A cursory peruse of the net indicates the following regarding the strings associated with the bassists sound ( apart from equipment and technique of course)
Bruce Thomas - heavy gauge GHS rounds (dunno which ones)
Dee Ramone - Rotosound Swing Bass 66
Glen Matlock - Rotosound 77 Jazz Flats
Graham Maby - Rotosound Trubass 88 Tapewounds
Nick Lowe - Flatwounds ( who knows what brands)
Captain Sensible - Rotosound Swing Bass 66
John Entwistle - Rotosound Swing Bass 66
Paul Mcartney - Flatwounds of various brands, notably Pyramid, La Bella and Maxima. Rotosound Trubass 88 tapewounds.
From that you can see there is dull thud to bright on the spectrum.