« Reply #15 on: May 08, 2017, 10:54:42 PM »
I have 1 & 2 amp USb ports on a 20,000mAh battery. I 'm suspicious that because the battery output is 5V, the SD442 (5-18V DC snput ) the machine just thinks the externals battery is dying?
Update: SD442 had no issues running on 5V USB power and supplying 48V phantom power to 4 mics.
Wow....this is great gonna have a cable made for my mixpre!

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Mics: Gefell M20,M21- sms2000/nbob | Schoeps MK4V;MK4- cmc6/nbob | AKG ck1,3,8,22;ck61,62,63,69- c460b/c480b/Naiant actives | Neumann KM140/150 | AT853, AT933 | CA-11
Pres: Naiant Littlebox | Tinybox | BMod Edirol UA-5 | Church ST-9200
Recorders: Zoom F8 | Tascam DR-680 | Tascam DR-60D | Sony PCM-M10
Video: Canon VIXIA HF R42
**ISO** - Schoeps mk22 matched pair | Neumann Ak43 pair