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An EPX is not upgradable. It came with a 14band EQ. The EPX2 came without any EQ card and has the option of a 14band or a 28band expansion card being added internally.
the SYM-XOM is for the original Symmetry. It fits neither EPX or EPX2. Both the EPX and EPX2 have a 10channel crossover integral to them. It is not upgradeable.