Output Noise
I 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 an ambient temperature of 25–28 °C. The test subject is placed a meter from the sound analyzer.
Full & 70% Speed
Noise output is increased compared to the “plain” version.
Speed (Percentage) – Noise
I use a different setup to drive the fan for noise measurements, so there might be a difference in the readings of the Longwin machine, especially in the max fan speed reading.
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even the LS variant spins nearly 2x too fast for most uses if you care about noise so existence of this variant is bizarre to say the least
and if you want performance at all costs T30 or some monster from Delta will be your friend
The T30 is a monster, for 30mm thickness.
it’s a weird one, extra thickness and top speed make it less fit for the consumer grade, but it isn’t going as far as industrial/server fans relying on the brute force and thickness alone as it uses better materials and tight tip clearance like Noctua does
probably makes most sense when you don’t want to build a rack but have a technical room to put the machine in and just run these at full speed to not worry about anything
at low speeds it’s fine for regular use if your PWM controller doesn’t make it stop despite using it in performance or advanced mode (hybrid stopping at 50% makes no sense imo as that 50% is still loud) but requires some extra space and you won’t be using that extra speed at all