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Amp i have a kam kxr150 amp but only one of the channels is working properly (channel a)channel B only has very slight sound coming off it even if the volume is turned up

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Re: amp

Possible final i.c. very weak check voltages on both channels see if big diffences

Posted on Sep 16, 2007

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I have the xp 300 and in stereo mode it only works on one channel or the other, not as 2 seperate channels

If you are saying that it only works on say the left channel in stereo mode, but both channels come on in mono, then there's a fault in the amplifier's pre-amp. These days they are an IC, it can be traced by following the input wires to the point on the PC Board and then looking around for an IC with all inputs going in. If you are lucky there might be two! One for each channel. Replace the one on the dead channel. You can test it, either the single IC or both, touching it's pins with an insulated tool while the amp is on. It will buzz on the channel. Stereo amps have two sets of identical parts, except when an IC is involved. But even then that will have two halves (inside it). You just need to touch the pins of the IC, with the tool, but don't short the pins together! You should hear at least 4 buzzers. One at the right input, one at the left input, one each at the left and right output. If you only get the left an right output buzz, plus the good channel input buzz, you know it's the IC that's gone.

Mar 29, 2011 | Gem Sound GemSound PA-585 2-Channel...

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Volume at 10 produces very low speaker output.!?

It sounds to me that all you are getting is the pre-amp stage of the amp and nothing from the power amp stage. As it is on both channels then it is something that is common to both. This could be something to do with the power supply of the power stage. Or whatever is on the heatsink. It could be that the amp uses a single audio amp IC for both channels. If it does my bet is that it's gone. If it uses two sets of semiconductors for the right & left channel it would be highly unlikely that both channels have gone, but not impossible.

Dec 27, 2009 | Amplifiers & Preamps

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Purchased 2 used sonance sonamp 260 for homewide speaker system (12 pair).line out from receiver into first amp powering first 8 pair.line out from first amp into second amp powers remaining 4pair.only...

I am assuming you are using the standard sonamp 260 not a 260x3
and that when you say you are getting sound on only 1 pair that means only on 1 side (left or right channel only?)

Are using a speaker selector box? you must to regulate the resistance (ohms)

if so first unhook all but on pair of speakers and see if both channels are working.

if they do your problem is in the speaker selector not the amp if no then check to see what the amp level is set to. These are the two small holes on the front right of amp make sure they are set about equal at around half way up.

If that doesn't work flip the RCA cables coming to the amp perhaps you have a bad cable if that doesn't work make sure your receiver (source) is outputing a stereo signal to begin with.

lastly 8 sets of speakers off 1 amp? that's pushing it.even with a high quality Niles or speakercraft selector that controls the resistance going to an amp I wouldn't go past 5 sets.

The right way to do it would be to use 260x3 or a sonance or speakercraft 12 channel amp.

Nov 04, 2009 | Sonance Sonamp 260 MKII 2-Channel...

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Does anyone has overheat problem with Behrigher EP2500 power amplifier? We had the amp for abut a year. The amp. has recently become overheat (hand burning) after 30 minutes operation. We set the gain to...

The last time I had a problem like this there was a defective transistor in the from end that was generating noise in the 30K range. Too high to hear and too high for the speakers to reproduce, but enough to put quite a load on the amp. Does this occur even with no speakers attached? If so, then put an osciloscope on the outputs and look for signals. WIth no input, there should be no output at all except for a little noise. You can also see if there is any DC on the outputs as well.

Please update this with what you find.


Oct 13, 2009 | Behringer EUROPOWER EP2500 Amplifier

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Drop out of left channel, Adcom GFA5802

It sounds as if there is a broken solder joint somewhere that slowly opens up with heat. The other possibility is that an input or driver transistor is dying. Since the whole channel is dying, I would guess the broken joint and/or dying transistor are near the very input of the channel.
A tech can very easily find the spot by playing the amp until it starts to die, then spraying small bursts of freeze spray, one component or area at a time, until the amp suddenly comes back to life.

Aug 13, 2008 | Adcom GFA-5802 2-Channel Amplifier

1 Answer

Sound through one channel

Only the right channel had a sound,the left channel is mute, whatever adjustment you did and whatever balancing you done nothigs happen,even you interchange the speakers. The problem is in the power amp. The STK IC there is busted already, it's better to change it with a new one so the performance become normal again.

Jun 14, 2008 | NAD C372 Amplifier

1 Answer

Problem with philips Powerhouse AW626 music System

try to invert your speakers cables and connect your right speaker cable to left output if the problem still happened you will have a problem in your amp and ask for help from good service center near you-------if the problem disappear you will have a problem in left channel----cable or speaker.

Jun 03, 2008 | Amplifiers & Preamps

1 Answer

Gem Sound XP-350 both channels failed

Speaker fuses are generally fast-blow styles 250 volt glass
If an amp shuts down, with speakers connected, it sounds like one of the power supply lines does NOT like what it's "seeing" . Probably output transistors bad ( or module)

Take it to a tech.

Scott out.

Dec 02, 2007 | NAD C350 2-Channel Amplifier

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