Originally Posted by
EarmarkMarine
rd,
Yes, low voltage will compound thermal issues. It appears that you are running the Harpoon at 2-ohms so I suspect low voltage as a contributing factor. At 1.33 ohms on a 'hybrid' I would be far more concerned about thermal issues, particularly in the South.
A blower fan? Do you realize how noisy those fans are. Not a good option.
After the amp shuts down and has just enough time to recover, measure the voltage at the primary supply terminals of the amplifier with a digital multimeter as it repeats a shutdown. This way you will know for sure if low voltage is a major contributor. No use in chasing the wrong prognosis.
There are two parts to effective fan cooling. First, elevate the amplifier with standoffs and use a fan shroud in conjunction with a fan. Circulating the air around the fan rather than across the maximum heatsink surface area is a waste of a good fan. Second, exchanging the port locker air with the outside which may be 35 to 40 degrees cooler. This requires an exhaust fan and vent in the exterior locker. You can place a second and intake vent in the floor hump right next to the bilge hose and take advantage of the built-in provisions.
The right fans will be whisper quiet.
David
Earmark Marine