I run a peavey pv2600 power amp. It has been running fine until about a month ago when i added another pv900 amp to lighten the load on the bigger amp.
Now very quickly after the amp has been turned on the red lights on the front both light up simultaneously with very little input. If we turn the amp down and the mixer up this works (although i know its not a good idea).
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Re: Peavey 2600 Low input = Complete Cutout
I'm not quite sure of how the two amps are interacting here, so I'd like to request that you describe the entire hookup. Sending a higher signal from the mixer should not be a problem, but something is wrong in the setup (I think).
Please update this with a description of how you have the mixer and amps connected to the speakers.
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This will depend on your Subs. If they have an inbuilt crossover there will be input and outputs on the rear, with the output marked something like 'tops' or 'Output to HF'
If you have these then it should be a simple matter of connecting yout amp to the subs and then the mains to the output.
If you haven't got a crossover in the subs then you will either need to buy a pair of two way crossovers for the right power and frequency and have these in the speaker wiring or use the amp's inbuilt crossover and run one channel for tops and the other for subs. You will lose stereo but the amp will happily drive a 2ohm load so you should still be able to use all four speakers.
Sounds like the thermal cutout is sensing over temp. Make sure there is FREE airflow around the unit. If it is in a cabinet, install vent fan(s). This amp will throw out a lot of heat. Make sure cooling fins have airflow. Cables can block the airflow... check for that possibility. Repeated thermal cycles will eventually cause failure of components.
In case you don't have one, here is a link to the manual:http://www.peavey.com/assets/literature/manuals/80300573.pdf I don't know if you are using a separate crossover between the mixer and the amp but here is the simplest explanation.I just reread your question and I don't even know whether you have a Peavey amp. Run proper cables from the main output of your mixer to the main inputs of your power amp.They will be 1/4"shielded cables or Balanced XLR cables. Do not use unshielded speaker cables to hook the mixer and the amp together.Run speaker cables from the speaker outputs of the amp to the input jacks of your speakers.Make sure the impedance of your speaker cabinets equals or exceeds the impedance rating marked on your amp. Here is the link to the newer model PV2600 manual:http://www.sweetwater.com/store/media/pv2600_doc_manual.pdf Don't use Speakon cables unless your speaker cabinets are equipped with Speakon input jacks. Banana plugs aren't as solid a connection as the binding posts are.
you can run one amp from the main out puts and the second amp from the CTRL Room out puts. The CTRL ROOM are outputs that are linked to the same bus as the master fader. This will work fine...
Best of luck
Chances are you have NOT got all the bad parts out yet.
HINT: While cold starting an amp after it smoked, put a 150 wat lamp in series with the power cord to act as a current limiter... saves fuses and parts.
The DDT circuits PROBABLY look for amplifier DC balance AND no overload of power supply as protection.
They COMPRESS the audio when it goes above a certain level.
SO, to troubleshoot this you will probably need an oscilloscope.
LOOK for a supersonic oscillation that you cannot hear but MAY be driving the amps beyond the DDT trip point. Drive a pure low level sine wave into the amp and follow it through to see at what point the DDT compressor senses an out of range level.
Remember it HAS worked before, and there is still a bad part in the unit. DO use my suggestion to limit the current as often while troubleshooting this type problem, the signal will suddenly go to a point to fry something, then you get to replace all the parts AGAIN.
I've worked on similar units. Things I'd check first : Dust in the unit. Weak solder connections /crusty debris stuff on the input jacks or output terminals Any flex cables soldered in tend to be a problem on peavey amps I resolder all those contacts. Checking the amp w/o a load IS NOT a good suggestion. What style output connections are you using? 1/4 inch, binding post, or Neutrik style?