Need manual Luxman L-509u Amp


I can't find a manual for my used Luxman L 509u (Japanese version),  Searched all over the place and even emailed Luxman but can't seem to find a manual.  
I have 4 speaker binding posts but there is no speaker selection (A/B) and was wondering if it was solely to bi-wire.  Was looking for an easy way to switch between 2 different speakers (Revels and Magnepan.

I appreciate any input or advice
Brian

thebman70
That is a great idea but I don't think it's designed for either 4 or 8 ohm speakers. I took a picture but don't see where I can post it.  It has 8 speaker posts (group A and B).

Stated at the bottom:
A+B  8-16 ohm
A or B 4-16 ohm

I find it strange there is no switch for speaker A/B

I don't have a Luxman, but could it be that one side of posts is 8 ohm taps, and the other 4 ohm taps, versus what you are thinking. From an online picture there are markings under both of the 4 sets which are hard to read, but easy to check on teh back of your amp.