Quote:
JohnM wrote:
 I've added an initial emulation of the R-DES parametric filters to the current dev build. Was the subsonic filter bypassed for those measurements? There is a subsonic roll-off which makes it a bit trickier to accurately match the Q. If the subsonic filter was bypassed on R-DES, did you have a cal file loaded for the SB Live? |
I am not sure if there is a subsonic filter or not. That sounds vaguely familar, so perhaps the unit does have one. If there is one, I am not sure if it was on or off. I didn't see any option to enable/disable such a filter; but I also wasn't looking.
I did have a fresh soundcard calibration in effect for the measurements. I performed the calibration right before I wired the R-DES box into the loop. The souncard was pretty flat from ~4.4Hz to (~20KHz? I don't remember). I also cleared the meter/mic calibration, and turned off C-weighting compensation. Thinking back, I may have had C-weighting compensation ON when I did the soundcard calibration. Would that affect the soundcard calibration?
I included a baseline measurement of the R-DES where I had no filters configured. The low-pass filter was present, but that is non-defeatable -- I just mean that I had the gain set to 0.0 dB (which causes them to "gray out" in the UI) for all the tuning filters. Perhaps that could be helpful for determining what effects are from the filter vs. some non-configurable aspect of the R-DES (subsonic filter) or my test configuration (soundcard cal).
If I can help by sending the souncard calibration file, or re-doing the measurements with a different setup, please let me know.
-Max