Negative amplitude means the signal is attenuated relative to a reference point, so if you see e.g. -20dB, it means the signal is 1/10th of the reference value. dB on it's own is unitless, so you will see things like dBm (relative to 1mW â 0dB = 1mW), or dBV (relative to 1V â 0dB = 1V).
In Colorado, the offer is valid at the Denver Zoo and the Denver Art Museum. However, the Denver Art Museum is Sunday only, because they already offer free admission to everyone on the first Saturday of the month. This list does change, so check the Museums on Us website, before you go.
Boo at the Zoo Event Start Date: 10/17/2015 10:00 AM. Designed for a younger audience, Boo at the Zoo offers 4 days of scare-free fun! Join our safe zoo neighborhood of Halloween entertainment, with kid-friendly fun around every corner.