Yamaha CM500 hookup to 6600?

Need to connect a Yamaha CM500 headset mic to the rear panel of a 6600 (non-M). With my CM500 (no pinout diagram or mini-manual included) - box doesn't say if it's dynamic or electret, but it comes with a separate mic(?) in-line small plastic box - a 1/8" TRS female jack and a pendant 1/8" TRS plug, and it holds 2 AAA  batteries. Does this mean it's electret and this is how using the battery (bias?) box gets bias to it in a unit that's looking for a dynamic mic and provides no bias? Web search for pin-out/element type used in the CM500 hasn't helped - no joy.

Much has been written here for connections to 6300's, 6500's, 6700's, M Versions of 6400/6600, etc. and there's even a caveat about some CM500's being wired differently. And I didn't see anything about which MIC definition (Default/Heil/etc.) folks used on the 6600 with the CM500 so that all's well.

So who's using a 6600 (not M) with a fairly new CM500 and has it all working fine? Could I hear from you? rayday**at**cox **period**net.

Thanks, 73,
Ray N6HE