kENWOOD KR-9050 dc offset?

C

chameloman72

Active Member
Well...unless I have no idea what I'm doing? I checked my dc offset on my big kenny receiver and came up with 40-45mv on right channel and -11 to -14 on the left channel.:wtf: I know something isn't right cause the left side sounds stronger than the right side (more bass) on the left! NOW WHAT:confused:
 
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the + or - does not matter, its the number you are looking for, the closer to 0 either way the better, the channel with 45mv will have slightly higher THD then the other channel, but I'm not sure it would cause a noticeable difference in bass, are you sure the difference is not in the music its self? try playing some electronic techno type music where bass is more likely to be balanced between the channels.
 
AltecDarpa said:
the + or - does not matter, its the number you are looking for, the closer to 0 either way the better, the channel with 45mv will have slightly higher THD then the other channel, but I'm not sure it would cause a noticeable difference in bass, are you sure the difference is not in the music its self? try playing some electronic techno type music where bass is more likely to be balanced between the channels.
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I have tried techno, rock, jazz you name it I tried it! Even when I put the receiver in mono it still has stronger bass on the left than the right! Is it possible that my ears can hear the difference with these values? If I get the service manual and adjust the offset to bring the right side down will it make a difference? Or is there something else possibly wrong? I have deoxited the heck out of this thing and all preamp controls sound smooth with no static at all! HELP!!! I really love this receiver and want to make it perfect again!
 
are the speakers both set up the same way, ones not in a corner or closer to a wall?

I cant recommend adjusting bias, as I'm not an expert at this, but maybe EchoWars or merrylander will chime in with some wisdom.
 
AltecDarpa said:
are the speakers both set up the same way, ones not in a corner or closer to a wall?

I cant recommend adjusting bias, as I'm not an expert at this, but maybe EchoWars or merrylander will chime in with some wisdom.
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EXACTELY the same! Away from all corners and when hooked up to my other components the bass in both speakers is the same!
 
I'd wait for a more experienced member to chime in.

one thing I can add is, if the unit has a pre-out and in set of jumpers on the back you could try a separate pre-amp to rule out the pre-amp section of the receiver as the problem.
 
AltecDarpa said:
I'd wait for a more experienced member to chime in.

one thing I can add is, if the unit has a pre-out and in set of jumpers on the back you could try a separate pre-amp to rule out the pre-amp section of the receiver as the problem.
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Just did that with two seperate preamps and got the same results! It is definately weaker on the right side!
 
You've got one or more components whose value has drifted would be my guess. Test every resistor (in circuit) against it's corresponding resistor in the other channel and replace any which are the wrong value. A schematic is helpful here in identifying which resistors are which. If there are any electrolytic caps (I am not talking about power supply caps), particularly coupling caps in the signal path, replace them. An out-of-spec coupling cap will alter the rolloff frequency of the RC filter that it is a part of and could affect low frequency response.

If you have access to the schematic, an oscilloscope, a frequency generator, and a load resistor, you could pretty quickly determine if/where the dropout is occuring.
 
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