Bad sound

[adda_as]

One of my D'strings makes a really bad sound.
it's only one string, the one I hit at the downstroke. I changed strings because of this, but just after a week with new strings the sound came back. I used the same strings on my old mandolin, and didn't have that problem. There's no loose screws, so that's not the prob either. The sound comes from around the bridge.

Here's a soundclip of the it; first the bad string, then the normal string.
.Bad string sound (http://mandolingutt.net/badstring.mp3)
Hope you can help me out here.

[Strado Len]

Does the buzz occur when the string is fretted, or only on the open string? If only on the open string, the problem may be in the nut slot. It may be dirty, too low, too large or too small for the string, or just badly cut. If you're getting a buzz on all frets, I would check the bridge slot. You can clean up an uneven slot with a needle file, but use the file very sparingly. Too much filing, and you'll have to fill the nut, and then re-cut it.

[fatt-dad]

I couldn't check out your link (IT restrictions on streaming audio). However, my most recent buzz ended up being the truss rod. The buzz only happened on one string and it was very noticible. I would remove the truss rod cover and see if the truss rod is moving. If it is, you may try to dampen it with a piece of cardboard or something else to see if this removes the noise.

f-d

[bluegrassjack2]

Also if you have a pick guard, it could cause the buzz. I removed mine and my buzz went away.

[Kevin@bluegrassbrethren]

When I play my mando all the strings sound bad....... http://www.mandolincafe.net/iB_html/non-cgi/emoticons/tounge.gif

Could not resist.......... http://www.mandolincafe.net/iB_html/non-cgi/emoticons/mandosmiley.gif

Can't really tell from the file but could it be/do I hear overtones there?