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Yet another ohm load Q


Jeff R

Question

Posted

Okay, I should know this but I'm too lazy. Here's the scenario as I know it so far.

A former bandmate is giving me a Marshall 1936 series 2x12 cab I found for him in the mid 90s. Going pick it up today (all-day road trip). Don't know if it's 16 or 8 ohms yet, or if it has the 16/8 ohm switch on the back like the newer ones. Unsure of the Celestions in it, but they're likely either 70s or 75s.

My Bluesbreaker reissue is two 8 ohm Greenbacks wired for 16 ohms (parallel?). The ohm selector on the back of the amp is thus set for 16 ohms. It's the three-way rotary switch that dials 4, 8 or 16. It has two speaker jacks - one for the internals and one for an external cab.

So what's going to happen when I get this new-to-me cab home if it's non-switchable and 16 ohms? 8 ohms? Looking for the easiest hookup option.

3 answers to this question

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Posted

If the cab is 8 ohm, and wish to use it in conjunction with the internal speakers actual impedance will be 5.33 ohm. I'd set it to 4.

If the cab is 16 ohm, the total impedance will be 8 ohm.

Posted

That's pretty much what I thought. Thanks!

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