Summary: I am searched amplifier for best price/quality. You can see the characteristics in chart, I am not will be to repeating it. The amplifier Pyle PQA4100 is very powerful. It can work in bridge mode. It have overload indicator. The fan (cooler) work constantly, the noise like from computer fan. It not very sensitive, the sound from the source like notebook need to be preamplifiered. I am tested it on 8 ohm MAG 1580 in tapped horn cabinet. The sound was great, very powerful.