Maximum PC: When's the last time you listened to a system with integrated speakers and thought, 'Wow, these cans sound fantastic!'? Proabably never. Built-in speakers typically stink, though there are exceptions. Might Acer's new Aspire Z3-605 all-in-one (AIO) be one of them? It's Acer's first desktop with Harman Kardon speakers, which the company confidently claims "sets a new standard for AIO sound quality."