The PolyPlanar 4-Channel Audio Amplifier features a compact, water resistant design that allows for flexible mounting possibilities.
The control keypad is designed to withstand installation in the gas zone of a portable spa and is equally suited for use in a marine environment
The unit accepts either audio streamed via Bluetooth connection or hard wired input via RCA input. The waterproof control pad is easily mounted as the body of the keypad is threaded and the large mounting nut is tightened against the back side of the mounting surface.
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|ME60BT||4-Channel Audio Amplifier, With Bluetooth, 120W||
A few years ago, a pulse flow was released into the Colorado River Delta per Minute 319 of the U.S.-Mexico Water Treaty of 1944. The flow began March 23, 2014 and ended on May 18, 2014, pushing around 130 million cubic meters of water downstream. A few months after that, this magazine checked in with some of the scientists involved in monitoring the effects of the pulse flow. Investigators told us they had deployed more than 100 piezometers to study groundwater levels. Flow trackers were giving them discharge data and measurements on salinity were being gathered with conductivity probes. For gauging the impacts to waterfowl, the researchers were using stereos to send out mating calls while listening for responses. But there was so much more data collection underway than we knew.Read More
It’s pretty easy to find a Lake Erie infographic these days. And that makes sense, because the water body is an incredibly important one. We laid out some of the dynamics that make it that way in our most recent print edition, published in fall 2016 . Those include its shallow depth, a factor that makes it one of the most productive Great Lakes both for fish and algae. Another is the population surrounding Lake Erie. Did you know that the Erie watershed has nearly 12 million people? That makes it the most populated area of the region! In our latest edition, the Lake Erie infographic serves as a nice background for readers who may be unfamiliar with the lake. It also helps to introduce our coverage of Lake Erie’s western basin.Read More
Following water level declines in lakes around the Twin Cities area of Minnesota, scientists at the U.S. Geological Survey were interested in identifying the cause. What they found along with that was a large degree of variability between the lakes, based on geology, elevation and land use. That there was such variation isn’t too surprising, as Mother Nature is far from neat in laying things out. But the sheer size and scope of the study has a nice way of underscoring just how different individual lakes can be from one another even if they sit nearby. The effort, looking at 96 different lakes around Minneapolis and St. Paul, Minn., found wide variation in water levels over time. Some lakes gained in water levels while others nearby saw them decline.Read More