IBM-380XD LF sound, hardware hacker needed

[Garst R. Reese]

Hi folks,
Has any brave soul opened up their 380XD and looked at the input circuit
on line in. I need real LF response for some amplifier testing. I
suspect I could find the input coupling capcitors and short them out,
but I somebody has tried this and either succeeded or failed, I would
like to hear about it.
Thanks, 
        Garst