Ricardo
Place in ads for sale, plenty of pics, detailed history & detailed description, etc....I suppose you could post a link here to the classified ad section. Post price, methods of payment accepted, date new & dealer (seems like it was dubravko), where you will & won't ship, do you have cartons, how you will ship, get shipping prices, etc etc
In short, if you think of something about the speakers write it down & include it.
Also, in short, the above ad is pretty well useless IMO (with all due respect). If you're not 100% commited to selling you may well be totally wasting your time. It's a bit of work but it beats sellling them back to a dealer as long as you are commited to the work & effort & dealing w/ tire kickers.
Don't worry about selling them, they are only objects, made to be bought & sold...I bet Nicholas Cage, when he first bought his '63 Ferrari 250 GT SWB Berlinetta Scaglietti thought he would never give it up...these normally are made available only when the owner dies...but Cage apparently had his kicks after several years & traded it to a neighbor of mine for an '06 Bugatti Veyron PLUS $1.1M cash (Veyron has V16, 4-turbos, 1001 hp, 256 mph terminal velocity).