Wiring for switchable/multi input 4/16 ohm cab

[StrummersOfThunder]

Hi
Just so I end up grabbing the right parts from Jaycar can someone post a diagram of how to go about wiring a 2x12 with 8ohm speakers cabinet such that I have an input (or switch) for 4ohm or 16 ohm?
I'm guessing I'll need some sort of switching jacks to open one circuit when the other is closed.
Thanks

[GrantB]

Yep, a double throw switch (dpdt) and wired like this ignoring the out

https://www.jaycar.co.nz/dpdt-standard- ... hText=Dpdt

[StrummersOfThunder]

Yep, a double throw switch (dpdt) and wired like this ignoring the out

https://www.jaycar.co.nz/dpdt-standard- ... hText=Dpdt

awesome
i did find that image but the 'in' and 'out' confused me.
Is the out an extension speaker out? or are those the two inputs?

[Jay]

You can use either. Just remove one and call the other SPEAKER

[StrummersOfThunder]

You can use either. Just remove one and call the other SPEAKER

what do you mean remove one ?

[StrummersOfThunder]

Yep, a double throw switch (dpdt) and wired like this ignoring the out

https://www.jaycar.co.nz/dpdt-standard- ... hText=Dpdt

would something like this not be rated for that sort of heavy work? Just seems a slider might be a bit less likely to catch on stuff

https://www.jaycar.co.nz/sub-miniature- ... uEQAvD_BwE

[Jay]

You can use either. Just remove one and call the other SPEAKER

what do you mean remove one ?

Remove either the IN or OUT from the circuit and relable the remaining one speaker

[Jay]

Yep, a double throw switch (dpdt) and wired like this ignoring the out

https://www.jaycar.co.nz/dpdt-standard- ... hText=Dpdt

would something like this not be rated for that sort of heavy work? Just seems a slider might be a bit less likely to catch on stuff

https://www.jaycar.co.nz/sub-miniature- ... uEQAvD_BwE

Won't handle the currents

[StrummersOfThunder]

You can use either. Just remove one and call the other SPEAKER

what do you mean remove one ?

Remove either the IN or OUT from the circuit and relable the remaining one speaker

But I could choose to leave it in and it would be an extension speaker out ?

[StrummersOfThunder]

Yep, a double throw switch (dpdt) and wired like this ignoring the out

https://www.jaycar.co.nz/dpdt-standard- ... hText=Dpdt

Do you see a less obtrusive switch that Jaycar offers ?


would something like this not be rated for that sort of heavy work? Just seems a slider might be a bit less likely to catch on stuff

https://www.jaycar.co.nz/sub-miniature- ... uEQAvD_BwE

Won't handle the currents

[Jay]

what do you mean remove one ?

Remove either the IN or OUT from the circuit and relable the remaining one speaker

But I could choose to leave it in and it would be an extension speaker out ?

Correct, but you would have to 'recalculate' impedance as the external connection is wired in parallel.
Examples
DPDT set to 16 ohm. Add 16 ohm external speaker. New impedance is 8ohm.
DPDT set to 4 ohm. Add 16 ohm external speaker. New impedance about 3 ohm. (64÷20)

[StrummersOfThunder]

Remove either the IN or OUT from the circuit and relable the remaining one speaker

But I could choose to leave it in and it would be an extension speaker out ?

Correct, but you would have to 'recalculate' impedance as the external connection is wired in parallel.
Examples
DPDT set to 16 ohm. Add 16 ohm external speaker. New impedance is 8ohm.
DPDT set to 4 ohm. Add 16 ohm external speaker. New impedance about 3 ohm. (64÷20)

Gotcha. I'll leave it out.
Or.... Could you have it to access one speaker at 8ohm?

[Jay]

But I could choose to leave it in and it would be an extension speaker out ?

Correct, but you would have to 'recalculate' impedance as the external connection is wired in parallel.
Examples
DPDT set to 16 ohm. Add 16 ohm external speaker. New impedance is 8ohm.
DPDT set to 4 ohm. Add 16 ohm external speaker. New impedance about 3 ohm. (64÷20)

Gotcha. I'll leave it out.
Or.... Could you have it to access one speaker at 8ohm?

No, for that see thread below. I ll see if I can dig that photo up

https://www.nzguitars.com/forum/viewtop ... ch#p728368

[StrummersOfThunder]

This all worked out just great. Thanks