Hey guys, I know something like this has been discussed before - ive been here a bit - but no good solution I found.
I own a Brice Swamp Ash Douglas-J (75 fender J copy) 5 string (two actually, but the fretless version doesnt have this problem).
The E and B strings, when played (in any way, ive tried hundreds, Im sure) sound 'tinny' and hollow, whereas the A through G strings all sound nice and warm and thick.
The only time Ive got the E to sound nice was playing it really really quietly (so quiet that it wouldnt even work for my otherwise acoustic jazz band) and even then it was not that great.
In Eb tuning, it sounds a bit better, and similarly with F tuning, but there is still some remnant of the tinny sound. I thought it might be setup so ive changed action, adjusted intonation, etc, but to no avail. I even have new strings and Bartolini pickups, but not much difference (in that area).
I thought I might need to replace the bridge (also, since the high G post is unscrewing itself...those koreans...

), as maybe it was jiggling or something making that sound.
Note: the tinny sound also appears when I put my chin on the bass acoustically...so it is the natural bass sound.
And most other E/B frets work much better, like the diff tunings.
Any help, s'il vous plais?