overheating

First check to make sure that there are no restrictions to air flow to the amp. If not, then yes you can use fans, but if your Def techs are a current model w 92 db 8 ohm sensitivity and you are pushing a 200 wpc amp so hard it goes into thermal shutdown, you might want to consider going w a pro sound reinforcement system (and buying stock in hearing aid companies)!!!! Really, dude, Unless your "party room" is the size of an auditorium, that amp should be able to push those speakers to 110-120 dB levels which will toast your ears pretty quickly.

Are you using any bass boost(Loudness, EQ, etc) while
listening? That can overdrive an amp easily, and cause
overheating.

some good thoughts there i thank you ,yes it is a big room and yes where all old and deaf !but i still feel as if a cooling solution might help .

rodman may be on to something. Bass boost would increase power demand significantly.

Fan behind amp, blowing onto amp. Doesn't need to be a big fan. Should be able to set at Low, little/no noise. Preferably plugged into separate outlet.