Can "Digital" damage my gear?

Hi Kijanki -- yes, it's certainly conceivable that a malicious download containing high power signals at 20kHz or so could burn out a tweeter, without being audible (to many of us, anyway!).

If you have concern about a particular download or cd, a way to check it would be with a good audio editing program, that would allow you to examine the waveform, and/or that would provide amplitude and power statistics. Sound Forge 9, http://www.sonycreativesoftware.com/products/soundforgefamily.asp, a professional program costing about $300, can certainly do that, and in fact it would allow you to easily filter out the low frequency stuff in the file and examine the waveform and statistics just for the high frequencies that might be harmful to the tweeter.

Perhaps its consumer-grade counterpart, Sound Forge Audio Studio ($55) can provide those capabilities also, and perhaps some of the better free programs, such as Audacity, can. I have no particular knowledge of those programs, though.

Regards,
-- Al

Keep in mind that analog circuits can malfunction in ways that result in high volumes and/or high frequencies. Something as simple as a turntable phono cable that gets partially unplugged could blow a tweeter if the volume knob on the amp is turned up. Or, one of your neighbors could get into shortwave radio as a hobby with you finding out the hard way that your cable and equipment shielding is no longer adequate.

So, yes, there are some risks in the manner you describe with digital sources. That doesn't mean that you are risk-free if you have no digital. A bit of caution deals with most situations, however.

Mlsstl - I don't expect noise/EMI pickup of full amplitude but circuit malfunction is always possible. I don't have control over that. Digital "malfunction" appears to be in addition.

Al - I wouldn't know how to start. Inspecting huge files with Sound Forge seems to be time consuming and would have to be done for every digital file. It would be great if somebody can write piece of software that automatically detects malicious footprint (like antivirus).

I've got over 40,000 songs on my digital server. I have never come across a maliciously recorded digital song. I've had damaged CDs give me silence, clicks, pops and stutters but no blasts of noise.

Each person gets to worry about those things they choose to worry about, but it strikes me that you're concerned about item number 4,999 on the list of 5,000 things that can go wrong. The only way I might be concerned is if I were downloading music from "free" services or buying lots of pirated CDRs.

Lots of people have had blown tweeters over the years and I'd be fascinated to hear of one blown by a malicious digital recording.