@ChewingGum: Like I mentioned earlier, try giving a 100+ ohm resistor a shot... I found that it brings up the treble, flattens bass, and makes vocals less distant, more transparent, and all that jazz. I don't know if it will be the miracle solution that will address all of you issues with the C4, but heck it can't hurt considering it only costs like $10 - plus, I think it'd bring the C4's closer to your desired sound signature.
Cool, thanks for the tip, itshot. Do you have any links to appropriate resistors?
I'm not sure if this is directed at uelover or me. For what it's worth... in my opinion, there is only ONE interpretation of neutral. That is: Technically Neutral, in other words - flat FR and fast drivers (short decay) across the spectrum. OK so there is some lee-way given the recording equipment and the ears of the mastering engineer. But if you've listened to enough mixing sessions (I work in broadcast post production so take a dubbing suite running ProTools via a 192 into good monitors eg Genelecs as my reference), you know what neutral means.
If people have their own tastes and preferences, that's fine, but there is no question as to 'neutrality'. In my case, I prefer a more treble-y sound compared to the average joe on the street. I do not, however, let this personal preference influence my understanding of 'neutral'.
Sorry if this sounds like a mini-rant, but I am sick and tired of reading poorly written reviews etc, in which words like 'neutral' are used not so much for their specific meanings, but rather as a generic compliment (ie 'neutral' = I like this sound because I have awesome ears and the internet tells me awesome ears appreciates flatness). Ugh.