Here's a funny story - I once made a set of mics to stealth with - tried them out at the HORDE tour in 94-95?
I must have used some info similar to the Linkwitz mod - but didn't pay attention as carefully as should...
I had the capsules and some 9V batteries - went to Radio Shack and bought two of these...
Yeah - they worked - but super bassy...
well - not those exactly - whatever Radio Shack would have - I thought I had just exchanged the words "resistor" and "capacitor" - but maybe I did follow the directions - Whats a coupling cap do?
Its the cap that blocks the dc voltage the capsule operates on and allows just the signal out of the capsule to connect to the next stage with out passing DC
So the value of the coupling cap is important. if its too low of a value it will reduce bass if its too hi it will allow to much to pass...
it sounds like what you created was a low pass filter
on the output of your mic
lopping off all the top end
Chris