JBL Olympus C-50 loudspeakers

Those are a real gems, they had some different configurations.  They either have 1 or 2 of the 15", 1 active and 1 passive or just 1 active.  I ran across a pair years ago and they guy wouldn't part with them.  An easy $5k-$8k speaker in today's world, if everything is in good shape.  Your options are limitless.  I love how JBL did these great speakers and the connects in the back are generally crap.  I have a friend with a pair of the L-150's that he has hooked up to 55 watts/channel Audio Research tube amp, with a McIntosh pre.  This is absolutely a real wonderful combination.  What it can do for jazz music is unbelievable.  I used to have a pair of JBL 4312's that I loved.  I ran with solid state and tube.  Both unique and wonderful.  I preferred with the tube amp, my sons preferred with solid state. 

First, JBL's have that classic unique to them California sound.  You can really contour the sound of these based on what your preference is.  McIntosh would be a great match for these or just about anything quality.

Speakers though, go plus to plus connection and negative to negative.    

One of the best older JBL’s, love them and they will hold there own even today. Here’s a link to the back, back of jbl c50 - Google Search. Use good quality speaker wire, you will benefit. Use the lower connectors in the back, connect to your amplifier outputs as mentioned above, use the one labeled "input" connectors. The upper ones are used for bi-amping only. Enjoy!

My Dad got these while on Wake Island in 1961 or 62. He has a Marantz Model 7 amplifier and a letter from Marantz dated April 26 1962 that told him he was too isolated from the rest of the world and they would send complete details as well as the materials necessary for conversion to Model 9. The C-50 has one woofer. I don't know how to hook up the Marantz either. I have them playing through a receiver right now set to radio. I have an extra turntable I can hook up to see how well they sound.