CDT Audio mid/woofer and subwoofer drivers mounting specs.
           
MODEL DESCRIPTION        
      Frame diameter Mounting depth Mounting hole
      O.D. inch inches inches
CL-4X 4"coaxial speaker   frame 4"  ears 5" 2 1/8" 3 7/8"
CL-5X 5.25" coaxial speaker   frame 5" ears 6" 2 1/16" 4 1/2"
CL-6X 6.5" coaxial speaker   6 1/2" 2 1/4" 5 11/16"
         
         
CL-4 4"      Stamped midrange driver   4" ears 5" 2 3/8" 3 7/8"
CL-5 5.25"  Stamped midrange driver   5 1/8" 2 1/2" 4 7/16"
CL-6 6.5"   Stamped Euro frame midrange driver 6 1/2" 2 13/16" 5 11/16"
CL-6100 6.5"   Stamped (large 6.5") frame midrange driver 6 5/8" 2 7/8" 5 11/16"
         
CL-1015 10" stamped subwoofer   10 3/4" 5 7/16" 9 1/4"
CL-1215 12" stamped subwoofer   12 5/8" 5 7/8" 11 1/4"
         
HD-4 4" Professional HD cast alloy midrange 4 7/8"  2 1/8" 3 7/8"
HD-5 5.25" Professional HD cast alloy midrange 5 1/2" 2 5/16" 4 7/16"
HD-6 6.5" Professional HD cast alloy midrange 6 11/16" 2 3/4" 5 11/16"
         
HD-5EF 5.25" Euro Frame HD cast midrange driver  frm 5 1/4" ear 5 15/16" 2 7/16" 5"
HD-6EF 6.5" Euro Frame HD cast midrange driver 6 1/2" 2 3/4" 5 11/16"
         
         
HD-1020 10" cast subwoofer   10 5/16" 5 9/16" 9 3/8"
HD-1220 12" cast subwoofer   12 3/4" 6 1/2" 11"
         
ES-400 4" cast  competition midrange    4 7/8" 2 1/8" 3 7/8"
ES-500 5.25" cast competition midrange   5 1/2" 2 5/16" 4 7/16"
ES-600 6.5" cast competition midrange   6 11/16" 2 3/4" 5 11/16"