I just got a free Fender cabinet that only has one speaker, but looking at the back it has two separate inputs. They're labeled as 8ohm parallel, but I thought you needed at least two speakers to wire a cabinet in parallel.

Does this mean I can just use either one of the inputs and it will be 8ohms?

  • It's a throughput socket, wired in parallel. Wiring one will give 8 ohms, wiring 2 will give 4 ohms.
    – Tetsujin
    Aug 5, 2017 at 17:34
  • @Tetsujin, so if I only plug my amp into one input it's 8 ohms, but if I were to plug two amps into it, it would be 4 ohms for each?
    – tjwrona
    Aug 5, 2017 at 17:37
  • no no no... one amp only. Potentially 2 identical speakers... though as you only have one, the point is moot.
    – Tetsujin
    Aug 5, 2017 at 17:38
  • @Tetsujin, I'm still somewhat confused. Why have two inputs for the one speaker if you're never supposed to use both? The cab was clearly built to have only the one speaker.
    – tjwrona
    Aug 5, 2017 at 17:50
  • 1
    You don't want to plug two amps into any speaker!! it's a strange one, but is probably an orphan, its twin got lost somewhere.
    – Tim
    Aug 5, 2017 at 18:03

2 Answers 2


It's almost certainly a Through connection, wired in parallel with the other socket. Yes, you can use either socket as input. If you connect through to a second, similar speaker, the amplifier will be seeing 4 ohms. This won't worry a modern amplifier, though it might an older valve amp.


Best solution - open up the cab., see how the jacks are wired - series, parallel, put a multimeter across the speaker to see if it is indeed 8ohms. Then you have the options.

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