Question about Behringer K3000fx 300w 4-channel PA Keyboard Amplifier

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Sound is distorted at certain frequency / volume what would cause this?

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More infornation is required to provide a real answer, but I can give you a few possibilities:

1) There is a problem within the feedback loop that is allowing some frequencies through. This will be more prevelant at higher volume levels.

2) If there is a tube pre-amp section, the tube can be "microphonic". This too is generally more likely at higher volume levels.

3) Defective components in the amp section. These may pass some DC voltages that will sound like distortion.

If you can, please experiment a little to try to find when the problem is most obvious. With more details about when the problem occurs may give us enough info to determine the cause. Otherwise a trip to a service shop that has access to test equipment will be required.

Dan

Posted on May 21, 2011

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Is the problem noticed at low frequencies only? If so, a rubbing speaker might be the cause.

Posted on Dec 07, 2014

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1 Answer

I have a peavey renown 400 while playing bar chords at 3 to 4 on volume amp will get loud and distorted on its own never shuts off though. but only happens bar chords 7th fret and above.mind baffling


Could be a few things, most simple the Tubes, and or biasing, I have had a few amps that certain notes or chords would cause harmonic distortion within the tubes, and the tubes where good? Another possibility is the output transformer? Sometimes when they are failing the volume varies... hope this helps?

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Marshall MB4410, with low volume gives no real volume,


Guitar amps have preamp sections (think unpowered audio mixer) and power amp sections (Crown rack-mount amp). An excellent way to isolate audio problems if amp is still producing audio is to check the preamp out (line out). Preamp output distorted = preamp failure. Connect MP3 player to "Power Amp In"...sound distorted = power amp failure. In your case the latter is the case as your "line out" is clean. Also test each speaker for clear sound as speaker cone damage from being overpowered is fairly common. At 300w. I'll assume the failure was not from cranking the volume to loud but a shorted speaker or speaker wiring could zap the power amp in an instant.

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I have a TNT 115 S that is distorting when i play E string on my bass. What might be causing that?


Please add more information to improve help, does the amp just distorts in that particular note or teh entire sound is distorted? does the amp distorts at low volumes?

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Hello i have just bought a new fender 212r amp and i have gigged with it for around a month now. I have noticed that the amp keeps cutting out towards the end of the second set which never ever...


Numbers on volume controls mean very little as there are too many things that affect the level. If you are really driving it hard you may be causing the amp to go into thermal limiting. This is a 100 watt amp so there is a limit. The sound level from it probably can easily exceed legal limits. You should get and use a sound meter. If the amp can create 100 Db that is all you need. If you stay in that environment over a few hours, you are a candidate for hearing aids in the future. I know several musicians that are in this condition and now are wrecked. Remember that loud does not equate to QUALITY... Your group should have a sound level meter and with that you can tell if the amp is performing as it should. One thing to be careful of is high frequency feedback, even that above what you can hear that heats up the amp with frequency output you are not using. Make sure your guitar cannot "Hear" the amp. Also be careful of boosting the high frequencies. Also be careful of large bass pulses that you can see drives the speaker cones to the limit. If the cones move too far, the voice coil leaves the active magnetic area causing excess current and amp heating. Make sure there is free airflow around the amp and especially the heat sinks.

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I have a jackson dinky DK2. what is happening is that on certain frets, like the 13th, 14th, 15th fret on the 2nd string (B string),when playing with slight drive or distortion, the note does not sound...


The frets MAY be worn or the neck truss rod MAY need adjustment, Neither of these is DIY unless yiu have experience in repoairing guitars. Since this is only on the 2nd string, inspect the frets for wear and the only DIY thing to try is to replace that string... DO that first !!!

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I just got this bass and am getting speaker pop at low frequencies, any ideas of what is causing this? All other frequencies sound great.


If you are driving the speaker too hard it will pop. This caused when the voice coil is driven mostly beyond the pole pieces of the magnet. Without the magnetic field the back EMF of the voice coil drops off and the current shoots up. The voice coil can't move farther so there is a discontinuity of movement which causes a pop.

200 watts is a lot to put into a 12 inch speaker so you have to be careful to not drive low frequencies at excessive volume. It is both very hard on the amp and doesn't do the speaker any good either.

If you want loud lows, you should get a subwoofer of at least 15 inch speaker to handle the lows.

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1 Answer

When playing notes on the A string I get a crackeling noise


Just a thought:

If you used the speakers with another amp and they still make noise when you play certain frequencies, then it is obviously a problem with the speakers or the cabinet - it could be a mechanical resonance in some part of a speaker / cabinet, something like a loose screw or a nut, loose protection mesh on the speakers that resonates at certain frequencies, possibly a bad speaker or a speaker membrane...

Also, you might want to check the pickups on your guitar, see if the pickup core slug under the A string is much closer to the string than the other slugs so it is either picking up too much signal and distorting it or the string might be touching the slug when you play it and cause noise, also see if the string is touching something else when it vibrates...

good luck

3rq8 (Triarcuate)

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Turned on the Privia PX-575R and sound distorted, seems as if bender is in use intermittantly when noone is touching it- and almost like speakers are blown, but volume was never set very high.


You should probably check the bender controller and the master volume potentiometer, they might be dirty / oxydized, in such case, you need to either disassemble and clean them or replace them.

Also check for bad solder contacts on wires, connector pins and any of the components (e.g. voltage regulators, capacitors and/or other components).

Check all connectors for any dirt / oxydation on the pins and clean them if necessary.

Also check the main power switch (dirty contacts may result in erratic behaviour of the unit), and, if we're talking onboard speakers, see if the speaker protection mesh is somewhat loose, it may vibrate and cause the speakers to have dirty / distorted sound (you need to fix the mesh firmly in place to stop it from vibrating).

It could alse be a problem elsewhere in the unit (a bad resistor or capacitor, possibly some other component), these are just some of the things that may cause the unit to have dirty sound.

Hope you can make it sound well again.

regards

3rq8 (Triarcuate)

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2 Answers

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