I just hooked my 300/4 back up after about 8 months and when I started the car up the low ohm light came on and the right-rear speaker was hissing. The amp worked fine up until the day I took it out of mm old car. I figured there must be a short in the wire, but when I disconnected all of the speakers to narrow down the probelem the low ohm light stayed on. Someone PLEASE tell me how the amp can read low ohms when there's no speakers connected!!!
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are they subs or door speakers? if they are subs, then speakers ohm load is too low for the amp. If they are speakers then again the ohm load is too low or one the speakers are blown are shorting out against the door. sometimes when mouting speakers in the door, the terminals are accidentally touching some metal inside the door.
Because you've done something with the speaker connections that's too low impedance for the amp.
Amps need a certain level of resistance from the speakers otherwise there's a risk of the amp blowing itself up. Impedance is the name for resistance that varies with audio frequency. If the speakers you connected are any good, then there'll be label on the back telling you their impedance in Ohms.
When running a single set of speakers only then the amp would prefer an 8 Ohm load but it will accept a 4 Ohm load. If you plan to run speakers in both the A and B sockets, then both sets of speakers have to be 8 Ohms and no less. It also tells you this on the printing directly above the speaker sockets on the amp.
The amp is trying to protect itself from an overload situation where it would blow its output transistors and possibly kill your speakers too.
Gotta be careful here....the headphone output won't drive a speaker - if you already have all other speakers connected on the back as designed, you really don't have anywhere to connect a 4ohm speaker. The "front" speaker jacks have an "A" and a "B" section but they appear to be in parallel so you really shouldn't connect a 4ohm speaker to "B" for example if you already have speakers connected to "A". The combined impedance would be too low for the amp design.
your speakers rating is too low for your amplifier. 300 watts RMS means the speaker can operate on an average of 300 Watts continuously. the 1200 watt rating is peak wattage input and meant for intermittent intervals only, a like a bass drum beat count. also , your speaker impedance must match your amplifier impedance or the speaker must be a higher impedance than the amplifier. Never lower than the amplifier's impedance output rating. If The amplifier is rated into an 8 ohm load, your speaker must be 8 ohms or higher. in other words you cannot use a 4 ohm speaker or you will damage the amplifier .
If the low ohms light is on then you have your speakers wired to low. I need to know some more info like what type of speakers you have running on this amp and how many. Also was it working before and then it started doing this? Check the ohms with a volt meter if you know how, if not just get a volt/ohm meter and set it to the ohms setting and then take the positive(red probe) and touch it to the positive terminal on the speaker and then the negative(black probe) to the negative terminal and see what it reads. Make sure you check how low in ohms your amp is capable of handling. If you don't know just google the model of your amp and you will find a site that has a manual or just go to JL audios web site and you should find out there with no problem. Let me know what you find so I can assist you more if need be cause I also repair amplifires for a living and have many years experienc and I'm the cheapest amp repair business you will find any where. Good luck
Most likely one of your subs are blown, or the Ohm's are too low for the ampliphier. Try hooking up one speaker at a time to the amp and see if it does the same thing. If it shuts off on one of the two speakers, that speaker is most likely blown.