Depending on the version--from I to V in Roman numerals, They cost was between $15,000-$30,000. They are very dynamic and will scale volume as well as any speaker. Great soundstage info and beautiful vocals. Despite the detail, they don’t hurt the ears at any sane level. They also have a 360 degree radiation pattern so sitting, standing or moving around, they still sound fantastic. The bass is to die for period. I have a pair of the MK-V speakers that I did a Star Sound points/ Inverted Couplers mod to that involved a little carpentry. But it made the sound more dynamic and with greater detail. I also have a fine pair of VMPS RM40 BCSE speakers with all the upgrades except the OXO. The SP Tech Revs have several advantages over the 40s which are already really good speakers--such as ability to play loud at most any volume, deep bass that won't break up, and the 360 degree radiation pattern to name a few.
Bob
Bob