I keep forgetting this is a 5 ch. 4 ch at the 2.3 ohm load is fine, and if that sub box final load is at 2 ohm then you are fine.Just got to lower gains down and not crank everything up on the HU, Like LOUD(I never use) (BASS BOOST) I never use. 120HTZ or Through for basic setting i use on Mids and highs and approx 1/2 gain or turn up to where Ill be playing majority till I hear speakers disrtort and turn gain down a 1/4 till no longer noticable, been working for me just fine for over 20 years.That Amp will shut down if it gets too hot(Supposed to go into protect)Safe mode.