The Apollo Smart Color scroller is pretty good about being silent if the scroll mode is set to a slower speed, how ever, if you have them set at high speed you will sometimes even hear something that sounds like ripping gels while the scroller is moving from color to color. Other wise, the Smart Color scrollers are literally whisper quite.
The apollo scrollers are dead silent with the exception of the fan noise when set to low fan and slow speed. However, they are VERY slow when set to this (30 sec head to tail).
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