I own 4 Beolab 3500 I purchased directly from Denmark 2 decades ago. They were gently used and have been in storage for many years. I tried to put them back to work with my iPhone using a bluetooth device I bought in England, but I haven’t been able to get them to play. Rather than keeping them in my attic, I wonder if anyone could used them. I have the original boxes. I live in South Texas USA. If interested, please email. Thanks.