The new Z-Series of SQ amps was not conceived so much by our engineers but by input from audiophiles and car sound fanatics around the world. Starting about 2004, at Zapco training seminars in Asia and in the EU, we began running into audiophiles who were changing certain internal components in our amplifiers to achievewhat they felt was better quality sound.The seed of an epiphany was planted one day in a heated discussion about amplifier specs when a highly respected audiophile said "maybe your amps are too fast".Our reaction was immediate. Too fast? Ridiculous! An amp can't be too fast. But, as time went on, we began to discuss the possibility that we had chased the specifications to the pointthat we were no longer improving the sound.For example: If people cannot hear the effect of damping beyond about 200, why do we take it to 1000, or even higher? How does taking specs to the extreme effect other aspects of sound?So for the new Z-Series of Zapco amplifiers, we experimented with internal components to see if we could take out amps to the next level of sound quality by investing in different internal components. How much would different component choices affect the overall sound quality?What we found was that electrolytic caps, mylar caps, and tantalum caps all sound different. Different Op-Amps sound different...even if they have the same engineering specs. Output devices all sound different even though they put out the same voltages. Even the layout of components on a board will affect the sound of an amplifier. And ultimately, we found that different combinations of Op-amps, capacitors, and output devices allowed us to make a major difference in the sound quality of the amplifiers without changing the specs.The Zapco Z-Series amplifiers use the best combination of NJM5532L and OPA2134 op-amps, Tantalum capacitors, and high speed KEC and Sanken output devices to bring you what we believe are the best sounding amplifiers we have ever offered.Max RMS Power 1000 Watts @ 350-Wired remote control (optional)-Dimensions in Inches : 7.5(W) x 3(H) x 12.25(L)The Z-1KD amp gives you some amazing power to drive your system while keeping the specs of an SQ class amplifier.