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The battery is 12 volts and Ohms has nothing to do with your amp installation.
Was the amp running and got hot? Many times an amp will go into "thermal mode" when used for an extended amount of time and need to cool down but I assume if you are trying to hook it up you were not using it.
You need to check the ground wire real well. A loose ground will cause protect mode.
Recheck the speaker wires and their connections. If they cross this to can cause protection mode.
This is a 4 Ohm amp, are your speakers 4 ohm or lower> If not then you may be running to low of a load to your amplifier.
I always remove everything from the amp first and power it on and then add wires and see where which connection throws the amp into power mode.
Check the fuse as well but if the LED is on chances are your fuse is good.
If you check all of the items I listed and the amp still goes into protect mode then your amp is bad.
Yes, you can do this easily. Perform the following steps (1)Plug your amp to AC outlet. (2)Switch it on. (3)observe time taken for switching off. (4)immediate to shut down over current protect(5)3 seconds to shut down DC protect. If over-current protect do the following steps (O)unplug the amp. (1)download NR806 service manual. (2)open the amp metal cover. (3)measure 7 large white resistors resistance loacated next to power transistors mounted on a large heat sink with black probe touching the middle pin and red probe to first/left or third/right pin. (4)If this 3 Pins large white colour 0.22ohm x 2 resistor is open with infinity ohms , (5)replace it and jot down this channel for example left surround faulty. Usually only 1 channel went faulty. (6)the two large power transistors next to this white resistor 0.22 ohms x2 should also be replaced. (7)plug the amp (8)switch it on (9)if ok, troubleshooting get done (10)if not ok (11)replace ALL the components of this power amp channel. (12)pre-amp section no need to check.
Sounds like the out put stage of the amp is shorting, They are either 4 large transistors attached to an aluminium plate (heatsink) or one large chip with heatsink. also sounds as the driver stage went too when you switched it on the second time. If you know nothing of electronics I suggest you take it to an audio repair shop, as it is cheaper to repair than replace high power amplifiers.
I was moving around my large woofer speaker last night and then all of a sudden the unit went into protection mode. I tried all the various solutions posted on here and nothing worked. Then I went back to my speaker connections on the woofer and unplugged them and plugged them in again and it seems to be ok now. Very annoying problem. Can I suggest unplugging all the speaker cables and replugging them back in. Also another solution may have been holding down the power button when powering up the unit. Give all the above a try.