The DQ-10 originally came with a set of 3-three-inch tall feet that get screwed into the bottom of the speaker. Then there were two different stands available. One has three pillars holding up the top plate and the other had one wide pillar. For both of these the top plate had a rim across one long edge. This was use to either keep the speaker from being pushed back with the rim to the rear or to tilt the speaker up a bit if the rim was on the front of the stand.
I have used my 10s with the short feet, sounds like one is listening into the orchestra pit. Next up was a pair of milk crates at about 11½", still a bit too short. Then a second pair showed up and I needed 4 stands and used the dining room chairs at about 19" tall as set up. This was too high. But the wall of DQ-10 had an interesting sonic characteristic that Thain noticed. Some of the sound from each channel, for example the left channel would have some information coming from the speaker on the left of those two and other sounds on that channel would come from the right speaker on that side.
Finally, I have found the proper height stand in my home. A friend brought over his Sansui 9090db and with it he decided to haul a pair of Sansui SP-X8000, with some drivers not working, haven't tested them individually. Didn't know where I was going to put them and well they were a ~6" taller than the Bose 901 stands which was good in my room so I stored them under the 901s while I was using those speakers. When the guys came over we wanted to hear Steve's rebuilt MC-225 we moved the Bose and put the Dahlquist on top of the Sansuis turned on their sides...Just the right height at about 18 inches. I'm going to try to make a pair of stands about this height per the drawings on the Yahoo Group of the three post design. Again, Thain steps up and comments about how useful the Sansuis are being ideal speaker stands for either the Bose of the Dahlquist.
Building my own they can be the height I prefer. The stock stands seem to be a bit shorter in the 12-13" range but I have not measured these, just looked at info in the Group files.
Long story short, I agree with Freddymac2 about the 18" stands for the DQ-10s.