Send it back. 100 x 2 is not even an upgrade.
Go for 250 x 2 at least - so you have lots of power to prevent clipping on very dynamic music recordings(
though most recordings are not very dynamic, and this power will probably never be needed).
BTW, if you look past over-priced home amplifiers, you can get a pro audio amplifier that is better in construction and performance(power and load handling) for a lower price for comparable power ratings in most cases.
-Chris