if you wire those d4 in parallel then you will be at 1ohm. Would most likely read that wire dmm was touching the wires coming off the terminals inside the box as stated above. That apsm should do great on those hifonics subs @1Wired my subs down to what I thought would be a straight 1 ohm load.
When I use my DMM to check I get 1.5.
How is this possible.