The effort of finding, and registering for, this Forum just paid for itself manyfold. I recently acquired a PZM-30F. Big quandry was sorting out conflicting info between: -- "PZM-30R PZM-30F" document [k80351a6.pdf] which sez: "30R and 30F feature self-contained electronics which allow them to plug directly into a standard 12-48 VDC phantom power supply." AND -- Page 4 of the Summer/04 'Mic Memo' which sez: "The PZM-6S, PZM-6F, PZM-30GP, PZM-30F and PZM-31S are legacy (discontinued) Crown PZM's ... [that] got their power from a Crown PX-T, PA-18 or PX-18 interface ..." So, if I understand correctly... I should keep on using the PX-18's that came with my PZM-6LP's, but I can safely plug the 30F directly into my field mixers [shure FP31 and FP33]. j. p.s: Darned shame -- though understandable -- that the Mic Memo newsletters are no longer issued. Hopefully, as I become more familiar with the 'Crown Forums' I'll discover a way that they can automagically be periodically piped to me in digest form via e-mail.