[quote name='Dan Dare' timestamp='1422211357' post='2669909']
Think it depends on the instrument. I find a high mass bridge gives clearer noting especially at low frequencies but can rob an instrument of warmth and 'bloom'.
[/quote]
I agree. The key is stiffness. If the bridge is low mass but the bass is otherwise very rigid (e.g. through neck and carbon graphite), a high mass bridge won't make a huge amount of difference. But if the instrument is old and fragile, with a poorly routed neck pocket and light wood, a high mass bridge might provide a more secure, less dampened point from which one of the string can vibrate.
Of course, you might LIKE the sound of a half dead bass...many do.