Mackie 2042348-03 Amp/Power Supply PCB for SRM450V3 | Full Compass Systems
Mackie Circuit Board - 055-078-00 for sale online | eBay
Phil's technical blog : Power supply toroid in Mackie SRM450 PA loudspeakers
I have a Mackie HRS120 that needs power supply caps replaced. Can't get under the PCB to desolder them because a number of the transistors seem firmly stuck to plate amplifier grill.