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Wiring for switchable/multi input 4/16 ohm cab
Posted: Sat Jul 15, 2023 11:11 am
by 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
Re: Wiring for switchable/multi input 4/16 ohm cab
Posted: Sat Jul 15, 2023 12:18 pm
by GrantB
Yep, a double throw switch (dpdt) and wired like this ignoring the out
https://www.jaycar.co.nz/dpdt-standard- ... hText=Dpdt
Re: Wiring for switchable/multi input 4/16 ohm cab
Posted: Sat Jul 15, 2023 12:48 pm
by StrummersOfThunder
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?
Re: Wiring for switchable/multi input 4/16 ohm cab
Posted: Sat Jul 15, 2023 12:56 pm
by Jay
You can use either. Just remove one and call the other SPEAKER
Re: Wiring for switchable/multi input 4/16 ohm cab
Posted: Sat Jul 15, 2023 1:06 pm
by StrummersOfThunder
Jay wrote: ↑Sat Jul 15, 2023 12:56 pm
You can use either. Just remove one and call the other SPEAKER
what do you mean remove one ?
Re: Wiring for switchable/multi input 4/16 ohm cab
Posted: Sat Jul 15, 2023 1:12 pm
by StrummersOfThunder
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
Re: Wiring for switchable/multi input 4/16 ohm cab
Posted: Sat Jul 15, 2023 1:36 pm
by Jay
StrummersOfThunder wrote: ↑Sat Jul 15, 2023 1:06 pm
Jay wrote: ↑Sat Jul 15, 2023 12:56 pm
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
Re: Wiring for switchable/multi input 4/16 ohm cab
Posted: Sat Jul 15, 2023 1:36 pm
by Jay
Won't handle the currents
Re: Wiring for switchable/multi input 4/16 ohm cab
Posted: Sat Jul 15, 2023 1:39 pm
by StrummersOfThunder
Jay wrote: ↑Sat Jul 15, 2023 1:36 pm
StrummersOfThunder wrote: ↑Sat Jul 15, 2023 1:06 pm
Jay wrote: ↑Sat Jul 15, 2023 12:56 pm
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 ?
Re: Wiring for switchable/multi input 4/16 ohm cab
Posted: Sat Jul 15, 2023 1:39 pm
by StrummersOfThunder
Jay wrote: ↑Sat Jul 15, 2023 1:36 pm
Won't handle the currents
Re: Wiring for switchable/multi input 4/16 ohm cab
Posted: Sat Jul 15, 2023 2:08 pm
by Jay
StrummersOfThunder wrote: ↑Sat Jul 15, 2023 1:39 pm
Jay wrote: ↑Sat Jul 15, 2023 1:36 pm
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)
Re: Wiring for switchable/multi input 4/16 ohm cab
Posted: Sat Jul 15, 2023 2:15 pm
by StrummersOfThunder
Jay wrote: ↑Sat Jul 15, 2023 2:08 pm
StrummersOfThunder wrote: ↑Sat Jul 15, 2023 1:39 pm
Jay wrote: ↑Sat Jul 15, 2023 1:36 pm
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?
Re: Wiring for switchable/multi input 4/16 ohm cab
Posted: Sat Jul 15, 2023 2:27 pm
by Jay
StrummersOfThunder wrote: ↑Sat Jul 15, 2023 2:15 pm
Jay wrote: ↑Sat Jul 15, 2023 2:08 pm
StrummersOfThunder wrote: ↑Sat Jul 15, 2023 1:39 pm
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
Re: Wiring for switchable/multi input 4/16 ohm cab
Posted: Sat Jul 15, 2023 7:29 pm
by StrummersOfThunder
This all worked out just great. Thanks