Input Impedance of Belles 150A Reference Amplifier

Can anyone tell me the answer to this question? The Power Modules website lists the specifications for the newer V2 version of this amp, and I don't have a copy of the manual for my amp. Thanks very much!
Click Belles 150A Reference on Google. There you`ll find a German web site and you`ll find EINGANSIMPEDANZ 100K ohms.
Eingansimpedanz translates in English for Input impedance.
Sorry, it is Yahoo web search not Google.