Haunz 10+ year member
Packing 4/0
We obviously can't make two coils using different materials the same.. so this time try to forget about DCR... The aspect I bring to the table is based on performance considering identical mass and wattage (and not DCR per say)... so lets try an aluminum coil with a corresponding larger dia. wire and overall O.D. for the same mass and wind height and see which handles more power and has the better sensitivity...Yes, there would be a difference in mass if the coils were even somewhat similar (if they were of equal mass they wouldn't even be close)... example :
4-layer copper / 63.5mm former / 45mm WW / 7.01 ohm = 0.48mm diameter wire / ~113 grams / 67.74 mm OD
4-layer CCAW / 63.5mm former / 45mm WW / 7.06 ohm = 0.54mm diameter wire / ~40 grams / 68.19 mm OD
If we try to make them of equal mass the CCAW coil would need to be about 97mm long given a DCR close to the above (7.17 in this case).
I must admit that aluminum has some advantages for SPL burping being light weight, and with it's gram for gram heat capacity.. but copper is clearly the better conductor, and is much more suited to playing music / overall abuse....