hi, im having problems with 2 of my bbxs and need some help, the first is a hitachi trk8600 - it sounds great with the loud mode off but if you turn up the volume with it on you get audiable clicks on the woofers wich seem to be when the bass comes it will go if you turn the bass down but it isnt distortion, do i need new woofers of is it worse also the volume is a fraction quiter on the left channel.

bbx no2 is a hitachi 3d twin drive, yet again all in working order but the highs sound very screechy and blurred its hard to explain what it sounds like i just know its not right, the bass is great this is only a problem with the vocals and highs, the lights on the front seem to dim i lot when the bass kicks so could it be a power issue as it seems ok on batteries or at least much improved sound. your help will be greatly appreciated as these are great boxes and i want them to thump how they should!