Got an iAmp 800 definitely does 2 Ohms (1Kw)..If the cabs are nearer 6 Ohms and the amp has a low current capable PS that would almost certainly trigger the thermal pretection.... as above try one cab.. if all is well i'd be sure that impedence matching is the issue... the iAmp 800 has a large (hence 19lbs weight) toroid for just that reason... andsounds great btw!!!