Question about 3Com SuperStack II advanced RPS (662705388786) 100-Watt Power Supply

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Bass amp power's on but blows speakers

When i turn on mr amp it blows the speakers like it putting out a DC current what should I do

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There is a problem with your power cicuit board that causes high current to pass throught to the speaker's PC Board circuits. Ask a technician to troubleshoot the PCB circuit for defective components.

Posted on Nov 13, 2008

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SX BA1565 amplifier - loud hum when powering up. No amplifying function with an input - hum all the way!


Power amp chip or transistor has shorted to one of the power supply rails. Do not use until repaired as it is likely driving high DC current into the speaker.

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Loud humming buzz when I turn it on


Failure, likely in the power amp causing overloading of the power supply and dragging one power voltage into the range where the ripple voltage gets to the speaker. This is very ******* the speaker as it gets high DC current and can burn the voice coil. Slight chance that a filter capacitor has failed. In either case repair is needed.

Aug 11, 2011 | Ampeg BA115 1x15' Bass Combo Amplifier

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I have two sp2 speakers i am using a ipod numark dj machine connected through my 2600 watt peavey amp it keeps blowing out one speaker can you tell me why


The SP2 speakers are rated at 1000 watts PROGRAM which is around 500 watts RMS MAXIMUM. You should be using an amp capable of a maximum of 500 watts a side... Your amp is WAY too big. You will have to throttle it down. The speakers have the protection for the tweeters but NOT for the woofers. At five hundred watts RMS and 8 ohms the current is: P = I^2 * R so I^2 = 500/8 = 62.5 so MAX current is 7.9 amps. I recommend you put a 8 amp FAST BLOW fuse in the speaker leads. If the fuse blows, you have saved another speaker and you are DRIVING them too hard. For greater safety make the fuse a 7.5 amp fast blow. Also get a sound meter. The max on these speakers is 125 Db at a meter distance... and in your venue you should NOT exceed 100 Db to be safe with the OSHA regulations regarding hearing protection... I suspect you are driving the speakers too hard. One side may be getting more bass. The speakers are rated down to 55 Hz. DO NOT boost bass up as you will overheat the speakers. If you are using microphones, be careful of feedback, especially that above hearing range. If you need real low bass, then get an 18 inch subwoofer. No matter, stay within safe sound levels to avoid lawsuits and hearing loss... I know several deaf musicians...

Jul 07, 2011 | Music

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Serial number 00-06778552, a gig amp manufactured about 1977/78, (used in an American tour in 1978). While running a practice session at low volume, the yellow DDT light blanked altogether (this has been...


The amp has a failure. One side of the power amp is starting to draw excessive current to the point that the filter caps can't sustain the current so the ripple starts to be heard in the speaker. Continued use MAY burn up the speaker by sending DC through it as well as causing additional damage to circuit boards, etc..

May 25, 2011 | Peavey Max 115 1x15 Bass Combo Amplifier,...

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Hi ther the fuse has blown on the speaker out circet on my new amp any ideas why this would happen?


The fuse blew because of excess current. The cause of the excess current is either excess volume, a short in the speaker, OR the amp has failed and is shorted to one of the power rails internally and is driving DC current out.

Replace the fuse and use a meter to check the output voltage with NO speaker connected. It should be under 1/2 volt period. If it is, then check the resistance of the speaker. The DC resistance should be a little less than the rated impedance. Otherwise if the amp is kicking out a higher voltage or blows the fuse again, have the amp repaired.

Mar 28, 2011 | Ashdown Klystron 500w Bass Amp Head

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No sound from tweeter bx5a


First of all, never connect the audio from your receiver directly to the tweeter. You can blow the tweeter instantly. The mid-bass driver can be damaged from a direct connection as well.

Since you get absolutely no sound from either driver, this seems to implicate the crossover. If the crossover has opened, no signal gets through, if it has opened early in the signal path.

But, it is also possible that a short exists, and that perhaps your amp cuts off the output having sensed a short. The short could be in the crossover or one of the drivers.

Here are some troubleshooting tips--

To prevent damage to your amp, turn it off while making or breaking any connections inside the speaker boxes.

Write down which wires get connected to which place on the drivers, so you can get them back where they belong.

With your amp turned off, connect the bad speaker to your amp. You've already verified that no sound is produced when both drivers are connected.

So, with your amp off, disconnect one wire from the tweeter in the bad box.

Briefly turn your amp on and listen for sound.

If you get sound, the tweeter is shorted.

If you get no sound, with the amp off, reconnect the tweeter in the bad box and disconnect one wire from the mid-bass driver.

Briefly turn the amp on and listen before turning the amp off.

If you get sound now, but not before, the mid-bass driver is shorted.

