For those of you not familiar with ZAPCO, they truly make some of the finest amplifiers out there. These are the DC Reference series, which means not only are they built to very exacting standards, they also include active crossovers, parametric eq functionality and are balanced amplifiers (SLDIN.T balanced line adapeters included) to effectively remove any chance of noise/interference sneaking via your interconnects.
411 can be found here: http://zapco.com/DCReference.html
These are possibly the best car audio amplifiers I have ever had the privilege of owning and listening to. I am very sad to see them go and am hopeful one of you lucky Camaro5 members will pick them up.