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Pyramid 5 Plus Fan Silencer

A while back we reviewed the Pyramid Fan Silencer 2 which controlled noise levels for all sorts of fans within a case. Its design was well thought out, and added a few new touches to the fight against fan noise. This time we bring the Pyramid 5 Plus to you. What does it have to offer compared to its previous versions? A lot.

Original Post Date: February 2002

The Pyramid 5 Plus features are in a sense, the same, but with newer features such as auditable alarm, and able to house more fans connected to it. The Pyramid 5 Plus is a smart device that sits within your computer monitoring temperatures, and making adjustments when needed. One of the great features about the Pyramid units is their ability to slowly increase fans speeds by giving the fans more RPMs, and not ‘switching’ the fans into low, medium, or high states.

  • Sensor Temperature Response Range: 65° F to 90° F (18° C to 32° C)
  • Operating Temperature: 32° F to 167° F (0° C to 75° C)
  • Relative Humidity: 5% to 95% (non condensing)
  • Power Requirement: 12 V
  • Internal Power Consumption: 0.025 Amps (0.3 Watts)
  • Maximum DC Fan Current: 4 Amps (48 Watts)
  • Dimensions: 1.5″ X 1.5″ X 1.1″ (W X L X H)

The Pyramid does this by the thermometer located at the tip of the pyramid shape. The tip of the thermometer is actually located outside of its casing to give it ability to take measurement more accurately. If you remember our last review on the Pyramid 2 unit, we tested this to see how the fans reacted by placing our hand on the tip of the thermometer. Much to our surprise, we didn’t get any response, until we took a lighter to the tip, we got quick response expected.

So again we did the same technique to see how the Pyramid 5 Plus would respond. This time it responded to our body temperature, and started increasing the fan RPMs attached. The actual increase wasn’t much; as our body temperature doesn’t necessarily create the same effect as the inside of a case would. Within a case, temperatures can flexuate quite differently–especially when room temperature plays a huge role.

The biggest change in the Pyramid 5 Plus is, of course, the auditable alarm; which is mounted inside of the casing. If anything within the Pyramid 5 Plus fails, an alarm is sounded, an annoying one at that, too. If this were to happen, all of the fans connected into the Pyramid 5 Plus kick into their high speeds. The microprocessors within it will then try and restart numerous times in case a fans stops responding. This fail-safe mechanism also interacts with the thermometer taking measurements, ensuring everything is within tolerance.

While you do not have manual control of the Pyramid 5 Plus, as its intent is to ‘do-it’ for you without having to make all those adjustments yourself, it does work quite well within your computer case. As mentioned earlier, it is capable of handling very high powered fans on the two leads. This is done by using dPOD (Dual Power Output Driver Technology):


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