not even 2 ohm below 12.8 they do not like low voltage AT ALL! I had my 5 k that is only 2 ohm stable wired to my subs at 2 ohms and did not monitor my voltage properly and poof burnt the board! It was my fault I thought I had enough bank battery but I did not monitor voltage. Then I got the 14k and monitored my voltage and upgraded to JUICEBOX batteries and I was able to do .5 so I would vote do it! over on another FORUM the one we dare not speak of JEFFERSON talked about how he runs his at .5 and just monitors his voltage with no issues for daily and he lives in florida. where its HOT!