fc@lexicon.com (Frank Cunningham) (04/25/89)
> supply on with the new fan just dangling---it was practically silent. > "Wow!" I thought, put everything back together, turned the power on, > and---the new fan was as noisy as the last one (but no more periodic > garbage disposal). It looks to me like the 2000's fan is noisy only > because it's accoustically coupled to the rest of the machine. I know I haven't checked this on the Amiga yet, so I'm perfectly qualified to comment: Your guess is obviously correct, and there are two mechanisms: mechanical and acoustical. Mechanical covers motor noise like bearings. Acoustical is much more interesting and covers "white" noise effects that result from cramming the air through grates and filters, and siren effects that result from the fan blades rotating near supporting members and chopping the air stream. It is difficult to eliminate this noise without keeping the fan blades away from miscellaneous gratings. Even the fan motor struts aggravate the problem. -- -Frank Cunningham smart: fc@lexicon.com dumb: {husc6,linus,harvard,bbn}!spdcc!lexicon!fc phone: (617) 891-6790