kevyan 0 Report post Posted February 12, 2007 Hi all, my source Max. output is 20mW+20mW (16 Ohms Earphones). Does that means that I can only get earphones/headphones which is 16 Ohms and below? Share this post Link to post Share on other sites
radioactive28 0 Report post Posted February 12, 2007 (edited) No, it just means that with drivers rated at 16ohms, you can get a max power output of 20mW per driver. You're free to use earphones of any impedance, but the max power output and max volume will change accordingly. Try coupling a 300ohm headphone to an iPod. It'll work, but you'll probably only hear people squeaking at max volume. Edited February 12, 2007 by radioactive28 Share this post Link to post Share on other sites
Xiao_Catz 0 Report post Posted February 12, 2007 (edited) no need 300ohm la 70+ already very suffering le Edited February 12, 2007 by Xiao_Catz Share this post Link to post Share on other sites
radioactive28 0 Report post Posted February 12, 2007 (edited) Oh, by the way, just to add a point: a max of 20mW is rather powerful, considering that your typical bud rated at 16ohm and 95dB/mW theoretically reaches 95dB even at 5% power. The recommended safe hearing level is usually 80~85dB. If you're using good IEMs, the efficiency is usually higher, about 110dB/mW, with impedance of maybe 32ohms. Just do the math. And I doubt you're going to find earphones with less then 16ohms easily. kevyan, you're using iAudio X5? Edited February 12, 2007 by radioactive28 Share this post Link to post Share on other sites
kevyan 0 Report post Posted February 12, 2007 Oh, by the way, just to add a point: a max of 20mW is rather powerful, considering that your typical bud rated at 16ohm and 95dB/mW theoretically reaches 95dB even at 5% power. The recommended safe hearing level is usually 80~85dB. If you're using good IEMs, the efficiency is usually higher, about 110dB/mW, with impedance of maybe 32ohms. Just do the math. And I doubt you're going to find earphones with less then 16ohms easily. kevyan, you're using iAudio X5? Yeah... I'm using the iAudio X5L. I love the sound it produce on my TC20 and ES5 Share this post Link to post Share on other sites
rkivie 0 Report post Posted February 12, 2007 The recommended safe hearing level is usually 80~85dB. Probably irrelevant, but I'll just add on to this anyway. The Occupational Safety and Health Administration recommends a maximum of 8 hours of exposure to noise (or music, in our case)at 85dB. Every addition of 3dB makes the noise twice as loud and cuts the recommended exposure duration by half. Share this post Link to post Share on other sites
