Question about Crunch P125.4 Car Audio Amplifier

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My amp is on but no sound

I have had the amp working for months i disconnecter the sub today with the power off to change the box attached the same sub in the same connector on the amp yet all i get i nothing the green lightfor power comes on and i have a red protect light that now glows i have checked and double checked the wires but nothing please help its driving e nuts

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Did you disconnect the battery? You may have bowwn a fuse, but that prolly wouldnt give you a protect light. Protect light usually means a short circuit, probably on the speaker end, sure there couldnt be maybe a single strand of wire crossing over the positive and negative speaker or amp terminals.

Posted on Mar 01, 2008

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I have 2 amps instalkled in my car one is sony 1200w 2 channel amp for speakers and one is solid audio f2500d for 3 subs my sound and every thing was good but suddenly from yesterday im having trouble when...


First disconnect the CD head unit from the sub amp and see if the other amp works. If yes, the problem is the wires to the amp, the amp itself, or the subs/sub wiring. If no, the problem is the head unit--probably an internal short.
If the other amp works with the sub amp disconnected, reconnect the sub amp to the head unit, but disconnect the sub wires from the amp. Try the CD player. If the amp goes to protect with no speaker wires attached, the amp is bad. If the amp is OK, the problem is the subs or sub wires. Hook the wires up to the amp again, but disconnect them from the speakers. Try the player again. If the amp goes to protect, the problem is the amp wiring. If not, the problem is the subs. Check the impedance of each sub using an ohmmeter to determine which amp is out of spec.
Please let me know if you have questions, and thanks for using Fixya.

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it sounds like it could be a blown channel in the amp. if the sub was blown it would still work just sound horrible. i have blown many subs and amps. you can bring it to an audio shop near you and they can fix it. i just got one of my channels fixed for 35$

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Um the power light will flash then the protl. light will flash its all hooked up right but weird sounds coming out my subs.


Disconnect subs from output of amplifier and then turn on car and radio. Does amp stay on or go into protect? If it stays on then there is something wrong with the subs or how they are wired (series, parallel ) to the box and amp. If it still goes into protect then something internal with amp.

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when you car is running, it charges the battery somewhat. So the voltage problem is not a problem. The red light means the amp is going into ''Protect Mode". This usually happens when something is wrong with the amp. Usually the amp is getting hot. Check all of you connectiong and check the final impedance of the subs. Make sure the amp can handle the impedance of the subs. If you need anymore help, message me.

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sounds like the amp is in protection mode. try disconnecting the subs and see it the light changes to green. if it does then the subs are your problem. if the light was allways red while it was working then the subs may be disconnected inside the box or have gone bad. try using a diffrent speaker and connect to the amp.

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