"Bad Vibrations"

[Fourontheboard]

Hello
I am new to this forum and have a perplexing problem.
I just bought a bass and thought initially that the strings were vibrating against the fingerboard when playing fast pizz.
After messing with it a while i had a friend hold various strings and finally figured out that I am getting a horrible vibration
[harmonic vibration?] on my open D string when playing any other string. Also the D string doesnt sound too good when played either.

I tried various types of strings and had the same result

Any help would be welcome

[forester]

bridge...fit and location/ soundpost..fit and location..it does have a soundpost,right? i'd start there..shim notch @ nut/bridge (D) see if it goes away..tailpiece?..you have to change something in the combination that's exciting the string. good luck you'll find it if you are persistent

[arnoldschnitzer]

Your problem is most likely the nut groove on the d string. Either too low, or not angled down enough into the pegbox.

[Fourontheboard]

Thanks, I will get with the guy who is working on it and suggest these variables.