Mingo,
I have had a pair of DL-15's for some time, about 10 years or so. I aquired them from the original owner but i believe they were made by mr dunlavy before he sold duntech to the australian firm that owns it now. I have the original documentation for the speakers and they state that a placement of 8 feet is optimal with 6-12 inch clearance from the wall with 12 feet of space to the back wall. I can attest to this. Specially since i have had to do two full restorations on each of these speaker as neither was in the greatest of condition. If i can get a scanner I will try and scan the manual.
I have had a pair of DL-15's for some time, about 10 years or so. I aquired them from the original owner but i believe they were made by mr dunlavy before he sold duntech to the australian firm that owns it now. I have the original documentation for the speakers and they state that a placement of 8 feet is optimal with 6-12 inch clearance from the wall with 12 feet of space to the back wall. I can attest to this. Specially since i have had to do two full restorations on each of these speaker as neither was in the greatest of condition. If i can get a scanner I will try and scan the manual.