gottawalk said:Again, IMHO, it doesn't give you more notes, it gives you different notes. The physical characteristics of the bass remain the same.
An extended range gives you the original notes plus the additional range beyond that without losing any of the original range.
You are assuming that the new tuning is still in fourths.
A drop-D tuning for example gives you more notes while still leaving you ways to play all the original notes. Fifths tunings also give extended range, and can be done with overlap to the original notes.
If we take the phrase "extended range" literally, then anything which increases the number of available notes is technically "extended range". This would include adding strings, adding frets, and using tunings which increase the distance between the lowest and highest strings.