> A known floor noise of the dr-680 in high gain is from the phantom power, and the?Busman mod changes some components on the preamps, like some condensers and the opamps, and those condensers could be the solution on that kind of noise, but not all.
The biggest noise on dr-680 mk1 is poor phantom power. Our own Paul Hodges found a cure which I believe is now in the Busman mod as well as the dr-689 mk2 (Tascam Europe were modifying mk1s at one time when Tascam Japan were denying the problem) This affected Soundfield SP200s and early Brahmas badly. It should not affect TetraMic and mikes properly designed to be resistant to Common Mode noise. http://outrecording.com/tascam-dr-680-noise-test/ DR680 have poor P48V noise. http://www.audiomastersforum.net/amforum/index.php/topic,8654.msg77163.h tml#msg77163 Paul Hodges has a cure. Increase P48V decoupling from 0u5 to 47u The TASCAM specs are meagre and only suggest the Mk2 is still some way from MH/SD/RME/Motu noise. Busman isn't much better when he says "lowers the noise floor in the high gain setting by over -8db" so I dunno what improvements his supa dupa OPAs bring. > Because the Tetramic have a known noise floor highest than others mics like a SF ST350, I thought: less noise always is better, then I decided for this option. TetraMic is inherently very quiet. Your venue noise will be more intrusive even in a quiet studio. Try John Leonard & Paul Hodges TetraMic recordings from Ambisonia.com & to check this out. http://ambisonic.info/audio.html ST350 is badly flawed but ST450 sorta returns to the performance of a Mk5 Soundfield. ST450 is quieter than TetraMic .. but only if you recording quiet Nature stuff. What TetraMic does need is the very best preamps. If you have a Metric Halo, Sound Devices, RME, Motu 4pre (or Traveler when its working properly 8>D) you'll get TetraMic's full noise potential which, as the Ambisonia excepts show, is rather good. For lesser preamps, the new PPAc from Core-Sound, which simplifies life if you have to run long (or short) cables, gets you nearly 2dB nearer that potential. It doesn't make TetraMic inherently quieter but 2dB more output means the preamps will sound 2dB quieter. _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
