Auto protect after operation of at least 6 years on daily basis as sound amplifier, the other day the auto protect mode shutdown the amp. I checked and rechecked my speaker wires to all speakers and unplugged the sub thinking it might be my problem. It ran a while then shutdown again, takes a long reset and now I muted after 5 mins operation and shutdown again. Does the auto protect get weak or the power amps? Or should I think new unit? J in colorado

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as a root cause for ntermittent shutdown.

http://nadelectronics.com/products/hifi-amplifiers/C-326BEE-Stereo-Integrated-Amplifier

Page 6 and 13

1. The battery is 12 volts and Ohms has nothing to do with your amp installation.
2. 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.
3. You need to check the ground wire real well. A loose ground will cause protect mode.
4. Recheck the speaker wires and their connections. If they cross this to can cause protection mode.
5. 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.
6. 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.
7. Check the fuse as well but if the LED is on chances are your fuse is good.
8. If you check all of the items I listed and the amp still goes into protect mode then your amp is bad.

Regards, Tony

Protection circuit.
Checek the wiring of the amp and speakers, don' forget to look for shorts at the speakers. Make sure no wires are touching each other

sounds like your amplifier does not have the power that your subs need check the rms out put on your amplifier and check how much rms your subs can handle if your amplifier has less rms power then your subs theirs probaly your problem that what happens when it kicks in to protection you could in up fring your out put chips in your amplifier not trying to say that the problem but check your rms power make sure the amp and subs can handle the same power

if it goes in protect mode means ur amp is turn up to high or it is over heating so it protectn it from fryn ur amp try to adjust it down

Disconnect the speakers. Measure their resistance from black to red with an ohmmeter/DMM to make sure that a shorted voice coil did not cause the shutdown

There are 4 reasons an amplifier tries to protect itself.

Overheating - thermal shutdown.

Over Impedence - The subwoofers installed are not configured into a load the amplifier can handle.

Output is grounded - a positive wire strand may be touching the ground terminal - a wire may be shorted, or a speaker voicecoil is blown.

Intennal problem - Output on amplifier blown, or some other component has failed.

Check your wiring to the amplifier again - if all is good - disconnect the speakers and try to power on. If the amplifier turns on normally - test the speakers for blown coils.

If the amplifier still goes into protect mode - the problem is internal and needs professional repair.

Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

disconnect speaker,turn gain down to about 10%.repower amp check and see if protection light comes on.if it does recheck power,remote,ground,if it doesent go into protection then kill power and rewire speakers

i dnt knowwat type of speaks u got but ifits low then it cud be tht u have too open up the second coil on ur speakers...dnt sound like the amp since its on & not in protect mode,other than tht i'll recheck the wiring

recheck your ground make sure it has a good connection most of the time this is what it is