On a Peavey PV-1.3K amp, can I connect 2 different signals via each input on a channel to be summed in the output of that channel or should the second input only be used to parralel the signal off?

Open it up. Look for blown or bulging capacitors.

Or

Take to Peavey Service

https://www.google.com/search?q=peavey+cs4000+service

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This depends on what you are trying to do. If you want a mono output from the amp switch it to mono mode and go into one input on the amp, this will mean the amp only works mono.

If your source is stereo you will need to use two inputs on the mixer and pan them both to the side you will be sending to the amp. This will cost you two mono inputs on the mixer though.

If you have anything stereo this is the route you will need to take but I don't see why you would want to do this as surely you'd be better running everything stereo (two channel) and panning any mono signals where you want them and leaving stereo as stereo.

Send audio from board via the "Aux1 Out" to the input of the effects unit. Now connect the output of the effects unit to "ST1" and control the amount of effects to each channel via each channels "Aux1" control. Adjust the Aux1 controls in the output stage (controls on the right side) for proper levels.

Older boards called this connection "effects send" for the output to the effect, and "effects return" for the effects out back to the board. The better choice was to use "effects send" into the effect but connect the effects output to an unused channel on the board. Using this scenario allowed EQ adjustments to be made before mixing it out to the amps and speakers.

Hello,

Check the "BRIDGE" switch position, "IN" for "BRIDGE", "OUT" for "STEREO", and clean ALL back switches with a cleaning spray and then run the amp again, also check the two green lights activation at front, if they activate, then amp is certainly working, let me know further.

You can hook'em up utilizing the front low-level main outputs of your peavey684 to your headphone amp inputs, this should do the job satisfactorily.

The Peavey CS4080HZ is intended to place 2,040 watts
per channel into four-Ohm-rated speaker
impedances. The "HZ" suffix is intended
to state the amplifier has a relatively high
impedance output and is optimized for no
lower than four-Ohm loads. Are you strapping in Bridged or Stereo Mode? Bridged Mono Operation
Both amplifier channels can be bridged together to make a very powerful single-channel monaural amplifier. Use
extreme caution when operating in the bridged mode; potentially lethal voltage may be present at the output
terminals. To bridge the amplifier, depress the rear panel Bridge switch to the IN position. Direct the signal to channel
A's input and connect the speakers across the hot outputs (the "+" binding posts) of channels A and B. Only channel
A's input attenuator is active while in Bridge Mono mode. Both connectors are strapped together, so either connector
can be used with a patch cable to drive the input of another amplifier.
Unlike the stereo mode, in which one side of each output is at ground, both sides are hot in bridged mode. Channel A's
side is the same polarity as its input with the minimum nominal load impedance being 4 ohms (equivalent to driving
both channels at 2 ohms) in bridged mode. Driving bridged loads of less than 4 ohms will activate the DDT
circuitry, resulting in a loss of power, and may also cause a thermal (overheating) overload.
Therefore, check the impedance of the cabs for each mode. Remember, if you connect two individual speakers in Parallel (+ to + and - to -) you cut the impedance in half. Two 8 ohm speakers in parallel now have a load of 4 ohms. Series connection + to - to + to -, will double the impedance. Two 8 ohm speakers will have a load of 16 ohms.
I have actually taken a two speaker cab with a 4 ohm impedance and opened up the back to re-do the wiring. I rechecked the impedance with a ohm meter. So yes, be careful. Whatever you do, keep the speaker lengths as short as possible. Buy really good speaker wire or if you make your own, go with 10 gauge wire.

Suspect that the pot is broken, or start cleaning all the back switches, this pv amps suffer from a terrible switch quality.

Make sure the Stereo/Bridge switch is out on the back of the amp. If bridged channel 2 will be disabled.

Generally speaking you should only send low frequencies to subs. The highs, while lower in power than the lows, will over time harm the voice coils. The ideal way to do this is to use an external crossover netween the main output and the amp input with the higher range going to a general set of speakers. Send the lows through the second channel of the amp and then to the subs.

In short, while not recommended, yes you can hook them up in parallel.

Dan

check for cold solder joints from the input jacks and the fader. If any look suspicious (dull or grainy) re-solder.