Switching jack for speaker cab

[Dan German]

OK, my brain no work today. I want to use a small combo as a speaker cab. Is there a simple way to install a 1/4” jack in a combo (on the back) so that when I plug in a speaker cable from the head, it disconnects the speaker from the amp in the combo? Shirley, there must be…

 

[schmee]

Not in the amp chassis right? On a plate etc?
I think maybe this? This uses the internal speaker with the combo amp until you plug into the jack with your head output:
Turn the combo amp OFF!

 

[24 track]

Dan this may help you it is the wiring for a marshall1922 cab, 2X12 allowing you to use each driver individually , you could modify the design to fit your needs , it does require a special switch craft switch but rather than the hard wiring it would work for your purposes , option 2 would be to install a switchcraft cut off jack , so that when you plug into the back of the cab it cuts off the + circuit to speaker and reroutes the circuit from the new jack to the speaker , just a thought

the jack on the right is the one you will need

 

[Peegoo]

@Dan German

Note: this can be a liability because when you have a different amp plugged into the combo speaker, there's no load on the *combo* amp. You don't want to switch that one on unless you first pull the plug from the jack.

Here's the way to do it.

 

[24 track]

@Dan German

Note: this can be a liability because when you have a different amp plugged into the combo speaker, there's no load on the *combo* amp. You don't want to switch that one on unless you first pull the plug from the jack.

Here's the way to do it.

great point!

 

[Dan German]

Not in the amp chassis right? On a plate etc?
I think maybe this? This uses the internal speaker with the combo amp until you plug into the jack with your head output:
Turn the combo amp OFF!

Yes, just mounted on the back so that I can connect a head without disconnecting the speaker each time. And yes, I will have to turn the amp off to do so. I expect I will only rarely use the amp, I just don’t want to rip it out of the cab when it can serve as an emergency spare amp.

@Dan German

Note: this can be a liability because when you have a different amp plugged into the combo speaker, there's no load on the *combo* amp. You don't want to switch that one on unless you first pull the plug from the jack.

Here's the way to do it.

That is the kind of jack I was thinking of, thanks for the pic of connections.