Large brass devices on top of power amps ?


Browsing through photo gallery of several systems I have seen several amps where a large brass disc are placed on top of the amp.
I would really like to know what are the results adding these brass devices.
terryakhan
For my system I just bought some 5 lb weights with rubber surrounds from a big box dept store and put it on top of my CDP. I may put one on my amp or preamp for kicks to hear if it makes a difference and maybe later I'll put some dynamat or other similar material in the cases of my gear as well if I'm bored. To me it makes most sense to put some kind of mass on a CD player or source unit that produces vibrations.
I've used brass weights from Mapleshade for the last ten years, and found them to be effective in reducing vibration induced microphonics--leading what I hear to be clearer, tighter sound. Granted, and not to cause any more crazy-making obsessing (guilty: an audiophile trait), do brass weights beg the question of whether or not we're "tampering" with the carefully considered "voice" of the component? I'd be curious to hear how audio designers would perceive any change (negative or positive) to their respective gear with any type of mass loading.
I wonder why someone would put an apple in every amp photo. What is the point there?
Hi 6550c

I believe the seller who puts an apple in every photo with the equipment they are selling is trying to show the scale and size of the item. I check a collectible website often and I find that with a new statue they always include a picture of it with an apple for reference. The last picture has an apple with the Luke Skywalker statue.

http://www.sideshowtoy.com/?page_id=4489&sku=3000131&ref=feature_3000131

I've seen audiophiles use cans of soda to illustrate how big a port on a sub is or the size of a capacitor in an amp. Quite funny sometimes what people do.
Jed,
putting something in a photo is a common way to show scale in a photograph.

for example, I may intentionally include a bit of properly lit white so I can adjust color better. In photographing small objects (macro) I may include a ruler or sometimes a coin.
In landscape photography of the 'here I am' variety...not necessarily for art, but simply for the vacation album, including something of known size always helps people relate to the photograph.

Sure, Everybody knows how large a soda can is. Good idea, no?