If you mean input sensitivity then 0.775v.
No, sorry, but thank you. I mean the input impedance. All amplifiers have an input impedance and all preamplifiers have an output impedance, you want to match them well or you can have issues that mostly affects bass performance. They say the amplifier input impedance should be at a minimum 10X the output impedance of the preamplifier. My preamp has a higher output impedance and so I'm trying to find out what the input impedance of the ZA3 is. If you're wondering why I am interested in using a preamp with it if it already has volume is because I want to you this in my main audio system and use it as a power amp, not as an integrated amp with volume as it is now. There are a ton of people doing this.
