Quote:
Originally Posted by
zindra 
Thank you Coris, did removing the fan cover remove much of the noise?
I was not referring to that mod though, if you follow the link to tweakaudio provided in my previous message you'll see how it recommends to remove the unit's cover to prevent heating and improve sound, they even sell a removable oak dust cover for this purpose. I am afraid dust getting into the Oppo may not be the best thing:
We can sell you a dust cover that will allow lots of heat ventilation and allow the unit to both run cooler and the noisey fan will never come on. Some people would not care if they run the unit with the cover off but others have children and also might not like how the naked unit looks in their setup. This dust cover degrades the sound slightly (less than the standard cover) but can be quickly removed. When you want to remove it for serious listening you just lift it off.
You know, I personally do not trust very much such solutions sold for quite important money... I think one will not want to pay almost twice the price of a standard BDP95 for have another cover with so and so properties...
In the case of the fan and its noise, one may know that a part of that noise is generated by the wrong designed (cheap solution) mounting system of that fan. First, the fan should be mounted through some special designed silicon material damping devices. Such small but "smart" pieces of material are used to remove the vibrations and silence the computer hard disks in a computer cabinet. The vibrations from that fan are amplified quite much by the enough thin plate the player enclosure is made of. The way the player `s cover is cut it by Oppo in the production process, and the way that fan will blow out the air, is not a very happy solution. The holes there create quite much turbulences in the air flow and that generate a quite big part of that noise. This is a personal observation, after I removed that piece of metal in the front of the fan. The frequency of that noise were changed so that were less disturbing.
Another part of the noise come from the mechanical construction of that standard and cheap kind of fan. There are special low noise fans which Oppo had to used in that place in a quite high end product, which target an enough audiophile customers marked.
The noise of an low noise fan can be even lowered by lowering its speed. But then is lowered too the power of ventilation inside the enclosure. So another cooling solutions have to be in place for a decent cooling in a so high fidelity product. Here the case become a little bit more complicated...
Trying to reduce the noise of that fan by cutting out that piece of metal in the front of the fan, and using a low noise fan in the place of that standard/cheap one, will solve quite well this issue...