Tiptronic transmission noise? @ 2.5k

[Hugh D]

Of course, I'll end up getting this checked out, but in a full inspection a while back the mechanic didn't say anything about it being a problem ...

From the first day I purchased my boxster about 1,000 miles ago I noticed the noise coming from the front center area of my car. I can only really hear it when I have the hard top on, so it's not loud, but it's enough that my friend noticed it without me mentioning it to him.

The noise happens at about 2.5K RPM... doesnt matter if car is hot or cold, I think.

The noise can be described as a .... slight rattle, I guess.... I dont want to say grind because it's not... I don't feel the car lose power or anything. It's like a half-second humming sound only during acceleration passing through 2.5k in any gear, it seems.

Anyway... .anyone have insight before I get it checked out? The noise is definetely coming from the front.... what's up there that could make this noise?

Thanks,