At certain venues  I have to run the Tyros, Wireless mic and Powered speakers through a 25 ft. extension chord. 

The required amperage appears to be a low for the equipment.  There are trade offs for going for a lower gage chord namely flexibility, cost, and weight. 

Curious what gage chord people are using , and if they have experienced any damaged equipment with a higher (cheaper) gage extension?

Regards,

Jerrghr