[Elecraft] OT Slightly K3s and Studio Mixer

[Rich]

I am interested in using a studio mixer so I can use a single mic with 
two K3s.

The mixer output impedance is 150ohms and the K3 mic input is looking 
for 600ohms.

I have seen several articles using studio mixers with two radios but 
none mention using an audio transformer to correct the miss match.

Should I not be concerned about the difference in impedance?

Do anyone have a recommendation on a device to match the the impedances?

Thanks

Rich