Question about Yamaha AX-596 Amplifier

2 Answers

Internal breaker? or overload protection keeps tripping.

I am running a DJ's mixing board with a CD player and Ipod connected to it through the aux input on my AX-596. The speaker A wires go into a Niles SVL-4 speaker selector and out to 4 pair of 8 ohm 100 watt rated speakers. The amp has begun switching into the standby mode after playing for 45 minutes(roughly) and more frequently after that. Is the amp overheating? Is it posible to run the mixing board through this amp? I am carefully not to push the mixing board into the red.

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  • spitkicker Oct 24, 2008

    Hi Robotek,

    The speakers are all rated 8 ohms and that is what I have the amp switched to so I believe 100 watts is the maximum output. This equipment is in my bar and has worked well for many years playing CD's through the 4 indoor speakers and 4 outdoor speakers. We only experienced this problem when we decided to try to send the DJ's equipment through our amp.

  • Jango Fixit
    Jango Fixit Apr 14, 2013



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Get the top off and identify the 2 main huge filter capacitors, 1 at the end of each heat sink.. At the base of each u will see a 47 K Ohm resistor covered in white glue extending from the cap to over the resistor's body.The resistors are numbered R141 and R142 for left and right channel respectively. Cut and strip away all the glue spilt on the resistors. For added measure replace the two 47 K Ohm resistors.
Crank up the volume and enjoy!!!
For pics illustrating the afflicted region check out my Facebook page ;

Posted on Apr 14, 2013

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Hi spitkicker

Can you tell me a but more about the circumstance you are using the Yamaha.

The speaker switch you are using also has a strict rating of 100wrms Driving it with the 145 wrms of the ax596 may damage the switcher. You also should have the protection circuitry of the Niles engaged to when using the configuration of the speakers you have.

If you are operating the amp at high levels into the speaker system(whether the mixer is red lining or not), balanced out by the SLV4 to 4 ohms, it may well be suffering from overheating, or has developed dry solder joints associated with running hot that is causing it to go into protection mode. Any amp has to work alot harder to drive a 4 ohm load, and with multiple speakers and impedance correction circuitry will be presenting a rather complex load to boot.

If you are using it in a commercial situation and running at higher output levels for extended periods, you may be better to upgrade it to a fan cooled PA style power amp that is engineered to operate under these conditions. Domestic HiFi is not built to cope with long standing high power operation and may well fail prematurely

If it is over heating, you may be able to overcome this by moving more air about the yamaha and reducing the power level you are running the system at. Happy to talk further with you about this. Let me know how you get on :) Cheers


Posted on Oct 22, 2008

  • Graeme Ross
    Graeme Ross Oct 29, 2008

    Hi again,

    Thinking that it is perhaps possible that you are running higher levels with the DJ rig, than before. Would be the most likely difference between the old and new setup. I do not suspect the DJ gear is causing the problem. Just checked the specs again, and you were right, 100rms into 8 ohms, however, the load offered by the switching unit to the amp in the configuration your are running is 4 ohms. The amp will deliver 220 ohms dynamic power into 4 ohms. You can sight the specs from the Yamaha manual here, At any rate, the AX596 is a decent HiFi stereo amp and is capable of driving loads down to 2 ohm.

    The gut feel I have is... that the amp has dry solderjoint issues that could well be heat related, hence the shut down after a "warmup period". This causing the shutdown when these dry joints cause either a thermal runnaway condition, or a DC offset to occur in the output stages. Either way, resoldering about power components output stages should resolve the issue for you. The amp IS capable of over powering the impedance matcher, although depending on the configuration, if it is a switching only device, should not be too much of an issue. Some operations of it, particularly with constant load conditions setup for using tube amplifiers may. This is not the case in your setup.



  • shadycobble Sep 25, 2011

    Robotek I have a Niles svl4 and sum how the two piece speaker connectors to this have suddenly dissappeared do you have a place where I hay be able to get new ones?



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