replacement mid-bass woofer

Visaton W100S-8
Dayton Audio DSA115-8

100 to 150 watt doesn't mean more power.

speaker has linear excursion " Xmax"
likewise just basic sensitivity helps to

Most 4" drivers wont be rated thermally for more than 30 to 60 watts.
because in real life they reach excursion limits at around 3 to 20 watts

depending on frequency and application

the resonate frequency of the goldwood is likely around 100 to 150 Hz
and xmax around 1 mm

higher end drivers might have a resonate frequency around 55 to 65 Hz
with a xmax of 2 to 4 mm
so they are more suitable for bass response.