Amp turns off or goes to protected mode during long low base
On some songs with deep low base my amp will switch to protected and i will have to turn off my cd player and turn back on for it to start playing again. It doesnt do it on all songs, it does best on songs with short burst's of base
Do you think i just need more power to my amp or is it the subs cant handle the base
Re: Amp turns off or goes to protected mode during long...
Let me take a stab at it
There are two types of resistance... Static and dynamic. These resistance change depending on the position of the cone. Now im guessing the short bursts of bass are not small ones.
If the cones are forced further than allowed the resistance of the combinded drivers may drop below the rated impediance for the amp...causing the amp to into protection to keep itself from over driving itself (the less reistance a amp sees the more power it will produce, till it essential blows itself up)
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Disconnect all speakers
Meter power, remote, ground at amp, if all is good move on, if not check main fuses
Turn amp on; If in protect mode then your amp is toast
Turn amp on, if not in protect mode then start reconnecting speakers one by one until your amp goes into protect mode, then you'll know which speaker is bad.
One of your speakers might have burned out, shorting the wires that connect it to the amp. Disconnect one speaker at a time from the amp, turn it on(try all four, turning the amp on and off each time you disconnect a speakers wires) and you can pinpoint which speaker might be causing the amp to go into protect mode. If you disconnect all the speakers and the amp still goes in protect mode, then the amp is shorted internally and will need to be replaced or repaired.
The "safe mode" on your amp usually kicks in for two reasons - the ohm load on the sub is too low for the amp (presenting a "short" to the amp), or it's going into thermal protection because the amp is too hot. From your description, it sounds like there's a short in the wire, the sub's ohm load is too low, or the sub is partially blown.
If you have another sub or speaker, connect it to the amp's output and see if the amp still goes into protection mode. If the amp goes into protection with a known-good speaker, then there may be something wrong with the amp's power supplies. If the amp works properly with another speaker or sub, then I would check the sub that's causing it to short out.
You may also want to check whether or not the amp is over heating by just touching the amp when it goes into protection. If it's just warm, that should be ok - if it's hot, then it might be working too hard. In this case, you may need to check the input voltage (12-14VDC) and the size of the power and ground cables. If your ground isn't properly connected, it can cause weird problems like over heating, shorts, erratic behavior, etc...
Check your ground and make sure it is grounded to metal in your car with no paint. Also, make sure you are running 4 gauge power wire. Another possible cause could be that the ohm load is too low on the amp. Also, if your car battery drops below 10v it will send the amp into protection.
First try unhooking the speakers and see if it continues to go into protect mode. If it does'nt then your speakers are running to low of ohms required for that amp causing it to go into protect mode. If it still goes into protect mode check your ground, might have a voltage problem and check voltage going into amp. I have read the manual and this amp has advanced circuit protection. So if all I have asked you to do and it still goes into protect mode then amp is faulty and has some output transistors shorted or power supply mosfets shorted. Let me know what you find. But you need to do what I have explained to narrow the problem down. Good luck, Keep me informed. I will be glad to help you thru this. I also have a business of repairing car amps and you will not find anyone cheeper. So if you want it repaired and you feel you can't do it, just send it to me and I will repair. If you decide this E-mail me at:firstname.lastname@example.org and we can discuss it in more detail. Just a thought to try and help you out. I have many customers that send me there amps and I repair them and ship them back. A few come from this site. Let me know
If the amp is in protect mode, it probably has shorted output transistors. To eliminate other possible problems, do the following.
With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage drops below ~11 volts, you need to check the wiring feeding whichever line is dropping too low when the amp goes into protect.
If the voltage is OK, you need to check the speaker wiring and the speaker(s). Try it with a known good speaker if possible to see if the amp works normally.
If the amp still goes into protect mode, the easiest thing to do is disconnect the RCA cables from the amp and see if still goes into protect mode (after turning off/on). If it does, the issue lies in the amp or the wiring to/from the amp (most likely case). Check to make sure no speaker wires came loose and touched +12V or ground (car body). From the sound of it, my guess is something internal to the amp died and will need repair.