Hi bass friends. I have a GK MB150 and a GK 200MB. Both are nearly identical combo amps. I would like to use the 150 as an extension cabinet for the 200. My question is: Can I plug a speaker cable from the 200 into the speaker OUTPUT of the 150 without damaging the circuitry of the 150? By doing that, the 200's speaker output would be sent directly to the 150's speaker. The 150 would of course be off and unplugged from AC. I don't want to modify the 150 by adding a speaker jack so I'm wondering if my bizarre plan will work?