--- In [email protected], "Claudio Re" <[EMAIL PROTECTED]> wrote: > > Hi Alberto , > any idea how to perform a real laboratory test on it ? > I fully agree with you on the analisys ,but I am not used to rely on > opinins instead of measurements . > > 73-Claudi I1RFQ
Ciao Claudio, well, measurements on the group delay of crystal filters have been done in the past, and moreover I suspect that they are much dependent on the specific model of the filter. Anyway what could be measured is the impulse response of the filter, and from it characterize its frequency and time related behaviors. What cannot be measured however is the subjective effect that the group delay has on the perceived quality and "cleanliness" of the audio, short of implanting a few electrodes in the brain of the listener... but I am not volunteering for that....:-) 73 Alberto I2PHD
