I'm almost pulling the trigger on a W4S preamp, but want to know if it's gonna be a good match for my Emotiva XPA1's mono amps. I've heard that there's some kind of an issue with the W4S and amps input impedances.
The W4S STP-SE has an output impedance of about 100 Ohms. It should be fine with just about any amp except for ones with the lowest input impedance (less than 5K) and I can't think of any right now.
Koestner is right on the money. I have owned the STP-SE for going on 3 years. It is golden with any amp with a input impedance of 8K and above in my experience. I used own a Marsh A400s (balanced input of 4K) horrible match.
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