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My 2x10's sounds muddier and more undefined than my 1x15

Battery test: plug a speaker cable (1/4" connector kind) into the cabinet. On the other end of the cable, touch one pole of a 9-volt battery to the tip, the other pole of that 9-volt battery to the sleeve/shaft, and make sure both speakers in the cabinet either pop out or in together - they should both move the same direction or they are wired out of phase (opposite polarity). This would make that cabinet sound thin, undefined, and bad.

If you use multiple cabinets, carefully repeat the same test with your other cabinets: touch the same poles to the tip and sleeve (whichever way you did it with the 1st cabinet) and make sure the speaker(s) move(s) the same direction as the previous cabinet's speakers. This makes sure all of your cabinets are in phase with each other.