DELTA (Chassis)

You want to buy a new chassis, and you wonder about its noise output? The DELTA ratings will help you.

We started with power supplies, and because we have the experience and the proper equipment, we decided to help users find the most suitable products for them in other categories as well. The first one we enrolled after PSUs is the chassis (AKA cases or enclosures) category. Along with power supplies, enclosures belong to among the essential parts since you keep them for many years, and most of us use them through several system upgrades. This is why it is of immense importance besides high ergonomics, to also have the best possible sound dampening performance which can also affect its thermal performance and vice versa. 

In our Chassis Noise Level database, you will find all of our chassis evaluations. We conduct all of our measurements at 23-26 degrees Celsius ambient using lab-grade equipment and a hemi-anechoic chamber, with lower than 6 dB(A) noise floor. We focus on the noise dampening performance of each chassis, which in layman's terms is to what degree the chassis lowers the noise that the system generates. Besides the noise dampening performance, we also include the noise output of the chassis' stock fan(s) at three different speeds (100%, 75%, and 50%).  

For our thermal performance tests, which are not depicted in our database since we only use them for beta testing purposes, besides measuring the noise at some fixed fan speeds, we also do the opposite. We set the fan speed at some specific levels to achieve the desired noise output. This way, it is easier to compare (and much more accurate) the thermal performance of all chassis under the same conditions. For the moment, we don't include thermal performance results in our database, but this doesn't mean that the interested users or reviewers cannot use our findings to make their comparisons and draw safe conclusions. You see, comparing the thermal performance of the same system in two different chassis with not the same fan speeds is something that won't tell you much. But if you make both chassis operate at the same conditions, under which they deliver the same noise output, it makes it much easier to find the best performer when it comes to the handling of heat loads. 

According to the noise dampening performance of each chassis, we tax it into three DELTA (Δ) categories, providing the corresponding noise certifications. This makes things easier for anyone interested in a silent system. The only thing he has to do is choose a LAMBDA-A+ power supply and match it with a chassis featuring the same DELTA rating. 
Noise Dampening LevelsNoise Dampening Requirements
A+≥6 dB(A)
A≥3 dB(A) & <6 dB(A)
Standard<3 dB(A)

Noise dampening performance example with various test tones: