Two Frequency Division Active Speaker for Outdoor Stage Platform Active S1000W Powered Speakers From Edifier The Audiophile Man Amazon.com: Majority D40 Active Bookshelf Speakers Powered Stereo Alto Profesional Audio TS415 2500 WATT 15 INCH Active Speaker With. Active Speaker Connect your compatible VHF radio to a handset for on board communication. The active speaker has a knob to adjust volume up or down as needed on the compatible handset. WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings. ca. gov.