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There are CD-only players whose chassis are almost sealed (except the small gap at the tray opening).
On the other hand, there are CD players with many vent holes on the top, back, or side panels. In the long run, will the transport in such a CD player operate poorly due to accumulated dust?
Follow Ups:
Designers must have good reason for vented- players vs. sealed ones.
The CD player you are showing is a top loader.
Usually the transport portion of a front loader will be separate from the rest of the unit.
As others have said, those with a tube output stage, will need more ventilation than solid state. To vent or not may be just a design element, or during the design they found a component that was failing due to heat.
I had a preamp that had a component that would fail every six months or so. I had the wood cabinet modified originally to give me easier access to the tubes, but decided to leave the top off. The component never failed again. Once in a while I would take a soft paint brush, and the vacuum to remove the dust.
My Ayon has two vent holes each above the two output tubes. I have replaced one of the tubes over its 5 year life and that one failed early. This top loading unit has a particularly tight lid and I've never had occasion to clean the lens or need to. I always keep the lid on except when loading a cd.
Not having vent holes in my CDP.
I added ali heatsinks to most everything in there.
Did it make a difference? not as I can tell :-)
But at least the case top no longer gets warm
I think that with a tubed unit the heat induced circulation is a real issue for dust, less so for SS but still a potential contributor. The most dust problems I've had, i.e. I was constantly cleaning the lens, was a tubed unit with 6 tubes.
Plus I have pets...
The fact is if you do not brush off every disc you insert.. You yourself add way more problem foreign material which can damage the reading of disks. (I brush off every CD or DVD before placing in machine, every time.)
Even tiny invisible dust on the read surface of a disc will hit the lens as it is reading and eventually damage it.
I remember the early pictures showing a particle of airborne smoke as a boulder compared to the reading distance gap between laser and disc.
So I would not worry about holes in the chassis.
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