SW312WA03 is considered a drop-in replacement for SW310WA02 (both 4 ohm) in the same way as SW312WA04 is for SW310WA01 (8 ohm).
There are, however, small mechanical differences between old and new models that should be observed. Please see the drawings below for NOMINAL dimensions.
The main differences, as shown in red, are:
- T1, thickness of mounting flange
- H1, build-in depth
- D1, cabinet hole diameter
- D2, mounting hole position diameter
Acoustically/electrically there are no major practical differences between the old and the new models.
For comparison the relevant links are available in the table below.