MAudio AV40 4" Studio Monitor Speakers -=-SOLD AS A PAIR--The compact Studiophile AV 40 powered reference monitors deliver the same proven M-Audio technology favored by top producers, recording engineers and musicians around the world. The combination of 4" polypropylene-coated drivers and 0.75" ferrofluid cooled silk dome tweeters provides punchy lows, crisp highs and a balanced, uncolored response. Custom cabinets with dense wood construction deliver more accurate bass response than you could ever get from plastic multimedia speakers. And for the highest possible fidelity, the Studiophile AV 40 monitors also feature OptImage III wave-guide technology and a 20 watt-per-channel internal amplifier that utilizes Class A/B architecture.