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My MC275 has a clueless sound-change...

I just moved my MC275 from the ground to on top of my rack. Same system and same cables, but the sound changed from musical, well tonal balanced... to thin, noisy, sharp, bottom-less... Anyone of you had such experience and can explain why would this happened? I have the amp sitting close (approx within 2-3 feet from the speakers' mid range section, can the magnetic field affects the operation of the tube amp? or is it that the cables needs to break in again after a few new bends... I am clueless, I switched my interconnect from my Pre to Amp... although it added weight on the bottom end, the mid to the top is still noisy, sharp and forward... please help...
infinity_audio

Showing 1 response by aball

aball
2,018 posts
 
I don't think your problem has anything to do with tubes. Sounds to me like what you are hearing is a support change.

The mechanical characteristics of the shelves in most racks are totally different between the bottom and top shelves because of the inverse weight distribution. The top shelf will be much more wobbly and and less damped (within certain frequency ranges) than the bottom shelf - particularly with such a heavy amp providing the guiding force.

I have been experimenting with equipment supports and it is clear that changing the loading changes the sound of whatever component is on it. This is a well known effect with monitor speaker stands but it turns out to be equally applicable to all other components - especially tubed ones.

Arthur
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