I have lost output to one speaker but get both channels on headphone socket. Switching input wires has no effect but when I press mono button I get sound from both speakers.
This is only happening on Phono input everything else works ok.
Sugden A28 amplifier
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Re: loss of one channel to speaker
When you say switching input wires you mean your source? that you switch it? you only have switch problem, it is mechanical type swutch need to clean only, if still possible. i dont know if you can find replacement.
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If everything is connected correct, the only thing I can think of, is you don't put in a surround signal. If you only feed 2 way stereo, only two speaker will work. Also if you switch to stereo, the other channels will stop working. Check the cables, the settings and the input.
May not be serious,first with good channel playing move all controls and switches on the amp,Dead spots can occur on controls especially if they are rarely used.balance controls,tape monitor switches etc so work them all.If fault doesn't clear try headphones,switched sockets can cause problems.next swap input signal leads,left to right. and if still no good try swapping over speakers left to right.STILL no sound? its the amp.Time for tools and a test meter.You can look for blown fuses but its never a good idea to replace a blown fuse without testing the circuit first.may cause further damage and put up the repair cost
Depending on the model, there are two ways to connect a subwoofer to an amplifier, receiver or processor. The best way is to connect the subwoofer to the SUB OUT or LFE output of a receiver, but some subwoofers can be connected to the speaker level outputs of the receiver or amplifier.
1. How to Connect a Subwoofer to the Subwoofer Output
The preferred method of connecting a subwoofer is through the LFE or Subwoofer output (SUB OUT) of a receiver. Almost all home theater receivers (or processors) and some stereo receivers have a subwoofer output. The LFE (Low Frequency Effects) is a special output for subwoofers and is often labeled 'SUBWOOFER' not LFE. 5.1 channel programs on DVD discs have a dedicated .1 channel output with bass-only content that is best reproduced by a subwoofer. Connect the output of the LFE or Subwoofer jack to the Line In jacks of the subwoofer using a single RCA cable (the two jacks on the left in the photo). A 'Y-Cable' may be necessary to connect the LFE output to both the left and right channels of the subwoofer.
2. How to Connect a Subwoofer to Speaker Level Outputs Some receivers and amplifiers do not have an LFE or Subwoofer output. In this case you can use the speaker outputs of the receiver to connect the subwoofer. Using speaker wire, connect the left and right channel speaker outputs of the receiver to the left and right channel speaker level inputs on the subwoofer (the speaker inputs on the right side of the photo). Using speaker wire, connect the left and right channel speaker outputs on the back of the subwoofer to the left and right channel front speakers.
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.
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.
Plug microphone into a channel on mixer. Also plug in headphones and turn headphone volume control up.
Make sure input sensitivity knob is turned up a bit (say half way) and main output faders (yellow) are up.
Check that channel is turned on (little button just above the channel fader- needs to be pressed down)
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)?
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?
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.
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).
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.
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.
Make sure any mute buttons are not switched in on main outputs.
Contrary to what's posted above, the Marshall MG series does not pass the speaker power output through the headphone jack, and inserting the headphones into the jack does not disable the speaker. The headphone amp is a separate circuit and it's input is taken before the master volume. So Jan's post is exactly right. Turn off the master volume and turn up all the other gain/volumes as high as they will go. The other issue is that the headphone jack's output does not drive low efficiency headphones well, so you need some headphones similar to Sony's MDR-V700s to hear it well. Earbuds just don't cut it.
An MP3 player is a stereo device, meaning that it works on two channels - left and right. Therefore a 5.1 speaker system will only play on 2 speakers.
However, if you want to use rear speakers as well, just for the fun of it (you won't get any surround effects, both left speakers will play the left channel, and both right speakers the right channel) you can purchase a "headphone Y-adaptor", that normally allows two people to use two pairs of headphones on the same portable music device. It has one headphone plug and two headphone sockets in parallel. Plug it into the player, and to the sockets plug the front and rear speaker cables :)
try it with nothing plugged in to the inputs, if there is no noise. most likely its the turntable, cd player, or whatever the input is is the problem. or try plugging the mixer into a different area of the house/room. its like if you were to put your cell phone by a mixer, or speakers.
apply a spray contact cleaner in headphone socket(the place where you put your headphone jack)-and insert the jack in and out many times because it maybe problem inside-check your speaker cable for good condition.and firmly connected.