The hd line is a line of a channel amplifiers with frequency bass response to sub acute average.
They are products ranging 800-8000 watt of power, applied in several areas aimed at that relates to automotive sound, internal or electric trio.
The hd amplifier is a high performance product, innovative design and edges (front and back) in abs, which provide more security at the time of installation.
Hd amplifiers have RCA inputs (l and r) to take advantage of all the mix of music, directing to a single output.