I just installed my PA D40000.4 which is driving one pair of DB651's and one pair of DB 6501's. Head unit is a kenwoodKDC-X596 which has 4 volt preamp outputs. Amp is installed under a Suburban front seat with 4"-6" all around.
Normal listening volume is at about 20-24 volume which seems high to me. At 28 (out of 35) the amp goes into protection mode. It is warm to the touch but not hot.
Possible culprits would be a partially shorted speaker wire? All speakers are working without undue distortion. Can an in sufficient ground cause heating or the amp? It's grounded right to the body with only a 4" cable. I'm going check to make sure enough paint's been scraped off. Incorrect tuning settings?
Any help with common causes would be appreciated.