Question about Jensen LXA300 Car Audio Amplifier

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No sound comming from amp

I have the LAX 300. It worked well for a while now there is no sound. The protection or power indicators do not light up only the Jensen across the top. Please help....

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  • Bill Apr 01, 2009

    I was given the LXA300 from a friend, nothing lights up, not even the jensen on the top, i used a DMM and i have 12V Running through it, but no power, protect, of Jensen lights.....there is also no sound output....ideas?

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  • 218 Answers

If it only worked for about a month, then you probably did not get your speaker load right. Check that out before you repair the amp and put it back in. Good luck.

Posted on Nov 11, 2008

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Posted on Jan 02, 2017

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2 Answers

Overload light on can't get any sound


here is your guide:

http://www.fixya.com/support/t13907270-sony_str_de925_stuck_in_protect_mode

Note : output transistors are embedded inside the Hybrid IC

on some models.

Aug 07, 2012 | Technics Audio Players & Recorders

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Just bought laney rb9 bass amp, the limiter defeater LED doesnt light up when switch is in or out. how do i know if this is working or not?


Best to leave the limiter on unless you want to blow the amp and require repairs. Limiters protect the amp and also sometimes the speakers. The limiters reduce the gain when the amp reaches the maximum swing. If the gain were not reduced the amp would "flattop" which results in the circuitry saturating and massive distortion and if this condition is sustained, components can overheat or short out requiring repair. The LED MAY be just an indicator of clipping rather than an indicator of on/off. I downloaded the manual and what I have just said is CORRECT. The LED is a clipping indicator.

There is a caution regarding this amp and the sequence to turn power on. This amp does NOT have good speaker protection and you have to have the gain control down when turning on. The limiter, if you leave it on, might help protect your speakers when powering on. Most good power amps have circuitry to disconnect the speakers while amplifier is powering up and becoming stable, this one does not, so heed the warning and for certain leave the limiter ON... It just might save the amp and your speakers.

Mar 02, 2011 | Laney RB9 300 Watt Bass Head

1 Answer

Is this a good amp


I classify this as a sleeper of the car audio industry. it is powerful, well built, cheap, feature laden, sounds great! very comparible to the big names such as kicker, alpine, fosgate an all the rest. i would prefer this amp over any of them any day of the week! here are the specs for it incase u didn't have them.
  • Max. Power Output: 800W x2Ch.= 1600W @2 Ohms
  • Power Output:
    • 330W x 2Ch.(@2 Ohms) Less Than 0.5% THD
    • 220W x 2Ch.(@4 Ohms) Less Than 0.3%THD
    • Bridge: 660W x 1 Ch.(@4 Ohms) Less Than 0.5% THD
  • All Measurements Done @ 14.4V DC, 1 KHz Input Signal.
  • Dual VU-Meter
  • Dual Fan Cooling System.
  • LPF (Low Pass Filter) Variable 30Hz-250Hz
  • HPF(High Pass Filter) Variable 50Hz-l KHz.
  • Slope Adjustable 12-24dB.
  • Variable Bass Frequency(30Hz-120Hz).
  • Variable 0-18db Bass Boost.
  • High & Low Adjustable Level Input.
  • Dual LED Indicated Power Status (Protect/Power).
  • Mosfet DC-DC Switching Power Supply.
  • Built-in Protection Against Short Circuit, High Temperature & Overload.
  • Auto Power On/Oft By Remote (+12V).
  • Dimensions(mm) : 300(W) x 57(H) x 697(L)

Apr 04, 2010 | Rockwood 4224RTX Car Audio Amplifier

2 Answers

I have checked all connections to my amp battery,head unit,remote or trigger wire,fuses,power cable,rca leads,ground wire,amp has a green led light on it indicating if it works ok,red if it`s not,light...


Your amp could be in protection mode! Sometimes turning up to high or wires touching will put in protection mode! It will have to be unplugged for a day or two to drain all power out of the memory. Leave accessorie/ignition wire hooked up, just not power and ground wiring. It should reset itself.

