
reshp1
New member
Was doing a little recording last night when I noticed a strange hiss from one of my MXL603's. It would only come when there was silence, after picking up a little sound, the hiss would go away and swell back as the sound faded, almost like I was "ducking" the noise with a slow release setting. I checked all my connections and they were good, but noticed that immediately after turning on Phantom power, the mic would work normally for 15 seconds or so before the hiss swelled back.
Not knowing if it was the mic or the pre (M-Audio Octane) or cable, I swapped the hiss mic and the other working 603. The hiss followed the mic. I also tried another set of SDC's on the Octane and they worked fine, so it didn't seem to be the preamp or the cable.
Now here's the really weird part.... I tried both 603s on the pres of my Digi 002R and they worked fine, which would suggest it wasn't the mics.
The only thing I can figure is that the Octane and 002R put out different Phantom power levels, and it seems to make a difference for only one of the 603's. The part about how the hiss would "charge up" and "charge down" does seems like a capacitor charging and discharging.
Anyone seen this before or have any ideas? or should I just avoid using the 603's with my Octane? Thanks in advance for any help
Not knowing if it was the mic or the pre (M-Audio Octane) or cable, I swapped the hiss mic and the other working 603. The hiss followed the mic. I also tried another set of SDC's on the Octane and they worked fine, so it didn't seem to be the preamp or the cable.
Now here's the really weird part.... I tried both 603s on the pres of my Digi 002R and they worked fine, which would suggest it wasn't the mics.


The only thing I can figure is that the Octane and 002R put out different Phantom power levels, and it seems to make a difference for only one of the 603's. The part about how the hiss would "charge up" and "charge down" does seems like a capacitor charging and discharging.
Anyone seen this before or have any ideas? or should I just avoid using the 603's with my Octane? Thanks in advance for any help