mortod;230718 Wrote: > DRC applies mic calibration to the filter, not the TestConvolution which > means that all those frequency responses are without mic calibration and > *are* comparable.
Thank you -- an explanation that makes sense! Now I understand why my normal flat Test Convolutions look like my ECM calibration file. It's consistent -- if my system & room were (theoretically) perfectly flat, the resulting uncalibrated response would look identical to the freq response curve of the mic. I also confirmed this in the real world. Using a sweep recorded by a calibrated ECM8000 mic, I created a filter using normal.drc with a flat target and my ECM8000's custom calibration file (not the standard one in DRC). I then used an Earthworks M30 to record a "Sweep (with EQ in L channel)" test tone with the ECM8000_normal_flat filter in use. I processed this and looked at the Impulse_Response_Measured graph. (Although the Impulse_Response_Measured file is not corrected with the M30's mic calibration file, the M30 is flat enough without correction for this test). Anyway, although the resulting freq response is far from perfect, it is moves around a flat-ish line, and does not have the big +10db hump at 10k that is characteristic of my ECM's calibration file. (The graphs are in post #11, here: http://forums.slimdevices.com/showthread.php?t=38758&page=2) muski BTW, a little drc trick. Tired of constantly having to use Audacity to convert my xxx_Test_Convolution files from 32 bit float to 16 bit integer to graph them in REQW, I discovered that if you change the last line of the .drc files line to TCOutFileType = I (instead of F), it creates 16 bit integer files... -- muski SB3->Bryston BP25DA->Bryston 4B SST->Wilson Watt Puppy 7 Transporter via XLR->Headroom Max Balanced Headphone Amp->Balanced AKG701s & HD650s ------------------------------------------------------------------------ muski's Profile: http://forums.slimdevices.com/member.php?userid=3670 View this thread: http://forums.slimdevices.com/showthread.php?t=35615 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
