Some opinions for a small setup that I am working on. I have a Peavey microbass that I love and want to expand it just slightly. I have in my possession a 12 scorpion bass speaker and a new cabinet to put it in. I also read on a forum, that a microbass user replaced his speaker with a pyramid 8 woofer and got a great increase in sound quality. Now here is the issue. Plugging in the external speaker disables the built in speaker. Both speakers are 8 ohms. If I read correctly, (2) 8 ohm speakers can be wired for 4 ohms giving me a greater output from the amp. If theoretically I am correct then how do I set up the wiring that the external output does not disable the internal and also by using the external speaker, I get a total of 4 ohms. At the same time I believe that not using the external would revert me to the factory setup of 8 ohms. I hope that this is clear and any input would be appreciated from this midlife newbie. I presently have a Carvin L75M 5 string and also looking for an acoustic electric.