Zwikman

hello i have a 1981 jcm 800 2204 and im going to have a 2X12 cab with
Celestion G12M-25 Greenback 12" Speakers should i get the 8 ohmn or the 16?

and the 25W speakers should match the 50W head right?

Marshall Amps

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coldsteal2

either one would be fine

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jtm-series player

you could wire 2 16Ω speakers to an overall impedance of 8Ω,
as well as 2 8Ω speakers to 16Ω OR 4Ω, but I would not recommend
that, because you can't use 2 4Ω cabs at once.

2 25w speakers should be fine.

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mmorse

One thing to consider. The average Marshall 50 watt head will put out 65-80 watts when dimed. Marshall rates their amps on clean power. In other words, the amp will put out 50 watts prior to clipping (distortion). If you run the master way up, you will eventually fry a pair of Greenbacks. To be safe, you would need to run a quad of greenies.

nowhereman579

Can you mix "greenies" with 60w or 75w speakers ? Or theyr're going to be totally covered by the 60w/70w ?

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mmorse

It's not the wattage so much as the speaker's efficiency. I believe Greenies are around 97db. So if the other speakers are about the same, you should be alright.