LM4780 echo/reverb on one channel. Please help

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Finaly got my LM4780 reference schematic boards installed in the case and connected to a PSU.

One channel plays fine, the other channel sounds like its comming through a tunnel and has quite a bit of reverby echoey sound artifacts...

Never encountered this error before so I am stumped as far as solveing the problem... gone over the PCB with the multimeter, and resistors seems to measure normaly etc...

Our telcoms copany dropped my dsl line a week ago, and it just went up 10 minutes ago again, so I have spend quite a bit of time on the ciruit allready.

Any help as to what the symptoms points to would be appreciated...
 
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