I've never damaged any CD player or speakers. Just hit "skip track" if you hit data.
Back in times, I had a friend which regulary borrowed PCE CD games from me, just to lissen to the frantastic BGMs. Even tho I warned him about the data tracks may damage his stereo, he once must have past out while the player was in repeat mode.
Conclusion: 2x dead speakers, 1x broken amplifier.
LOL, never underestimate the power of PCE!
Now pump it up to ma..er..PCE!