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Good signals to the amp, one channel has no output

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Check the bad side with a known good speaker first.If it still doesn't work most likely burned out that side. Usually a power IC chip depending on model.

Posted on May 24, 2011

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Having trouble under standing rms with speakers. Some speakers rms is per speaker and other are for both speakers.I am looking for soundstream speakers that would be 150 rms per speaker. Thanks


rms is a method of measuring power (wattage) delivered from an amp to a speaker. In almost every case, wattage capacity of speakers is quoted PER SPEAKER. Likewise wattage output is quoted per amp output channel. Assuming a you plan on a single speaker on each output channel of your amp, you should be in good shape if your speaker wattage capacity equals or exceeds your amp's output rating. I've never seen speakers rated as wattage per pair.

(rms is the dominant way of measuring average watts of an ac sine wave signal)

Apr 23, 2017 | Car Audio & Video

1 Answer

No sound from either channel


Since it is a PA amp

• Check first if input signals are getting through the amp.

• Check if all the outputs are properly connected.

If you have already done, checking..


• Check for shorted power transistors, and extract in pairs.

If it powers up, without protect..


• Check again for possible additional components before replacing

the bad ones.


A good amp never produce an over of 0.7V on its output.

Sep 06, 2012 | Technical Pro PA-2000 4-Channel Amplifier

1 Answer

Got a crown amplifier XLS 602 its powering up the relays are clicking, all voltages seems ok the signal led's are on but there's no sound output on both channels. I manage to trace the signal


Check your input or output cables might be dirty I had the same problem
and 1 of my output wire was dirty so i sprayed tha electric cleaner and its all good now
Aloha

May 21, 2012 | Crown XLS 602 2-Channel Amplifier

1 Answer

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

Feb 22, 2011 | Allen & Heath Allen and Heath GL2400-32...

1 Answer

I have this mixwer for domestic use only, swithced it on last night and power is there, but no sound at all, from any channel.Could you please advise,


Make sure your audio source is playing.

Make sure your channel is not muted.

Make sure your channel is assigned to "main mix" (bottom button to right of main volume slider).

Make sure your main output slider has volume applied.

Make sure the cable you're plugging into your "main output" is being plugged into the 1/4" or xlr output receptacle that corresponds with the slider you provided volume to.

You should then put the outgoing cable into either an eq or an amp.

If you're going to an amp first, place the cable carrying the signal from the board into an "incoming" slot on the amp. Run a cable from the output of that channel of the amp to a speaker. Turn on the amp and fade the volume knobs up. That should give you power - provided your board, cables, amp and speaker are working properly.

If you're going to an EQ first, place the cable carrying the signal fromt he board into an "incoming" slot on the eq. Then run a cable from the output of the same channel on the eq to an incoming slot on your amp. Then run an outgoing cable from the same channel on the amp to a speaker. Flip your eq on, flip your amp on, fade up the volume on the amp, and make sure you don't have a gate closed on the eq (also make sure if you have a gain knob on the eq, that it's at least partially providing power). If your board, cables, eq, amp and speaker are working properly, you will have sound.

Nov 18, 2010 | Yamaha Mg8-2fx 8-Channel Mixer with...

1 Answer

I have a B&K 507 ver 1.04 & the R front channel output has stopped working. I checked the terminals & made sure that it was in Lft Rt mode,the other terminals are working fine.


Check out the main semicondutors for that channel. You will find them on a heat sink. If you turn up the volume for that channel only and you can hear some signal getting through, then the pre-amp section should be OK. If you can't then you might have lost that, if the output devices are good.

Jan 12, 2010 | Audio Players & Recorders

2 Answers

How many watts is this amp


Specifications Power Output: 100 Watts RMS x 2 channels at 4 Ohms ≤ 1% THD+N Signal-to-Noise Ratio: 80 dBA (reference: 1 W output) Additional Power Output: 200 Watts RMS x 2 channels at 2 Ohms ≤ 1% THD+N
400 Watts RMS x 1 channel bridged at 4 Ohms ≤ 1% THD+N THD+N (Distortion): <0.25% (reference: 1 W output) Frequency Response: 20 Hz to 20 kHz (-3dB) Maximum Input Signal: 5V Maximum Sensitivity: 100mV Dimensions: 14.37 x 9.72 x 2.5 (365mm x 247mm x 63.5mm)

Jan 03, 2010 | MTX 4002 Car Audio Amplifier

1 Answer

The problem began with no signal output from Channel 1. Selecting the bypass for Channel 1 results in a signal being output. After complete disconnection & reconnection for bench test, the output for...


change your connection cables with new cables. and bring a good contact cleaner from radio shack near you and apply the spray over all your controls while you are moving them up and down.

Oct 11, 2009 | Rane GE-60 Home Equalizer

1 Answer

No stereo signal out from yamaha p 2500 s


It's unclear what type of connectors are on the end of the cables(s) coming from your computer.

This amp only works with mono 1/4" TRS and XLR connectors, not standard RCA connectors.

Did you try the Right one in the Left Channel to see if the Left Channel worked?

Refer to the following manual and read up on the connectors (page 7) and the use of the Stereo/Parallel/Bridge Switch (page 8). When it is NOT in Stereo Mode the unit only uses the Right Channel controls and input.

http://img3.musiciansfriend.com/dbase/pdf/man/m_480824.pdf

STEREO/PARALLEL/BRIDGE switch
Use this switch to select the operating mode.
• STEREO mode
Channels A and B operate independently (as with a conventional
stereo amplifier). The Channel A input goes to the Channel
A output jacks, and the Channel B input goes to the
Channel B output jacks.
• PARALLEL mode
The Channel A input signal is output through both the Channel
A and Channel B output jacks. The Channel B input jacks do
not function. Channel A and B volumes can be independently
adjusted.
• BRIDGE mode
The Channel A input signal is output from the BRIDGE output
jacks. To adjust the volume, you must use the Channel A volume
control knob.

Apr 03, 2009 | Yamaha P-2500 Amplifier

2 Answers

Behringer EP2500 no output on CHANNEL 1


check all op amps for correct voltage swing +-should be equal,test output of op amps no voltage should be present, use chasis gnd as tester neg.check voltage regulation especially 12v or 15v +-.note some amps show unequal led indications when only 1 channel connected to a load.I will try to get some more info on this specific amp because i don't know this circuit well,keep in touch as you update though.

Aug 21, 2007 | Behringer EUROPOWER EP2500 Amplifier

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