solderdude
Grand Contributor
I did try both tape types. Made more or less no difference to measurements!
Still it is worthwhile measuring the FR at -10dB instead of 0dB.
You can use the tape you currently have and adjust bias so that FR is flat when measured at -20dB or if it makes little difference at -10dB.
After adjusting bias to that tape simply continue using that type of tape.
FR at 0dB may not measure linear while it could be at -10dB. Given treble levels rarely make it above -10dB it should sound good while lower frequencies can still be 0dB or even over it.