Dude... I'm not sure how accuratet hose specs are, but it is listed as a 1200 watt amplifier. Devide that by 6 that's 200 watts per channel. Now, more than likely your sub is gonna get more power than the rest of your speakers, so I doubt it is split like that. More than likely each channel gets under 200 watts, while the LFE is fed more than 200 watts at peak.
Yeah, that should be a pretty loud system dude. I know it depends on other things such as frequency range, SPl, etc... but just going off the specs on that Amazon listing you got a pretty decent setup dude.