Thanks JKent! I have had no luck finding info on these besides some specs, so I was willing to try anything. You never know where the vintage Japanese speaker folks are hiding...lol! I think I found this manual and was looking at the website.....and if you scroll down towards the bottom of the page where it shows the LS-10, LS-15, LS-20 and LS-88, notice the LS-20. It is a different LS-20 than what I have. That one is a 2-way 100w speaker and mine is a 4-way, 350w speaker. Mine looks more like the LS-10, LS-15 and the LS-88. The LS-20 they are showing looks nothing like the others. Kinda strange eh?