Conclusion: If I had to sum up the GMX A-2.1 in a single sentence, it would most likely be 'One of the best sets of stereo speakers I've ever heard'. For audio from two-channel sources, it's hard to imagine Klipsch's offering being beaten (particularly in the price range in question), the entire listening experience is an absolute pleasure and is genuinely all but impossible to fault.
Summary: The question here, is 'how loud is loud enough?' Surely these speakers from the Kilpsch Promedia series, would answer that question. The package screams 'bad ass', from the heavy duty appearance of the satellites, to the bulky beast of the subwoofer. We struggled to find appropriate descriptors although 'thumping', 'powerful', and 'nut-rattling LOUD' came to mind.