Two Source, 6.5", Amplified Drop Ceiling Speaker on a 2X2 tile and backcan assembly delivers up to 40 watts power directly to the speaker. Each powered speaker (2X2VG-HDTR61) can drive three additional speakers (2X2VG-IC6NA). Lower noise feature and protection from shorts and overheating. 15 Volt DC Level 5 power supply included and optional Volume Controls are available.