Jan 22, 2010 | Lightning Audio B4.250.2 Car Amp

2 Answers

S series sub cuts out


this sounds like an ohm load problem do u have it bridged

Nov 01, 2009 | Alpine SWR-1222D 12" Type-R Series...

2 Answers

500.1 amp power lights blinks on and off


Protection mode; follow this link to get a manual for the amplifier: http://mobile.jlaudio.com/products_amps.php?amp_id=439

Below information is from the manual:

Status Indicator Lights / Protection Circuitry
There are three status indicator lights on the top of the amplifier. These are as follows:1) "Power" (Green): lights to indicate that the amplifier is turned on and operating normally.
2) "Thermal" (Red): lights to indicate that the amplifier has exceeded its safe operating temperature, putting the amplifier into a self-protection mode, which reduces the power output of the amplifier. The red light will shut off and the amplifier will return to normal, full-power operating mode if the heat sink temperature drops back to a safe level.
3) "Low ω" (Amber): lights to indicate that the impedance of the speaker load connected to the amplifier is lower than the optimum impedance load range for the amplifier. When this light is on, a protection circuit engages and reduces the power output of the amplifier. The amber indicator will also light when a short-circuit is detected in the speaker wiring (this can be a short between the positive and negative speaker wires or between either speaker wire and the vehicle chassis).
There is only one condition that will shut down an undamaged 500/1v2 completely… If battery voltage drops below 10 volts, the entire amplifier will shut itself off. The green "Power" indicator on the top of the amplifier will turn off when this occurs. The amplifier will turn back on when voltage climbs back above 10 volts. This may happen in a rapid cycle when bass-heavy program material causes a weak charging system to dip below 10 volts momentarily. If this is happening in your system, have your charging system inspected to make sure it is working properly.
For information on troubleshooting this amplifier, refer to Appendix E (page 21).

Jun 25, 2008 | Jl Audio E1200 Car Audio Amplifier

1 Answer

Clicking sound!


The TV is on protect mode. The clicking sound is the protection switch that keep turning the TV off to prevent further damage, this happens when a fault had been detected.

Try first leaving the TV power cord unplugged for some times, let say one hour or so.

Also ensure that the fault is not coming from a faulty receiver box sending bad signal, check if you get same problem with no receiver box or dvd connected.

If that does not work, and you keep having a flashing led on front of the TV, and tv turning off by itself after a while, that indicates a fault condition.

The flashing light indicates a diagnostic state called protection.
When the TV goes on protection there are only two possible reasons.

1The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.

2 The protection circuit detected a wrong voltage or abroken contact, identified an internal fault and kicked in , startingthe flashing light.


If you are in situation one, then theTV will reset just unplugging power cord for one or two hours,sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

Common faults that can occur are a blown capacitor on power board, a convergence IC has blown, or a fault on Digital board.

Check also the video cable or any external connection cable, if the cable is shorting, or the connector is bad, you can get same flashing state because of the video cable.


If under warranty contact the manufacturer ringing the number on the user manual

If you want to repair at your own expenses, just locate any good qualified repairer.

If you want to DIY you find parts here,

Appliance parts, electronics parts & more from PartStore.com

Encompass Parts Distribution

Electronic Replacement Parts: Plasma & LCD TVs, Appliances |

Apr 11, 2008 | RCA P60921 60" Rear Projection Television

1 Answer

No Sound/ lights flashing on Amp


Disconnect your subs from the amp. If the lights go out then your sub is blown and is putting the amp into protect. If the lights keep flashing even with the subs disconnected than the Amp is toast.

Jul 09, 2007 | Sony XM-752EQX Car Audio Amplifier

1 Answer

No power output from the amplifier...


The EEE and protect leds being on is a clear indication this AMP is toast.

Jun 24, 2007 | Ultimate Sound T3 Series 4600 Car Audio...

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