If you got no sound either way, check the DC resistance of the mid-bass driver (only, not the tweeter. Ohmmeters put out a small DC voltage to test resistance. That DC voltage might damage a tweeter, maybe. Don't risk it). Ohm the mid-bass driver while it is not connected to the crossover. If the driver is good, you should read some ohms--a little less than the stated impedance. An 8 ohm driver might read 6.5 ohms, for instance. If you get an open or a short (with the crossover disconnected from the mid-bass driver) you have a blown driver. Two actually, since neither the tweeter nor the mid-bass driver produced any sound in the previous tests.

If you can't get ahold of an ohmmeter, try this--

Open the good, working speaker and place the two side by side.

Connect your amp to the bad speaker box only.

With your amp turned off, disconnect the wires from the mid-bass driver in the bad box and connect them to the mid-bass driver in the good box. Disconnect one of the wires from the "good" mid-bass driver first, so you don't have two crossovers connected to it at the same time--even if only one of them will get powered on. It keeps the confusion down to a minimum when trying to isolate your problem. Oh, and disconnect one wire from the bad tweeter, in case it is shorted.

Turn the amp on and listen briefly before turning the amp off.

If you got sound, the "bad" crossover is fine, but the "bad" mid-bass driver is blown. And, since you got no sound in the previous tests, the "bad" tweeter is blown, as well.

If you got no sound, try it the other way around. Meaning--

With the amp off, disconnect the speaker wires coming from your amp from the bad speaker box and connect them to the good speaker box.

Your amp is now connected only to the good speaker box.

With the amp still off, connect the mid-bass wires from the good box to the mid-bass driver in the bad box. Remember to disconnect one of the "bad" crossover wires from its own driver first, so only one crossover is connected to the "bad" mid-midbass driver. Remember to disconnect one wire from the "good" and "bad" tweeters, so the only sound you hear--if any--is from the "bad" mid-bass driver, powered by the "good" crossover.

If this produces sound, but the previous attempts failed, you have a crossover problem.

If you still get no sound, something went wrong and you need to retest the good speaker by itself and back up a few steps and try again.

Assuming you got sound from the "good" crossover while it was driving your "bad" mid-bass, make sure no wires have come loose inside the "bad" box. Assuming you have sound connections at each end of each wire, you now need to desolder the electrolytic capacitors from the circuit board.

Make sure you mark them first, so you can put them back where they belong.

You can remove only one at a time, if that helps.

Use an ohmmeter to check some components.

The big red coil should read pretty close to a short, maybe one ohm.

The capacitors should read open or infinite resistance, although you might see a steadily increasing resistance while the capacitor charges up from the ohmmeter. If you read a steady low resistance on a capacitor after it has been removed from the circuit board, that capacitor is bad and must be replaced. The markings on the capacitor should give you some clues as to the proper replacement.

All things considered, I suspect that your problem is a shorted electrolytic capacitor. But, I gave you all I could think of so you can narrow it down and isolate the problem, whatever it might be.

I hope this helps.

Feb 23, 2011 | M-Audio BX5a Speaker

1 Answer

Behringerbx4500h amp has a bad hum i here the have this problem


If the hum exists with NO input cable plugged in, this requires repair, most likely in a shop familiar with the unit.

The problem may be in the unit's power supply or a broken connection inside.

This problem can also happen if one of the oputput amp transistors shorts driving out DC current into the speaker which is a grave risk to the speaker. Check the DC out of the speaker connector. If it is NOT very near zero, say less than 0.1 volts DC, do NOT copnnect speakers..

Jul 13, 2010 | Behringer Bx4500h Ultrabass 450w Bass...

1 Answer

AMp keeps blowing fuses


When any amp blows fuses, this indicates that something is drawing too much current. The most common cause are components in the output stage and driver stages that have become defective.

On the amp that is blowing the fuse with the volume being turned up, this means that the output stage is partially working. The short or over-draw of current must be in the output stage, or what is loading it. It is possible in this case that a crossover in a speaker unit is defective, and is drawing too much current. I have seen this with especially sub-woofer crossovers, and the driver itself. Subs pull a lot of current because of the amount of drive power required to have very strong bass sounds. Other than that, this still does not rule out the possibility of the problem being defective components in the amplifier.

Jerry G.

Apr 25, 2008 | Car Audio & Video

2 Answers

Rockfordfosgate amp 750s car problem


Disconnect all speaker wires and RCA cables from the amp. Replace the fuse with a 30 amp fuse and power up the amp. If the fuse blows, the amplifier probably has shorted/leaking output transistors.

Jan 02, 2008 | Rockford Fosgate P3001 Car Audio Amplifier

1 Answer

SubWoofer


Sounds like your original and this sub have bad amps. The amp for the sub is not the same as the amp for the other speakers. The old unit has a dead amp and this new one is on the way out. (Pulling too much current on high bass)

Mar 30, 2007 | JVC TH-M505 System

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