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With 1/4” to XLR...13.8 and with a standard 1/4 to 1/4 I’m getting 7.7. The XLR is pin 2 hot and pin 1 ground and nothing on pin 3. I’m using left XLR into cab or top 1/4”
I think your getting a bad/false reading on the XLR but the reading on the 1/4 looks good.
You have an 8 ohm cab.
A 4 ohm cab would read around 3 ohms IIRC.