What is the difference between the 304 and the 330 if you don't mind me asking?
26. You're welcome.
I dunno. They both have MB Quart's signature Ti dome tweeter and poly woofers. The 304 is front ported; the 330, rear. Maybe the 330 has a more refined crossover?
I'd guess the best way to predict the difference is to say that they're just different series, that the 304 is closer to entry level, or from an earlier year. I can say that I don't get quite the same sense of airy transparency from my 304 as I do from my Vera mains. Not often, but occasionally it sounds a little nasal. There could be any of a hundred explanations for this, ranging from more compromises made for lower production cost (less meticulous phase matching in the crossover, cheaper drivers) to poorly recorded source content (most of my 5.1 listening comes from cable TV) to user error (poor choice of placement, non-optimal HPF frequency setting, lazy room correction). Nevertheless, dialogue is still clear and pleasant, and usually pretty convincing. I'm being hyper critical to let you know not to expect a miracle for less than $100. Be that as it may, I'm in no hurry to upgrade.
Unfortunately, I haven't heard the 330 center. It could be that the 330 sounds $250 better.