Originally Posted by gperkins1973
My amps never clipped or subs bottomed out. The gets really hot and cuts out way way before any off the above. Bl**dy annoying. Will probably have to revert back to stock fan to know for sure even though the fan I am using is still rated at 34 CFM where the stock one is 54 CFM.
Did you leave the fan orientation in stock configuration when you swapped out the fans. I think it might be a mistake to reverse the flow when you lower the CFM. The engineers designed it the odd flow direction they did for a reason. Stock config is intake through the rear, blow directly over the heatsink and outake at the front of the amp through the filter.
I've heard people say it's most quiet when exhausting out the rear with their low cfm fan, but then they've lowered the cfm and made the heatsink exhausting less efficient! Two whammys.
At any rate - I kept the stock fan config oreintation, and just lowered the fan's cfm. My amp runs at 2ohm stereo mode with two JTR captivators and barely gets warm at tolerable volumes after 15 minutes of music playing in home theater duty. It is very nearly silent as well. In the stock config after 15 minutes of playing in the same config it was difficult to feel any temperature increase from ambient on the amp's cover or exhausting air. Both seem to have no problem with both the amp gain knobs maxed on the ep4000 amp and plenty of volume for my home theatre at stereo 2ohm load.