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Jan lek Posted on Jan 06, 2021
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K450FX. Why does second channel have low signal output?

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Brad Brown

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  • Behringer Master 19,187 Answers
  • Posted on Jan 06, 2021
Brad Brown
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There is a problem with the internal circuitry. There may be one of more components that have failed or weakened.

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tip

How to Set up Auxiliaries on a Mixer.

Here are some tips to set up the auxiliaries properly on your mixer:
  • Step1:
Your auxiliaries allow you to send the signal from a channel strip to somewhere else while maintaining the signal on the channel strip. For instance, you can use auxiliaries for monitor mixes for performers in a live environment. You can also use auxiliaries for external effects processors or a number of different situations.
  • Step2:
Set the auxiliaries to pre-fader to allow you to change the level for the auxiliary with the auxiliary knob but not with the channel fader. Most mixers have a "Pre" button that allows you to enable pre-fader mode. If you don't have the button pressed, your auxiliaries are in post-fader mode, which means your channel fader will affect the signal level of the auxiliary output. For monitor mixes, you usually want to use pre-fader so you can control monitor mixes independently from the front of house mix. Some effects processors will be better to run post-fader, though, so don't always rely on pre-fader.
  • Step3:
Send out your auxiliary sends. On the back of your board, you there are the auxiliary outputs. For a monitor mix, you will use these outputs to connect to the inputs of the monitors. When using an effects processor, you will use the auxiliary output to connect to the input of the effects processor.
  • Step4:
Plug in a return if necessary. If you are just doing monitors, you do not need returns to the mixer. When using effects processors though, you need a way to get your effected signal back to your mixer. Take the output of the effects processor and connect that to the return input on the back of the mixer. Now you will have to adjust the return section on your channel strip to get the desired signal.
  • Step5:
Use the auxiliary knob to set the desired level. Once you know if you are running pre- or post-fader, and you have your inputs and outputs all correct, you can start sending signal to your auxiliary output. Turn up the auxiliary knob until either your monitors are set correctly or until you have the desired amount of signal going to your effects processor or other outboard equipment.
0helpful
1answer

Why does my mackie cfx12 mkii have low output across all 8 xlr inputs at unity gain with distortion above that?

Where are you getting the low output? It would be very strange if all channels failed in the same way so it is probably something common to them all. Can you get the clip light to illuminate at all by turning the gain up on a mic channel and shouting into the mic? You are referring to the gain at the top of the strip not the slider aren't you? What happens if you assign a channel to the other sub channel, does the level come up through that? What happens if you take the output from the aux send and you send signal there, is it the same issue?
I may be completely wrong but I suspect if it is only mics that are causing a problem you may have the routing set up wrong or not set a level somewhere else right.
1helpful
1answer

No sound

There can be any number of reasons for this problem - solve it diagnostically by starting with something that you know is working and work through systematically to the other end.
  1. Test a microphone on a separate amp to make sure it works okay. Check amp and speakers working. Check that all output cables from mixer to amp are working by testing separately.
  2. Plug microphone into a channel on mixer. Also plug in headphones and turn headphone volume control up.
  3. Make sure input sensitivity knob is turned up a bit (say half way) and main output faders (yellow) are up.
  4. Check that channel is turned on (little button just above the channel fader- needs to be pressed down)
  5. press pfl (pre-fade listen) button (next to button to switch channel on)- do you get any sound on main output or headphones or any indicator lights on mixer to show signal is getting that far (eitehr the individual channel metering lights or the main ones in the central section)?
  6. turn off pfl - make sure channel fader (slider) is up - normal position is ) - about 3/4 of way up. Check lights again on individual channel and main output section - any signs?
  7. Is the sub mix button for the channel pressed down - in which case you will need to bring sub mix (red) output faders up as well as main faders.
  8. If you have got signs of signal on the individual channel but not main see if the channel has been routed somewhere odd (like a subgroup of channels).
  9. Plug a working amp and speakers into one of the auxiliary outputs and use the relevant auxiliary send knob (on each channel just above the faders and pfl switches) to pan some signal to that auxiliary out - do you get anything? There is also a headphone socket for listening to the auxiliary channels (with a selector switch /knob to determine which one - make sure it is in the right position) try listening to the auxiliary output with headphones - anything? If yes the problem lies in the main output section.
  10. Check that there is not a jack plug in the insert socket (to route signal through an external effects unit) without a matching return jack being plugged in - if appropriate is relevant effects unit switched on and correctly set up - if unsure remove the insert plug to take it out of the system.
  11. Make sure any mute buttons are not switched in on main outputs.
You can download a full user manual here http://www.allen-heath.com/gl/gl2400
0helpful
1answer

I would like to know I have 2 subwoofer with amp how can I connect it the best way thank you

first, you will need a passive crossover, i do not believe that the mono out of the mixer has a crossover., if the amp does not have a crossover. you could use the "mono" output, and split the signal, with an adapter, to both channels of the crossover, then run both of the low outs to the 2 channels of the amp. or, you could hook the crossover to the main laft and right outputs of the board. send the 2 low outs, left and right, to the subs' amp, and send the two high outs, left and right, to the main speakers' amp.
0helpful
1answer

I've lost both channels. if you plug into the amp and turn it way up you can hear a very low output on both channels

Hard to say what device you have. Peavey makes a lot of things.

If this happened to be a peavey amp that has effects send/receive, a bad "send" jack could cause the problem due to the integral switch that sends the signal to the power amp.
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0helpful
1answer

No output on any channel led lights up

Check power supply first. Look for cables that might have become disconnected.

I assume you know how to unmute the channels. You also need to select the channels to go to the L-R by depressing the switches at each channel..

Suggest you download the manual if you don't have one and refer to the signal flow diagram. You can do a lot of external testing and see what switches need to be set to pass signals.

SOME cables are TRS types for balanced signals, including the mains output.
0helpful
1answer

Ch. 10 does not work - Mackie 1604-VLZ PRO

Yes, the ribbon cable is the 1st thing I would check. You can check the ribbon like this: Disconnect said cable from the channels. Connect cable connector from a known good channel to the problem channel. If channel sounds the same trace a signal through the channel op-amps.
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