There is no attenuation available on the JB3 mic pre...that is somewhat crippling...it's almost guarenteed to overload...no matter what mic you might try...
So you will need attenuators...which will add bulk and more metal things to your rig...
oh man...hexy...deja vu. Why would anyone need attenuation? Quite the opposite - you will likely need a preamp. You have to use line-in and these mics aren't going to put out anything near line level.
And to make sure I wasn't nuts, I just recorded the same thing using CSBs with mic-in and line-in. There was no brickwalling - music was at conversation level and the peaks were at -55 dB. The top end of the mic-in is not there - high frequency rolloff is built in to the mic-in setting. It is completely unsuitable for music recording.
What experiences have you had that have you convinced the JB3 easily brickwalls?
Here's what I am basing my theorys on...and I have to go back to the old school to explain this...
I own a Sony D5 portable analog recorder. Very nice device...Pro-sumer type thing...sold in the Sony Pro Line...
It has two 1/4 inch unbalanced inputs...it also has a switch..."0db" and "-20db"...you simply cannot record a show with the switch in the 0db position.....same with the sony portable DATs...if you do...you will get either rampant distortion...or at best, a muffled souding, noisy recording...sounds just like what happens with the JB3...?
You do understand that the JB3 mic-in IS a mic-preamp...? ( I can tell some don't understand that)
Has anyone tried to use the JB3 mic in with some quality attenuators? That's the only test Im willing to accept...
There is a QUANTUM leap between mic voltage and line level...so of course - no mic will produce that kind of output...
Again...I can believe that there is some sort of roll off...but it just seems pretty strange that they would do that...
Unrealated question...I wonder if the mic-pre behaves differently with different versions of the Jb3 firmware...

Folks - Im not about to start using the mic in...but using the line in and adding 20 something db of gain is post production is not a great way to tape...