Ach, another fellow Apogee owner! :-)
pleased to meet you Stanwal!
Hold onto those D-Sigs - they'll chew the pants of many of today's speakers! If you need to have themn refurbished it is possible today. There is an outfit in Australia that makes brand new ribbons to specs better than the orig Apogees & there are 2 installers in the USA who can take your D-Sigs & refurbish them ribbons, x-over, internal hookup wire & paint job. The total job is not cheap but you can do some of the refurbishing at a time as you budget allows. So, no need to get rid of the D-Sigs - help is available.
I don't know if you know about this or not but I thought that I'd share it w/ you. FWIW.