In 2021 ATOM amplifiers adopt an adequate Class D performance reliability and footprint of the original ATOM and iOn platforms. At first glance youll notice several key improvements. Atoms signal inputs power ground and speaker connections are all relocated to the chassiss leading edge for a more comfortable more appealing install. All pre amp & crossover options are conveniently located on the backside. You might not notice additions to the circuit board including improved power supply and output stage components and monoblock bridging capability. The installation of ATOM amplifiers is unique using mounting pedestals at each corner. The pedestals elevate the heatsink improving airflow around and underneath the chassis. Additionally rubber grommets under and inside each pedestal electrically isolate the amplifier chassis from the vehicle chassis reducing the potential for ground loop noise., ATOM Series Power Amplifiers, 1Ch Monoblock Class D 1 Stable, RMS Power 4 400W x 1, RMS Power 2 700W x 1, , , , , , , Weight (lb)6.45, Height (in)8.7,Width (in)3.4,Depth (in)14.2