So I'm new to these forums and I'm not sure if this is a stupid question or not. So I have two floor PA speakers, (WELTON AUDIO PS412-1 TOWER SPEAKER). They have a rating of 150 W NOM (I'm assuming RMS) and 400 W max. I currently have them running them through aa Adcom GFA-535 II preamp which is rated at 60 W RMS. I wanted to upgrade to a more powerful amp so I purchased the musysic sys-2000 amp which is rated at 250 W RMS at 8 Ohms (which I'm assuming is the resistance of the PA speakers. According to these numbers I was under the impression that the new preamp would blow the Adcom out of the water. However after comparing the two preamps, the adcom is by far louder and cleaner than the musysic amp. What am I missing here? And if I did want to power my speakers effectively would preamp would you recommend? I can't post any links to the items i own since I'm a new member hope you guys can help out.