System installers in search of a powerful, flexible amplifier with Hi-Z and Lo-Z capabilities should check out the Lab.Gruppen C 28:4, a 2 RU, four-channel 2800W amplifier that's designed to power anything from one massive subwoofer or a series of small 100V loudspeakers. The amplifier is well suited for retail, hospitality, night clubs, bars, performing arts centers, convention centers, hotels, theme parks, houses of worship, and more. The C 28:4 utilizes Class-TD technology, which delivers the exceptional efficiency of Class D while retaining the superior sonic quality of the best Class-AB output stage.