Here's a strange one! Out guitarist has a small-mid sized PA. He usually runs 2 monitor wedges (4 ohms total) from one side of his power amp. The other side does nothing. We're experimenting with 4 wedges, the plan being to run the power amp in parallel so that both sides see the same input signal. He tried it at home and claims that in parallel mode, the power amp halves the strength of the input signal. That doesn't sound right to me, but he swears the input to the poweramp gets halved. Is this normal. The amp is an old EV P3000.