Headphone and headphone amplifiers details. Headphone amplifier output impedance. Maximum sound level limiting.

[ index ][ back ][ site search ] [ acronyms ] [ discussion ] [ mail to a friend ] [ post message ]

ePanorama.net - Audio Documents

Headphone details

Headphone amplifier output impedance

Typically headphone performance is affected very little by source impedance. The (new) international standard on audio interfaces, IEC 61938 (formerly IEC268-15) calls for an intermediate-impedance source of 120 ohms and a source voltage of 5 V rms, which provide reasonably satisfactory performance (sound level, frequency response, distortion) with headphones of any impedance over the range of 8 to 600 ohms at least. So 5 V rms maximum behind 120 ohms is the accepted international standard which modern equipments use.

Maximum sound level limiting

Because the sensitivities of headphones vary so greatly, it is not possible to provide an output on an amplifier that will ensure that high sound pressure levels cannot be obtained with any headphones. The only way to limit sound presure levels is to hard-wire a specific type of headphone of known sensitivity to the amplifier.



Last modified: May 28, 2002
[ webmaster ] [ feedback ] [ friend ][ main index ] [ Disclaimer ] [ Legal Notice ]

Published by ELH Communications Ltd. all rights reserved.

You may have to register before you can post comments and get full access to forum.
User Name