Bozak concert grand speakers

I'm not an audiophile but my younger brother told me dad added a " crystal" bar ?? For treble??  Does that make sense?

My error, it was Wharfedale whose large enclosure models incorporated sand filled chambers.

I would just list them on Ebay as a cash-and-carry only item and you will find a buyer.  There are a lot of people who love those vintage speakers.  I sold my father's EV Royal 400 on Ebay in 1 day, whereas they sat here for a month without a bite.  I have no idea of how much they are worth, but you can figure that out.  Good luck.  I'm old enough to remember them, but I never actually heard a pair.  

@mlolaird- it is possible that your father added a super tweeter. I am not familiar with the term "crystal bar" in audio, but there were piezo electric tweeters, electrostatic ones and others. Can you get more information from a label on the back? 

It was a popular tweak back in the day, to fill up bags of sand and put them inside some speaker cabinets for additional mass and rigidity. And yes, I remember a few manufacturers having " bins " as part of the design for adding sand / lead shot ( not Bozak ). Enjoy ! MrD.