Behringer c2 modification
Among other mikes i own 3 sets Behringer C2. In one of them the electret capsule is damaged (nearly "dead") possibily because a helper pushed it in the clamp with his flat handpalm on the grille. Stupid.
Sound quality and stero image is very good, as long as you correct the freq. char. using EQ on the mixer or lateron FFT filter in the editting software. Noiselevel is adequate in silent churches when recording classical performances.
BUT: they have a serious design fault:
the output IMPEDANCE is NOT equal at both signal pins. Not only the audio is connected to one pin only (which is totally exeptable because the mixer sees only the difference between both signal pins), but the signal-less pin is also directly connected to mass for AC signals. So one pin is abt. 63 Ohm impedance, the other is 0 Ohms. That must be equal within 1% to obtain 40dB cable hum and noise canceling.
This fault will be noticed as hum or tikking noises during recording ! Caused by induction onto the microphone cable.
I devellopped a modification (which i send to Behringer) so the output impedance
balance is good and hum and noises induced onto the mike cable will be canceled out in the mixer input stage. For mod. see: OEIOEI my url is not accepted. Stupid.
Search for :
- Improove Behringer C2 mikes (old model).
or
- pa0nhc
or send me a mail, i will send you the url.
REM:
In one of my mixers mike inputs i noticed severe cracking noises.
Cause: 6k8 SMD input resistors in all 6 mike inputs were become bad.
Remedy: replace them all by PAIRED (within 0.1% equal !! , measureble with every cheap DIGITAL multimeter) 6k8 1/2W METALFILM resistors (the type with wires on them). The exact value is NOT important, as long they are EQUAL within 0.1% for each pair.
So buy a bag of 100 pieces 6k8 1% 1/2W resistors (a few Euro's) and select pairs (Conrad).
For more audio recording articles:
the same site as above, search for:
- pa0nhc audio techniek technics
Greetings, Nico.