The cheap fix is to get an inline adaptor for your DC,s I was issued with one of these things years back when we worked aircraft with both british and american intercom systems.. .. .if you own the aircraft then try the PS engineering website <a href="http://www.ps-engineering.com" target="_blank">www.psengineering.com</a> i think !, for the very best in intercom systems that dont seem to have headset mismatch problems.. . . . <small>[ 22 March 2002, 19:10: Message edited by: A and C ]</small>