Impedance matching for DI to Mic Pre

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Hi people,

I am in need of some advice on impedance stuff, I'm very new to this stuff so please forgive me if I dont make sense. I have mic preamps that state a 5k input impedance, is there an optimum impedance to input to that for best sound..?
I am trying to get a passive DI box built for Active + Passive bass guitars... does this mean I would need two different transformers..Ive heard an active bass has a very low impedance compared with a passive one.. Ideally I'd like a solution where I could have both options with the best matching for each to my 5k impedance Mic preamp. Any advice would be most appreciated!

Thanks for reading

Dave
 
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