Electric Guitars/Guitar Amps


Dr. Moore,

I work with a country trio here in Florida.
The lead player is an old (67) school country picker.
He also plays steel guitar.
He has several amps--both Fender and Peavey.
He wants to hook up an extension speaker to his amp.
I have been trying to help him out (I know about OHMs and series and parallel circuits)--
His favorite amp is a Fender and is rated at 4 ohms.
The speaker that he wants to use is also 4 ohms.
I know that hooking up two 4 ohm cabinets will result in a 2 ohm load, and that is not a good thing.
If I change the wiring, I'll end up with an 8 ohm load, but I was told that I should NOT do this.

Is there any type of device that you can plug into, that changes the impedance of  speaker cabinets?

Is there any way to hook up an extension speaker for a guitar, besides starting with two-8 ohm cabinets to produce a 4 ohm load?

Thank you.

Thanks for asking that Mike. You want to bring a 4 ohm rated unit to the resistance of the an 8 ohm rating. I would put a resistor of the proper value inline. Resistors like you need are common and any electronic store can fix you up. I hope I under stood your plan, I have done this in the lab and on my stereo.  Tell me if this is a fix for you, I think it is.

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DR Kevin P Moore


Guitars and cats make life so much better. Playing the guitar is a wonderful thing, fixing you guitar is not that hard. I have played since I was a kid and started to fix guitars and the other things that needed repair. I still repair guitars for friends and myself and do enjoy it. I rebuild old guitars to their former condition, all amps and music gear. That the mystery out of where and when a guitar was made. The value of it and the difference between junk and a guitar you can grow old with. Ask me things and have some fun.


The fascination with electric guitars is the top for me. I fix amps, wiring and put the things that fall off back on. The way to really set a guitar up and make it a player. Buying a guitar is an art, and good amps that will get out that tone we all look for, Zen guitar and amplifier is a way to approach it. Better is no worry ask an expert.

Library of congress, five patients. I write on several guitar forums and many essays on guitar health.

PhD, MS, BA and a BS all from CMU. I have a BA from Mercyhurst College.

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