AudioSceptic
Major Contributor
Archimago's latest blog post examines the internals of an APx555 B Series <https://archimago.blogspot.com/2020/07/pictures-audio-precision-apx555-b.html>
Very interesting!
Wish they got the model of fan in this thing. Why it's not a Noctua for the price they're charging is a perplexity. I should as Amir how loud this thing gets in normal operation due to the fan...
Also, the blue PCBs are a lovely touch.
Noctua is a newcomer to industrial fans. It's not only the quality of fan, it's that they have chosen a small fan for the amount of air and static pressure they want. Any high output fan is loud. The solution is a larger fan or additional slower fans and fewer obstructions. San Ace, Nidec, etc. are great fans, but anything is going to be annoyingly loud if specified that way.
It is loud all the time. No temperature sensitivity. I don't know why they think this level of noise is acceptable in a lab.Wish they got the model of fan in this thing. Why it's not a Noctua for the price they're charging is a perplexity. I should as Amir how loud this thing gets in normal operation due to the fan...
It is loud all the time. No temperature sensitivity. I don't know why they think this level of noise is acceptable in a lab.
I put mine in a vented but enclosed rack and that helped cut the noise in half. Still, I cannot work beside it without closed back headphones.
The fans pictured in the APX are Sunon, a respectable brand. What's also interesting is they appear identical which would mean unless they are run at different speeds, they may beat/resonate. Vehicle thermo fans use two different fans with different blade counts and revolutions to create less noise.
Now add the photo where the power supply had been removed and the fan behind it has two screws turned out already I wouldn't wonder if the 'hardware work' was to exchange the fans with lower noise ones. Now the question is: are the Sunon the originals or the replacement? [Detective off]
Shit - you're the better detective.