overheating


hi i have an MA 6900 mcintosh amp only problem when driven hard for a long period will cut out on thermal overload any thoughts out there on cooling.
hopey
thanks, det.tech.speakers do it easy .lower volume great idea .but this is a party room and we may not be audiophile purists but we love music,i was thinking maybe some sought of cooling fan or more heat sinks or whatever, any thoughts?