Noise Damping & Output Measurements Methodology
We use a Class 1 Bruel & Kjaer 2270 G4 sound analyzer equipped with a Type 4955a microphone with a dBA-weighted dynamic range of below 6 dBA and up to 110 dBA. All tests are conducted inside a hemi-anechoic chamber with a noise floor close to 6 dBA and at 25–28 °C ambient. The test subject is placed a meter from the sound analyzer. Before we start the measurements, we calibrate the sound meter using the Bruel & Kjaer Sound Calibrator Type 4231.
Noise Damping Test Procedure
We place a speaker in the measuring position in which we measure its intensity at the following frequencies: 100Hz, 250Hz, 500Hz, 1KHz, 2KHz, 3KHz, 4KHz, 5KHz, 6KHz, 7KHz, 8KHz, 9KHz, 10KHz, 11KHz 13Kz, 12KH 14KHz, 15KHz, 16KHz, 17KHz, 18KHz, 19KHz, 19.5KHz, 20KHz. We also measure the Chirp signal, Pink and White noise. We use the above measurements to reference the speaker’s volume in the open air.
To ensure the same conditions are present in each measurement, we install the chassis vertically in the chamber to the microphone in the intended position. Next, we install the speaker we measured in an open field inside the chassis. We place it close to the side where the microphone points without touching the side panel. At the same time, we pay close attention to having the speaker as close as possible to the chassis floor (see photo below).
Noise Output Test Procedure
We did not use any additional fans in this chassis and did not measure fan noise.
Nonetheless, we took noise measurements of the graphics card. We use a Galax RTX 4060 EX graphics card in all builds. In this test, we install it in the chassis, activate the system, and turn off all the fans except those used by the CPU and GPU cooling systems. We keep the CPU’s fan speed at the lowest setting to not alter the measurements and change the speed of GPU fans to 40%, 50%, 60%, 70%, 75%, 80%, 90%, and 100% while measuring and logging noise output.
