Anybody own a component that sounds better with the cover off?

Stereophile's Jonathan Scull was beyond anything so crude as removing covers. He claimed to torque and align the screws for the best sound.   

Of course he also claimed to be perplexed by a change in his system until he realized the cleaning lady had vacuumed his rug so the fibers were going the wrong way. Never quite sure if Scull was blowing smoke, or just inhaling a little too deep.

One of my early vibration control lessons, dealer told me people like their Aronov amp better with the cover off. Sure enough, no doubt. 

This is almost certainly due to the elimination of cabinet ringing. These things all vibrate, that is why they sound better on springs. And they all ring, that is why they sound better with damped springs like Pods. Cabinets are a trade-off between sound quality, dust, and safety.