well if thats how you wired the sub if it's a D2 then your at 1ohm if it's a D4 then your at 2ohms , and as far as the meter download a test tone at 50hz turn off all filters and turn the HU up 3/4 with the sub unhooked hook up the dmm leads to the speaker outputs on the amp set the dmm to ac now with the tone playing turn up the gain until the meter reads the desired ac output(you will need to google gain settings chart) ....wait isn't there a sticky on this?good luck bro, it's really simple after a couple times you can do it at a gas station in 3-5 minutes if you had too!