The Crown Macro-Tech 02 Series amps are enchanced versions of the Macro-Tech line. They offer the same features and performance of the original Macro-Techs while delivering key added benefits that continue to expand the versatility of this distinct product line. Here are a few examples: Enhanced PIP2(TM) (Programmable Input Processor) connector accepts new accessory modules that tailor the amplifier for specific applications. Balanced XLR and 1/4-inch phone jacks for each channel on the standard PIP-FXQ module.. Full Protection from shorted, open and mismatched loads, general over-heating, DC, high-frequency overloads, and full internal fault protection are provided by our latest protection scheme: "Quad-Mute.