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Ampeg b5r rack head squeals with low frequencies. when i wiggle the internal cable to the speaker out i preforms fine until i travel with it. plugging into an ampeg svt 610hlf classic

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Sounds like you have a loose connection. Try re-soldering the
internal connection. and check the wire for breaks. it may be the cause of your intermittence. Good Luck!!

Posted on Jun 19, 2015

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I have a Behringer nu4-6000 amp that I am trying to connect Peavey 215 speakers (2-1/4 inputs). How do you connect the 4-pole cable that is bi-amping from d Behringer speakon, 1/4 only uses 2 cables.


I can't give you a definite answer but I suspect the Peavey speakers with their four wires require a different sort of amplifier.to the conventional type.

You will be aware in lots of speaker enclosures are one or two drive units and a tweeter. Ensuring the right frequency of signal goes to the right speaker will be a filter or crossover which is also housed in the enclosure. This has been the common way to deliver a good sound forever.

There has been a fashion for delivering a good sound differently by placing the filter network or crossover in the pre-amp stages and then delivering the different frequency signals to two, three or more power amplifiers, each one designed to amplify a particular frequency range and in this way fewer compromises are made to the purity of the resulting sound. Each amplifier would have an output through a pair of wires destined for the drive unit is was designed for.

Two and three rack amplifiers have been a very popular way of delivering sound in cinemas, in particular a powerful bass. I haven't personally been involved with such an amplifier but I remember the magazine Wireless World publishing a series of articles about the system and the instructions for building one.

These are just my thoughts on the matter and your next step would be to examine the internal wiring of your speakers to be sure.

Mar 13, 2016 | Behringer Music

1 Answer

Crate amp very low volume


Effects loops plug sockets get dirty and cause the sound to not get through to the actual power amp. Check those by plugging in a cable and wiggling to see. It needs to be wiggled and unplugged to see. Also, check for dirty volume control.

Feb 17, 2013 | Music

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I have a marshall mg100hdfx head. it was working fine and I turned it on it started screaming like feedback at full volume. it does this with all volume at zero and without anything plugged in the inp


This could be many things and unless you are electronically adept it is unlikely you can DIY the repair... HOWEVER I want you to try one thing first: Sometimes the contacts on the switches of the Effects send and return go bad leaving the input to the power amp section floating and it can feedback. To test this, plug an INSTRUMENT cable between the send and return effects jacks on the back. This bypasses the contacts, If the amp behaves, you could run it this way getting a short cable or have the amp worked on at a shop to replace the jack. The jacks are really rather poor quality on musical amps in general.

May 13, 2012 | Marshall MG100HDFX 100-Watt Amplifier Head

1 Answer

Ampeg BA600 115 combo power cuts in and out!


Broken cable jacks are most common problem. Cracked circuit boards and bad soldering is second on the list.

Jul 14, 2011 | Ampeg BA600 115 1 x 15 Bass Combo

1 Answer

I use an SVT450H with the SVT410E and the SVT15E both 8 ohm Ampeg cabs. I have to have the main gain on 5 to 6 and the master volume on 7 to 8 and that is in smaller venues. I use a 1964 Fender Jazz Bass...


Check to see the phasing of the two cabinets and the cable. Take a 9 volt battery and touch it to the end of a cable that is plugged into the cabinet. The + of the battery has to be on the tip, and the - to the sleeve. See If the speakers move outward. Check each cabinet if they do then they ae in phase. Now try it with the second cable the results should be the same. If not and they move in the opposite direction then that cable is wired wrong. If one of the cabinets move in the opposite direction than the cabinet is wired wrong. You can also run one cabinet at a time if they sound louder by them selves that should also tell you that something is out of phase.

Jun 17, 2011 | Ampeg SVT 450H Classic Series Solid state...

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Brand New Ampeg Ba 600 210. Only Used durin 2 shows. Sound is awesome. Go to use it this weekend and absolutely no sound at all coming through the speakers. Compression, eq and Everything else working when...


Another person posting on here I suggested opening his unit and he had blown speakers. I think these that are DOA after previous use may be blown during the previous shutdown of the amp driving them and those with built in amps are blown when mixer is powered down putting out a large pulse. Hopefull the amp is blown rather than the speakers... cheaper to repair. Open and check for a fuse, but dont' replace it until you find out the cause of it blowing as additional damage can occur.

May 15, 2011 | Ampeg BA600-210 Bass Combo (with )

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Hello I have a SVT410HLF ... I am getting a very low crackle from the cab . I have checked my head with another cab and it is fine


This is either caused by something in or on the cabinet vibrating... grilles and logos are common problems OR one of the speakers is blown OR you have contamination behind the grille. If you have driven the speaker too hard, the voice coil can distort from heat and rub the magnet pole pieces. You can tell this by removing the grille and GENTLY moving the cone back and forth. If you can feel any roughness, you need to have speake re-coned.

May 04, 2011 | Ampeg Svt-410hlf (4x10" 500w Svt Bass Cab)

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All the inputs on my ampeg bass amp are not working even the RCA input is not working. the amp still turns on


If none of the inputs work, then you may have lost part of the power supply. DO NOT go into this amp under any circumstances !!!!...there is enough voltage in here to kill you crispy !! I would strongly recommend that you take it to a respected repair shop that specializes in guitar amps. Possibly visit the ampeg website for an authorized repair center. It might cost a few bucks, but the Ampeg is highly sought after by musicians everywhere !!!....thanks... Rob

Sep 01, 2010 | Ampeg Classic Series Svtvr 300watt Tube...

1 Answer

Marshall MG50 DFX makes a squealing noise on power up


Yep, chalk that one up to poor design...The amplifiers are going out of balance during power up and down. Two seconds is pretty long... Try turning down the gain during power on and see if that affects it.

The pop on turning off is normal... None of these have speaker disconnecting hardware that is necessary for very high power amps. The biggies have hardware that checks amplifier is balanced before connecting the speakers and a relay also cuts the speakers immediatley on power down. As power goes up and down the circuitry comes to equilibrium and until it does, strange things happen.

I would investigate the CONDITION of the filter caps for the main power because if they age to a higher internal resistance that COULD cause the high freq oscillation on power up... Two seconds is MUCH too long.

There should also be some non-electrolytic caps NEAR the power output transistors to handle high frequency supply power bypassing.

Check the power bypasses that service the preamp stages. Look for pregnant electrolytic caps that have failed.

Ultimately, you MAY need an oscilloscope to isolate the high freq problem.

Jan 03, 2010 | Marshall Music

3 Answers

Marshall mg100hdfx loud fuzz and distortion and no guitar sound


Check your input (guitar signal).
Also, check your gain and volume levels.
Make sure that you have a reliable, steady, and clean power source as well.
If the problem persists, contact the store from which it was purchased. There are a lot of things that can go wrong internally with the cheaper Marshall models.

Jun 25, 2009 | Marshall MG100HDFX 100-Watt Amplifier Head

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