Well i own a blackheart little giant, and honestly speaking changing the tubes does change the character of the amp quite abit, but after talking to goose abt it, i am convinced that for the little giant to reach it's fullest potential, it definitely has to be modded. As for the standard speaker it sounds gd and decent for the price u pay for (not bad in anyway unless u compare with the high end speakers), although wat goose say abt the chinese eminence may be true and swapping the speakers to a gd celestion and eimnence may just do the trick but it is up to ur own judgement. Cab construction wise seems good and it is a close back so with a speaker swap, it may just sound really good imho without splashing cash on expensive cabs.