Hello! I have one 2x12" cab, that is measuring 6.8 ohms in the 8 ohm input, is this acceptable? I measuread one 16ohm celestion vintage 30 and the multimeter measures 13 ohms.

All good. The nominal impedances like 8 or 16 occur at frequencies around 400-500hz. At dc levels as measured by a meter, those lower values are very typical and normal

Yes that's about what all 8 ohm speakers/cabs measure Now if it measured actual-8-ohms, I'd be shocked. They never do. It's always ~7 for "8 ohm", 13-14 ohm for 15/"16ohm" labelled speakers

Speaker ohms are rated at their Nominal Impedance (AC). But with a multimeter you are reading DC Resistance. If you look at the specs for a V30 on the Celestion Website, DC Resistance is quoted at 7.3Ω (8Ω) or 12.9Ω (16Ω). https://celestion.com/product/1/vintage_30/ https://mesaboogie.zendesk.com/hc/e...ted-impedance-not-match-an-ohm-meter-reading-