No ... that sounds about right if the 250W amp is RMS.
Best to underpower speakers and subs.
As a musician with a studio I can tell you I have killed so many speakers / amps / PA's over the years I wish I had underpowered everything.
It gets expensive when you kill the compression drivers in a couple of big PA can's because some idiot overdrove them (me).
Not as expensive as when you kill the PA head though ...