Not sure I agree with Larryi.
The output transformer in a tube amp reflects the load impedance back to the the tubes. If you use speakers rated at a higher impedance than the output transformer impedance things will be ok. You will just get lower output.
If the speaker impedance is lower than the output transformer impedance then the tubes will draw more current than if the impedances were matched.
Whether or not this is a problem depends on the amp's design limits. Consequences range from none to damage such as blown output transformer, blown tubes, or worse, depending on amp and the amount of the impedance mismatch.
Check with your amp manufacturer for advice.
The output transformer in a tube amp reflects the load impedance back to the the tubes. If you use speakers rated at a higher impedance than the output transformer impedance things will be ok. You will just get lower output.
If the speaker impedance is lower than the output transformer impedance then the tubes will draw more current than if the impedances were matched.
Whether or not this is a problem depends on the amp's design limits. Consequences range from none to damage such as blown output transformer, blown tubes, or worse, depending on amp and the amount of the impedance mismatch.
Check with your amp manufacturer for advice.