Cerwin-Vega INT-152 V2 800-Watts 1x15 Inches Passive 2-Way Loudspeaker Stronger drivers by beefing up the build quality with the addition of more steel. Enhanced durability by upgrading the cabinet construction with internal bracing. Better performance is achieved by increasing the size of the magnets on the compression drivers. Improved dependability from a positive temperature coefficient (PTC) thermistor that protects the tweeter. This component acts as a self-repairing fuse allowing the speaker to return to normal operation once the input fault is corrected.