Sleuthing a 300/4 low-ohm issue. 300/4 amp history: unknown. just connected today whole system yesterday/today: head unit, 300/4(to 4 polk 6.5" component speakers brand new) 1000/1 (4-W3's), to brand new polk door speakers (4 ohm), 1600 watt scosche wiring to dist-block, 1 farad cap on 1000/1. amp plays, no distortion, all is good...until...I begin to turn the volume up, at that point the low-ohm flashes on/off intermittently, at higher volume it blinks more often then stays on....while music plays, until very-loud now, amp cuts out. green light stays on. after short pause and lower volume, amp cuts in again. source voltage hot = 13.9v, used a grinder to clear grounding connection. meticulous detail. I have repaired amps before by replacing output mosfets (digi-key). knowing that heat affects all circuits, would it be likely that i have an output mosfet that is on its way out and due to heat, and as the amplification output increases it begins to short? I did run multi-meter to each mosfet and did not see any near-shorts. (of course thats when its all cooled down though) thanks for your input.

remember, its the 300/4 that's cutting out with the low-ohm indicator, not the 1000/1. It uses the same distribution block as the 1000/1 so if an amp was to power down due to low-voltage: a: the low-voltage light would activate on the 1000/1, and b: it would be far more likely that the 1000/1 drops first IMO.

I'm thinking the unit itself has a quirky (read dying) internal component. The question is: what component would most likely be the culprit to produce this scenario. remember, its the 300/4 that's cutting out with the low-ohm indicator, not the 1000/1. It uses the same distribution block as the 1000/1 so if an amp was to power down due to low-voltage: a: the low-voltage light would activate on the 1000/1, and b: it would be far more likely that the 1000/1 drops first IMO. I'm thinking the unit itself has a quirky (read dying) internal component. The question is: what component would most likely be the culprit to produce this scenario.

Sorry MAW31 I've never driven that far into an amp. I would normally either return the amp if possible or get a new one. Have you tried running the 300/4 by itself unhooking the 1000/1 to see if you get the same response. Just a suggestion. It could be the 300/4 has a more sensitive heat response. If not sorry I couldn't help Sorry MAW31 I've never driven that far into an amp. I would normally either return the amp if possible or get a new one. Have you tried running the 300/4 by itself unhooking the 1000/1 to see if you get the same response. Just a suggestion. It could be the 300/4 has a more sensitive heat response. If not sorry I couldn't help