BTW, does anyone know if playing high frequency sounds can be damaging for speakers. I can avoid this problem if they are, but just in case I need to be cautious I reckoned it would be best to find out.
depends on a huge number of factors...the average human can hear sound in the frequence range of 20 - 20,000khz...so most soundcards are developed with that in mind...also a lot of amplifiers (either built into the soundcard or outboard in the speakers) often clip frequencies above and below that range...not to mention that most common cheaper amps and speaker systems can't even reproduce the full 20 - 20,000khz frequency response range...hard to say really, except that well built tweeters are some tough little SOBs...but not everyone has them :P