Was tested Tascam dr-07 internal mics , mic capsules Panasonic WM61a and Primo EM172 response curves
Used two different self made preamps. First pre1 = with NE5532 and second pre2 on ssm2019
As reference WM61a capsule at line input. Some room equalization.
Levels are changed (mics are diferent sensitivity) for for easy compare.
Tests in my beadroom (so it is not for serious tests).
Legend:
pre1 = first preamp
pre2 = second preamp
mic in = conected to mic input
line in= conected to line input
wm61a_2.jpg tested wm61a mic with 2 diferent preamps conected to mic input (LOW gain) vs without preamp vs ref. wm61a in line input. Using peamp in mic input can boost frequencies over 6kHz, without preamp they are lost
wm61a vs em172 pre2 line in_2.jpg em172 capsules have very poor high frequency response. I am very disapointed for them.
Will try make some modification. Maybe it will help .
Sorry my english