Strange that the K30 is so loud - compared with the K5 and other sealed body versions... I've only used 2 DSLRs - the K30 and a borrowed-for-weekends K200D - and the K30 startled me - it's "more modern" than the K200 - but the 'clack-chunk' is sharper, less "sealed-inside" sounding, and louder.
Perhaps the lower models in the range have to have louder shutters to make the top-of-range models sound more 'Rolls-Royce silent'.
Or it promotes sales of longer lenses to get the camera clear of anything that would be startled by the sound...
And in any crowd or gathering, where most are waving their P&S devices - it certainly announces to anyone within 10-metres / 33-ft - in quieter areas, that you have a 'clack-chunky' DSLR - not always to the amusement of Security, perhaps.
Perhaps some padded "camera-armour" around the K30 would suit those who'd prefer it to be quieter.
Regards, Dave.