Preamp output impedance, Amp input impedance and drive ratio? Pass Labs XA25

You shouldn't be choosing your preamp based on impedance matching. It's the wrong thing to focus on IMO. Your amp's 47k input is sufficient to electrically match with any REASONABLY designed, properly working preamp. A 94 ratio and 1880 (or a million; whatever) are effectively the same for your application. Even a 20x ratio is perfectly fine. Your choice will come down to the usual suspects: sound signature, system synergy, feature set, price, aesthetics.

what he said

chat gpt doesn't help you when you don't ask the right question

That is great news I was worried that not pairing the preamp from the same manufacturer was screwing myself.  I have two placette passive linestages I kept because I liked them so much.  

Generally you want the input impedance of the amp to be at least 10x the output impedance of the preamp, but as with speakers impedance varies across the frequency spectrum so I look for at least 20x just to have some cushion.  As others mentioned, at 47kOhms you should be absolutely fine with most preamps.  Hope this helps. 

You've gone a little nuts.  47k input impedance is an excellent value, common in modern solid state amplifiers.  It's high enough that you can pretty much pick any preamp at all without worrying about an impedance mismatch. 

At say 4k, it would be an amplifier that you'd have to carefully match to avoid such issues.  

It doesn't mean anything more than that.  

Conversely, a preamp with very low output impedance can drive almost any amplifier without degrading the sound as the volume changes. 

thank you guys!!