Sure, here's what it sounds like on the LCII in System 6.0.8, on internal and external speaker. I can hear what you're talking about now!
For the "internal" version I cranked up the volume to 7.
Actually this was a Quadra 605, but mainboards are the same.
On this board 4 of the VIA's around C137 were toast:
SPKR- feed to the TDA7052AT Amp
12V supply to the TDA7052AT Amp
VIA's that connect U30-24 to Sys_Reset
SPRK- was bodged to a trace underneath the board that was scraped away so I...
For the ProDrive ELS, I cut a small piece of black polyethylene foam about 1/8 thick and used a piece of double-sided tape to secure it. So far so good. Drive is alive again.