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Another Ohm Question..Sorry lol.

If your 1x15 is an 8 ohm, then if you add another 8 ohm cab, the total will be 4 ohms, probably the minimum ohms that your amp can handle, providing that the cabs are ran in series.

Good advice but you got the series parallel thing backwards. Parallel is the standard way of wiring using standard cables. Total resistance adds as 1/8 + 1/8 = 1/4 in parallel.

Series operation would require custom cabling and would lead to a total load of 16 ohms with two 8 ohm cabs.

This should all be clearly explained in the ohms stickies.