I was looking on the US acoustics website and it said that their usx 600D had just a 20 amp draw. can someone tell me if this is true or just a typo, that seems super low.
No way it can put out 600W RMS with only a 20 amp draw. *Assuming* the amp was 100% efficient, it would only be capable of a max value of 288 watts, RMS would be lower than that. Expect at least a 60 amp draw for 600W Class D amps.