I've had great luck running mics directly into the R09:
- lav mics > battery box > R09. Any mic, AT853, Sennheiser MKE2, or whatever
- CK91/93 > self-made actives > R09
- AT822 > self made box > R09
All of these work great. Under any amplified music setting there should be plenty of level to use the internal "mic" "lo sens" settings.
My latest project is to run my Beyerdynamic MC930 into the R09. I'm going to try powering the mics with 18V (two 9V batteries in series). I'll post here if it works
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Richard