Quote:
nick72 wrote:
 I did a loopback test from my soundcards line out to the line in, removed all calibration files and C weighting. The result, no pre-ringing of any kind. Just the standard post impulse lobes like those displayed in the REW Help File (I can't say I understand why those post impulse lobes are there though).. |
They are there because the response of the soundcard does not go right down to DC. To have a perfect spike requires that the card be flat from DC to half the sampling frequency, about the only time that occurs is when an internal digital loopback is being used.