Ideally impedance input would be matched exactly to the pickup used, but this is impractical in the real world, so manufacturers have settled on a value they feel works well with everything.
For instance, my SunnAudio Stage DI was designed to match perfectly with Dazzo pickups, which I have in all my guitars. They spent a lot of effort to get this just right. The reality is this impedance also works well with K&K, JJB, undersaddle pickups, and anything else that has been plugged into it.
The Blender DI SunnAudio built for my open mic gets the gamut run through it, but Dazzos are perfect. Pretty much run flat. Dazzos sound great, but K&Ks don't need EQ either. Once you have a high impedance input impedance, it becomes the circuitry after that tells the tale.
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2007 Martin D 35 Custom
1970 Guild D 35
1965 Epiphone Texan
2011 Santa Cruz D P/W
Pono OP 30 D parlor
Pono OP12-30
Pono MT uke
Goldtone Paul Beard squareneck resophonic
Fluke tenor ukulele
Boatload of home rolled telecasters
"Shut up and play ur guitar" Frank Zappa
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