Originally Posted by zgeneral
Again, the companies design the products knowing the thermal threshholds. They've all been doing this for a very long time. That something gets warm doesn't mean anything. It's designed that way. The manufacturers give you specifications of ambient operating temperatures. You don't need to worry about heat. The manufacturer knows how much heat the things put off. It's a non issue. You're dreaming up a problem that doesn't exist.
Since you're bolding, all amps sound the same below clipping, so spending $500 on amplification that you don't need is a stupid thing to do.
Sorry about the bold, I meant it to draw attention to a point in the thread not to scream it. I will try and use caps next time <kidding>.
I am not dreaming up a problem that doesn't exist at all. Your idea of a bulletproof design is often not a reality.
Here is something that might make you think again about specifications...
Originally Posted by Onkyo TX-NR929 Manual Ventilation Requirements
18. If you install the apparatus in a built-in installation,
such as a bookcase or rack, ensure that there is
Leave 20 cm (8") of free space at the top and
sides and 10 cm (4") at the rear. The rear edge of
the shelf or board above the apparatus shall be
set 10 cm (4") away from the rear panel or wall,
creating a flue-like gap for warm air to escape.
Most AVRs have similar requirements.... If someone doesn't meet this (as many many don't) do you still think that the product can live in a shelf with 1" of clearance around it and not fail?
Bulletproof design is the enemy of profits. Which do you think is a corporations main priority?
I have worked in semiconductors since 1998 as a design engineer at more than one company and have a network of friends in various companies so I have some degree of insight into this. I am not trying to pull a credential card, I am just trying to show that I am not basing this on nothing.
While products have lots of design for reliability, design for manufactureability, reliability verification, burn-in, fault grading, and stress testing things are very often missed. One component that isn't properly tested or a bad batch of said components (often from an external supplier) can cause failures in even the best designs. Or a company will get a "deal" on an "identical" part from another supplier and change it without repeating the expensive test process. If that part isn't really "identical" then problems can ensue.
Ask Onkyo about what happens when you get a batch of capacitors that don't meet their design specifications.... After a while the heat degrades them and then the HDMI boards fail and the units don't work anymore... On the amplifier side I have read that Parasound's 1206 also had an issue with cost cutting and sub par capacitors that lead to failures.
I know that capacitors can fail when they get hot and I also know that I can drop internal temperatures of my receiver's HDMI board by 20 degrees with an external laptop cooling pad fan. The receiver doesn't have a fan there so I guess it is a bad idea to add one in your opinion?
I agree that buying anything that you don't need is stupid unless it brings utility (fun) to the purchaser.
My argument was that there are other factors than how the amplifier sounds when considering external amplification. Your opinion is that reliability concerns are not valid and I disagree.