Subject: Re: HC selectivity ... From: Kevin Austin <kevin.austin@xxxxxxxx> Date: Fri, 5 Oct 2007 05:04:11 -0400 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>Hi If I understand microphones, it may be necessary to revise the statement below to read "dynamic microphones", as I believe the statement is not correct regarding condenser (capacitor) mics, which can output DC, and are 90 degrees out of phase with dynamic mics. Best Kevin Martin Braun <nombraun@xxxxxxxx> wrote: >Microphones are pressure sensors, not displacement sensors.