the files in this directory were hand normalized, using soundforge's 
process/volume utility, to be very close to the same loudness (db) as 
each other so that it would be easier to listen for spectral differences.

So
 - you wont hear the "quietness" of the 662a here (what did i just say above..)
 - do you hear anything else different between the 662a and 6110?  I don't...
 - load these into a sound editor, do you see any differences?
    Other than oscilator offsets, if there are any differences,
    it is so subtle that I'm not seeing them...