the cab in the output that sais ''min 8 ohms'').

I really wish I knew a website that could explain the physics of amplifiers for me .... I'd like to understand why this happens ....
I think if the resistance (ohmage) is too low for a given voltage, the the intensity is too high, but I don't understand what watts mean ....

__________________

The cab is a Hartke 210T 2x10, cant afford anything better. It's Power Handling is 150 Watts at 8 Ohms. Or there is also another input on the back that says ballanced line out, which has a volume knob next to it.