You are at 10 watts OR 4.5 volts, not both. If you are at 10 watts with 1.8ohms resistance, the mvp will automatically regulate itself to 4.24 volts. If you are at 4.5 volts with 1.8 ohms resistance, the mvp will automatically regulate itself to 11 watts (should be 11.25 but the mvp can't go...