Question about Jl Audio 300/4 Car Audio Amplifier

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Low ohm light on with no speakers connect??

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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Re: Low ohm light on with no speakers connect??

This can happen if the amp has an internal fault such as a shorted output transistor.

Posted on Dec 26, 2007

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My red light wont cut off

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.

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Low speaker impedance

Most in a car would be 4 ohm, for the low impedance connections, and 8 ohm for high.

Jan 15, 2014 | Audiofonics Car Amplifiers

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Jl audio 300/2 amp not working, yellow " Low Ohm" light on

Sounds as if you have the speakers hooked up improperly causing too low of a resistance. Re wire to increase resistance.

Sep 06, 2010 | Car Amplifiers

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Jl audio 300/4 low ohms light wont go off

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

Aug 15, 2009 | Jl Audio 300/4 Car Audio Amplifier

2 Answers

I have 1000 watt sony XPLOD amp and i just installed it today. with new monster cable&ground. the green light turns on& thumping goes for a little. i try to raise up just a little bit& after 2...

it isnt getting enough power and its tripping the internal switch on the amp and putting it in safe mode. either your wire isnt a high enough gauge. you might need a capacitor or you need bigger wire.

Jun 13, 2009 | Sony Xplod XM-554ZR Car Audio Amplifier

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The MRD-M300 has speaker-level inputs so you can easily use it with any car stereo. Hook it up and hear what good bass can sound like!
  • 150 watts RMS x 1 at 4 ohms
  • 300 watts RMS x 1 at 2 ohms
  • MOSFET power supply and output stage
  • STAR Topology for cleaner sound
  • Bass Engine® features:
    • low-pass digital crossover, 30-200 Hz, 24 dB/octave
    • variable subsonic filter (15-50 Hz in 5 Hz steps)
    • parametric EQ variable from 30-160 Hz
    • Bass Compensator enhances low-end definition
  • top-mounted digital control center with cover
  • time correction 0-10 milliseconds in 0.5ms steps
  • phase correction 0-180° selectable
  • digital readout
  • detachable front cover
  • blue power LED
  • delayed turn-on
  • requires 8-gauge power and ground leads — wiring and hardware not included with amplifier
  • speaker- and preamp-level inputs
  • gold-plated terminals
  • 8-5/16"W x 2-11/16"H x 11-1/2"D (10"D without front cover)
  • 1-year warranty

May 29, 2009 | Alpine MRD-M300 Car Audio Amplifier

1 Answer

1000 w sony xplode works at low volume then red lights at volume5

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.

Apr 19, 2009 | Sony Xplod XM-1652Z Car Audio Amplifier

1 Answer

Legend Amp hook up manual.

Pretty Straight Forward get a 8 or 4 gauge amp wiring kit.

Run your hot wire to the +12V from the battery make sure to install the supplied inline fuse near the battery don't connect to the battery until installation is complete.

Run the REM to your stereo power ant. Wire. if available.

Run the GND to Metal Chassis Ground keep it as short as possible.

Run the RCA Cable from the back of the Stereo to the RCA Inputs or Low Level on the amp.

This amp is 2 Ohm Stereo Stable which means you can connect 2 (4 ohm) speakers in parallel to each channel or 1 (4 ohm) speaker on each channel or you can connect 1 (4 ohm) Speaker in bridged mode.

There are other speaker configurations you could use but you cannot drop the load below 2 Ohm in stereo mode and no lower than 4 ohm in bridged mode.

Hope this helps

Mar 25, 2009 | Legend LA1490 - American Legacy Series 2 -...

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500/1- Low ohm light

Disconnect the speaker wires from the amplifier's terminal block. If the low ohm light still comes on with no speaker wires connected, the amplifier will need to be repaired.

If the light no longer comes on, check the speakers and the wiring.

Jul 15, 2008 | Jl Audio 500/1 Car Audio Amplifier

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JL audio Low ohms indication

If the low impedance light is coming on, you may have shorted wiring or a defective speaker. Disconnect all of the speaker wires from the amp. If the light does not come on, reconnect one speaker at a time to see if you can find the one causing the problem. If the first one you connect causes the problem try a second one. If the light comes on with no speakers connected to the amplifier, the amplifier is in need of repair.

Oct 05, 2007 | Jl Audio 300/4 Car Audio Amplifier

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