Hi,
I've purchased 10 UCD400 OEM units which have a aluminium L bracket and a small (about 1cm high, 8x7cm) heatsink attached to it. 8 of those will be powered by one SMPS3KA400, another 2 in stereo by some chinese 600W smps.
Furthermore 2 standard UCD2K units (they have some limited cooling on the board) powered by 1 SMPS3KA700 for my stereo subwoofers.
Looking at pictures from other builds, I seldomly see added heatsinks for cooling on SMPS or on UCD400 units. UCD2K builds are more rare, but passive or active cooling is used more often. Reading the specifications though, they do recommend cooling of the unit. I would like to use passive cooling instead of active due to the noise.
The use will be for a home theatre, not at reference levels, so not running 'full blast'
I am wondering about cooling as I'm ordering cases for them (modu) and am contemplating either using the Sepante or Dissipante line. The Sepante line is a lot bigger inside, which gives plenty of options to add some cooling. They also have an option to add a fully ventilated top cover, which the dissipante does not have.
I used this online tool to calculate:
https://celsiainc.com/resources/calculators/heat-sink-size-calculator/According to this, a heatsink should be 5 cm high (fins, 8x8cm) for the UCD400 if using 300W. For the UCD2K consuming 500W it should be 10x15x5 (high). Especially for the SMPS I'm not sure if extra passive cooling is required. I'm leaning towards adding only 1 heatsink to the UCD2K. I would think this is sufficient (can cut in 2, one for each UCD2K)
https://www.audiophonics.fr/en/kits...lack-anodized-300x125x50mm-black-p-10871.html
I wonder about cooling:
Thanks a lot!
I've purchased 10 UCD400 OEM units which have a aluminium L bracket and a small (about 1cm high, 8x7cm) heatsink attached to it. 8 of those will be powered by one SMPS3KA400, another 2 in stereo by some chinese 600W smps.
Furthermore 2 standard UCD2K units (they have some limited cooling on the board) powered by 1 SMPS3KA700 for my stereo subwoofers.
Looking at pictures from other builds, I seldomly see added heatsinks for cooling on SMPS or on UCD400 units. UCD2K builds are more rare, but passive or active cooling is used more often. Reading the specifications though, they do recommend cooling of the unit. I would like to use passive cooling instead of active due to the noise.
The use will be for a home theatre, not at reference levels, so not running 'full blast'
I am wondering about cooling as I'm ordering cases for them (modu) and am contemplating either using the Sepante or Dissipante line. The Sepante line is a lot bigger inside, which gives plenty of options to add some cooling. They also have an option to add a fully ventilated top cover, which the dissipante does not have.
I used this online tool to calculate:
https://celsiainc.com/resources/calculators/heat-sink-size-calculator/According to this, a heatsink should be 5 cm high (fins, 8x8cm) for the UCD400 if using 300W. For the UCD2K consuming 500W it should be 10x15x5 (high). Especially for the SMPS I'm not sure if extra passive cooling is required. I'm leaning towards adding only 1 heatsink to the UCD2K. I would think this is sufficient (can cut in 2, one for each UCD2K)
https://www.audiophonics.fr/en/kits...lack-anodized-300x125x50mm-black-p-10871.html
I wonder about cooling:
- UCD400 uses much less power in idle, less than 10W, and is pretty efficient. Would the smallish heatsink be sufficient or should I add more cooling? I would put all of them on one L shaped aluminium bracket, so the heatsinks would be connected and thus 'shared'.
- UCD2K uses more power in idle, 35W, so will get hotter even if not used. Would adding a heatsink be needed for subwoofer use?
- SMPS3K power units: is the onboard cooling sufficient? They will be pushing quite some boards, 70-80W in idle and 2-3kw in full use all channels, though realistically in continuous use it will be about 1000W in normal use.
- Case height. The UCD400 is only 8 cm high (on its side), so a 3U case has 12cm height and thus 4cm 'clearance'. The UCD2K is 11cm high on it's side, so only 1cm clearance in 3U case. Should I go to a 4U case and put it on it's side, or put it 'flat' and add a 'L' so I can add the heatsink on the side? The footprint in the case would be quite large in that case, 20x11cm (heatsink 5cm) compared to 14x9 if put on it's side (but higher!).
Thanks a lot!
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My ucd400oem in modushop case runs for more then a decade. Just mounted on the metal bottom plate.
But ucd400oem on small heatsink with 1000w smps on bottomplate also functions.
But ucd400oem on small heatsink with 1000w smps on bottomplate also functions.
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Ok, thanks, so no need to worry about the ucd400 or the smps! I think I might need to add some extra cooling to the ucd2k though as it looks very small, the heatsink standard on the board.
Very nice tube opamps, love the "eyes" you have now on the front plate!
Very nice tube opamps, love the "eyes" you have now on the front plate!