The outside fuses are for speaker protection. The largest you should use is a 5 amp fast blow. That will allow all 200 watts to be realized. This may or may not be appropriate for your specific speaker. Check with the manufacturer.
Also, if I read your comments correctly your may have had a "hard blow", which may indicate a serious problem. Normally when a speaker fuse blows from just being over driven the filament separates without leaving any residue on the glass.
Regards,
Dean