these are playback and record sweeps on a couple channels of the poofygoof studios Otari MX-5050. the repro sweeps are from playback of an MRL NAB calibration tape.

Jay McKnight from MRL suggested I try switching a channel from NAB to IEC and see how it performed, so I did. The extra lines on repiec4.png indicate corrections to turn an NAB cal tape into an IEC one, within a +/- 0.25dB window. I could probably dial in better with more tweaks, but I wanted a quick indicator of whether or not IEC would help me. Looking at the pseudo-IEC calibrated reciec4.png versus the NAB-calibrated record4.png it looks like I'd do well to get an IEC calibration tape. It should be noted that the biasing is identical between these two curves -- the only variable is the record and playback EQ.

sweeps were made with the help of Audio Precision's now obsolete System One test box.

      Name                    Last modified       Size  Description

[DIR] Parent Directory 24-Oct-2010 11:22 - [IMG] reciec4.png 08-Dec-2002 23:53 3k record IEC [IMG] record2.png 04-Dec-2001 11:36 3k recording on channel 2 [IMG] record4.png 08-Dec-2002 23:42 3k recording NAB [IMG] repiec4.png 08-Dec-2002 23:52 4k playing pseudo-IEC MRL [IMG] repro2.png 04-Dec-2001 12:04 3k playing MRL tape

Apache/1.3.37 Server at Port 80