Question about Behringer Bx4500h Ultrabass 450w Bass Amplifier

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The Amp doesn't come one. it shutdown after it was used.

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There are three entries for this same device. If you have overposted these, the symptoms combining the three would indicate that one of the power amps has probably shorted and overloading the power supply till a fuse has blown DO NOT replace the fuse till unit is repaired.

This is not a do it yourself repair unless you are competent in electronic repair.

High power amps are easily damaged by intermittent speaker lead connections and shorts as well as overdriving them into too low a speaker impedance.

Posted on Jul 13, 2010

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1 Answer

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Either way will work, however your friend's method probably would be slightly better since it goes through less stages within the PMP2000. The "left and right power amp inputs" are the INPUTS to the power amp in the PMP2000 and hence are the best places to connect the mixer if using the PMP2000 as only a power amp. Note doing this will LIKELY disconnect any other input to the PMP2000 from the power amps in it... that is all the preamps in the PMP2000. DO USE TRS cables!!! and power both units from the same receptacle to avoid ground bounce.

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I got my KM60 in Singapore where they use 240V. I moved back to the states and now when I turn it on the amp buzzes for a few seconds and then it has a faint static while it is on. This static...


The only change you need to make for the 120 operation should be to change the fuse to a 2 amp fuse. Faint static is typical of the electronic noise of amps... as long as it it is faint. The power supply will act differently on 120 than 240... probably takes a brief more time to get the system stable, hence the initial buzzing. As long as it performs don't worry about it.

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I have a Fender Frontman 15R. It doesn't work at all. No sound. I read reviews about it and none say that it does this. Is it worth fixing and what might be the common problem? Thanks, Aileen


The power amp chip has probably blown. It is a TDA2050 cost about $3. They don't even use thermal grease on these to help conduction to heat sink. Make sure you do use thermal grease when replacing. Also be careful of pluggin anything OTHER than headphones in the headphone jack. It can result in blowing the amp chip.

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We laid down 5 tracks of a new song and listened to them. We then changed screens to open another project (song) and the song we wanted to open (all 24 tracks) is GONE!! The other 21 songs on the machine...


Somehow proper save and shutdown was not done. You said the magic word PANIC... That is a deadly word in this situation. So first thing like for lost files on a PC is to look around... carefully. LIKELY the files are still there, just under a different folder or imbeded in another project. These systems do a pretty good job of not letting one clobber their files without confirming AS LONG AS proper shutdown procedure is used or power doesn't fail. The five tracks you might have forgotten to save...but the other should be there.

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I have two Behringer Eurolive B415DSP speaker, one of them stopped working out of no where. To my best knowledge, the problem is that it doesn't turn on. I had the Fuse check already and thats not the...


This is alimentation fault of the amplifier inside the box. Dismount the amplifier block and take a look first if there are some burned pieces. If it seems all ok, better bring it to a electronics/ tv service center.

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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.

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FM 65R plays and sounds great for about 5- 10 minutes then it sounds weak and distorted. If I play directly into the power amp input it sounds great again just no control for the volume and tone.


Also the volume will probably be lower going into the line level PA input... If the amp is shutting down for thermal reasons, driving it less might not get to the point of shutdown. The schematic shows a temp sensor that reduces and shuts down the amp if the heatsinks get to hot. Possibly you are driving the amp harder than it is intended, If it is as loud (I doubt it) driving the PA input, then I would expect it to shutdown, but you would probably have to drive it harder than your guitar because guitar levels are well below line level. The amp claims 65 watts... don't believe everything you read in spec sheets... You should be able to generate 100 Db of sound with it... The more distortion you use will drive the amp harder and heat the heatsinks faster.

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Orange TT. cuts out on high gain on both channels, what can be the problem?


You MAY be exceeding the capability of the unit causing the thermal protect of the PA chip to shutdown. A 15 Watt amp is NOT going to make a lot of noise unless you have super-efficient speakers that are say 15 inch ones in decent cabinets. You still will be limited in sound level. Just because the gain control goes to a paticular number doesn't mean the amp can take it !!! Mpost of these use 7 terminal amp chips about the size of a TO220 transistor. Heat sinks are OFTEN very inadequate.

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1 Answer

Mg15dfx Amp issue


Most of these use an amplifier chip in the TDA family of 5 or 7 pin audio amps.

If you play real loud you may overheat the chip and it will go into shutdown to protect the chip.

Sometimes htey don't put adequate thermal conductive grease on the chip causing it to overheat.

Remember this is a small practice amp, not a powerhouse.

It sounds like it is going into "motorboating" as it is called.

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