Bitcoin accepted at checkout | Ships from Montreal, QC, Canada | Expert support since 2016
$65.99 CAD
The tuned tier. Version 2 keeps the reactive expansion chamber of the original and adds a quarter-wavelength side branch — a closed stub whose length is chosen so that sound at its target frequency arrives back in the main duct out of phase with itself and cancels.
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The tuned tier. Version 2 keeps the reactive expansion chamber of the original and adds a quarter-wavelength side branch — a closed stub whose length is chosen so that sound at its target frequency arrives back in the main duct out of phase with itself and cancels.
Same intake as the v1: the rear 120 mm fan pair on the Antminer S19 series and standard Antminer S21. Not for the S21 Pro or XP. Standard 6-inch collar. It is dimensionally a drop-in alternative to the v1 in terms of how it connects, though the body itself is taller.
Measure before you order. Fit dimensions in this line are derived from published fan and chassis geometry and are not yet validated against measured production hardware. Check your flange size and the clearance around your machine against the footprint in the specifications below. If something does not fit, tell us — that is how the next revision gets better.
Installs like the v1 silencer. The side branch is internal to the body, so nothing changes about how you clamp the duct — you simply need more room behind the machine than the v1 needs. Check clearance before ordering.
A plain expansion chamber works broadly but shallowly. A quarter-wave branch is targeted: pick a frequency, cut a stub a quarter of that wavelength long, and get a deep notch right there. Fan noise has a strong tonal component at the blade-pass frequency, which makes it a reasonable target for exactly this trick. The idealised model for this branch predicts a notch in the region of 750 Hz. That model is idealised and unmeasured — we have not put this on an acoustic bench, we publish no decibel figures, and we are selling it as the premium tuned option rather than as a proven upgrade over the v1.
| Fits | Antminer S19 series and standard Antminer S21 — rear 120 mm fan pair |
|---|---|
| Intake | 2 × 120 mm fans |
| Outlet | 6″ duct collar |
| Footprint | 250 × 217 × 236 mm |
| Material | PETG |
| Construction | Single continuous body — no assembly, no fasteners, no glued joints |
| Design files | Open source — free to download, use, modify and redistribute |
| SKU | DC-SIL-D120-6-V2 |
Every shroud D-Central designs is released as an open file. The geometry for this part is free to download from our 3D models download center: use it, modify it, remix it, run it in your own shop, sell what you make from it. There is no licence to buy and no design gated behind a purchase. Shared knowledge is the whole reason this industry has open hardware at all, and we are not going to be the ones who stop passing it on.
This listing is for the finished part: made to order in PETG and shipped from Montreal, Quebec. If you would rather have it in your hands than spend an evening making one, buy it here — that is what pays for the next design in the line. You can also support the open-source work directly through D-Central’s fund page.
See the full D-Central shroud and ducting system for the compatibility matrix and sizing guide.
On paper, at its tuned frequency, it should be. In measured reality, we do not know — neither version has been through an acoustic test. We are telling you that plainly rather than putting a number on a box. If you want the design that theory prefers and you have the clearance, take the v2. If you want the smaller, cheaper part, the v1 is not a lesser product, just an untuned one.
A closed-off stub off the side of the main passage, cut to one quarter of the wavelength of the frequency you want to kill. Sound travels down it, reflects off the closed end, and returns to the main passage half a wavelength later — out of phase, so it cancels. It is a standard technique in exhaust and HVAC acoustics; nothing exotic.
Because that is roughly where the tonal content of a fan of this size and speed sits. The exact figure comes from the idealised model of this geometry, not from a measurement of this part in service, so treat it as design intent rather than a specification.
A side branch is a dead-end volume rather than a restriction in the main path, so in principle the penalty is small. Unmeasured, like everything else acoustic on this part.
| Weight | 430 g |
|---|---|
| Dimensions | 25 × 21.7 × 23.6 cm |
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