On 8/23/21 5:26 PM, Emanuel Berg wrote:
David Christensen wrote:
Nice case. :-)
Yeah, I guess :)
The purpose of the plate at the bottom is to form
a thermally isolated chamber for the the power supply.
The unperforated portions of the top surface could be
covered with sound absorbing material.
What material would that be?
Whatever you choose. For example:
https://www.quietpc.com/acousticmaterials
And, won't it prevent the airflow and/or prevent heat from
exiting the case?
Choose the material thickness accordingly. Do not block fans or air
openings.
Conspicuously absent are drive cages; but I do see drive
case mounting screw holes. If drives are not needed, the
mounting surface could be covered with sound
absorbing material.
The HDD is below with the PSU, I think.
I got an idea, aren't the noise specified by the manufacturer?
Here it says "Low-noise operation of up to 14.9dB(A)",
that's for the Shadow Wings 2 140mm PWM.
<https://www.bequiet.com/en/casefans/1701>
The CPU fans are "Low-noise operation of up to 15.9dB(A)", the
Shadow Wings 2 120mm PWM.
<https://www.bequiet.com/en/casefans/1626>
And the non-PWM Shadow Wings 2 140mm is
"Low-noise operation of up to 14.7dB(A)"
<https://www.bequiet.com/en/casefans/1699>
So that's 4/5 fans accounted for, I have to restart the
computer to see exactly what fan the remaining is. Anyway
db(A): 14.9, 15.9 (2), 14.7
How is it with db(A), if you have x db(A) from one thing, and
you have two of these, does that mean you perceive that as
2x db(A)?
Here is the HDD BTW
$ sudo lshw -class disk
*-disk
description: ATA Disk
product: SAMSUNG HD204UI
physical id: 0.0.0
bus info: scsi@1:0.0.0
logical name: /dev/sda
version: 0001
serial: S2H7J9EB402836
size: 1863GiB (2TB)
capabilities: gpt-1.00 partitioned partitioned:gpt
configuration: ansiversion=5 guid=db8df009-609b-46e9-a61a-f2f913361b17
logicalsectorsize=512 sectorsize=512
On 8/23/21 5:50 PM, Emanuel Berg wrote:
>> db(A): 14.9, 15.9 (2), 14.7 [...]
>>
>> Here is the HDD BTW
>>
>> $ sudo lshw -class disk
>> *-disk
>> description: ATA Disk
>> product: SAMSUNG HD204UI [...]
>
> Here [1] it says "Acoustics – Idle 2.5/2.6 Bel, Performance
> Seek 2.8/2.9 Bel"
>
> So what does that mean, the maximum is 2.9 Bel or 0.29 dB?
>
> if so 4/5 fans are: 14.9, 15.9 (2), 14.7 dB(A)
>
> and the HDD is: 0.29 dB
>
> [1]
https://www.storagereview.com/review/samsung-spinpoint-f4eg-review-hd204ui
https://en.wikipedia.org/wiki/Bel_(unit)
Doubling the sound energy adds 3 db. So, the two loudest fans are
around 19 dB.
The HDD is 2.9 Bel = 29 dB.
Beyond the fan acoustic noise, there is HDD vibration. If you mount a
HDD directly to a piece of sheet metal, the sheet metal will act like a
sounding board and convert the HDD vibrations into sound. My Antec
Sonata chassis has silicon grommets and shoulder screws for mounting
each HDD into its sled. This design effectively decouples HDD
vibrations from the rest of the case. If you could implement the same
idea for your HDD or for the drive cage, that would be good.
Alternatively, you could put vibration dampers between bolted
connections and/or damp the chassis vibrations. Applying sound
absorbing pads to the inside of the case should address both sound and
vibration.
David
