I haven't really deceided entirely yet, but I think I'll probably run a power line from the case to the radiator box, then split it 4 ways to power each fan. I'm going to try the fans at first with full 12V to see how loud it is (they only spin at about 1300 RPM at 12V). If they are too noisy, which will probably be the case, I'll add a 1W Zener diode on the 12V line on each of the fans to drop their voltage to 7V. Those fans have been reported to be completely silent at that voltage, though they don't move much air. I'm probablt going to try to figure out a way to integrate a pump enclosure in the radiator box as well to make things a little neater, quieter, and more compact. I haven't really decided on which pump to use, though I think an Eheim 1048 will do the job, and I can always add another one inline if I switch componentas and need more head/flow. I would use a Laing DDC, but I hear those are not quiet enough for my application.
How do most people integrate power for multiple fans into their radiator box? I've considered using a small independent power supplywith a fan controller, or just running power from the PC to a fan controller. I think the diodes are better though, as they're cheaper, and I don't think I'll ever change the fan speed once it's set to a quiet level.
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