Yamahas compact NS-AW150 bookshelf speakers provide an affordable way to enjoy your music or television programming on a deck or under a porch. You can bring them in during the cold months and set them up indoors too: their high build quality and good sound lend them equally well to two-channel indoor listening. The speakers which are sold as a pair each use a 5-inch high-compliance polypropylene mica-filled woofer and 5-inch PEI dome tweeter. The drivers are optimized for high rigidity but low mass giving them reasonably high sensitivity (80 dB with 2.83V at 1 meter) another way of saying modest amplifiers wont have much trouble driving them. Their acoustic-suspension cabinets are sealed to prevent undue resonance or tubby tuneless bass which often results from low-cost ported designs. With a nominal impedance of 6 ohms the speakers will work nicely with amplifiers up to 35 watts per channel nominal or 120 watts peak power. They boast a frequency response of 80 to 40000 Hz (+/-3 dB) giving you decent bass output for their compact size and unusually extended high-frequency response for your most demanding digital media. For indoor use you may want to augment their performance with a subwoofer to deliver deeper and more powerful bass; be sure to select one with a variable crossover so you can tailor its upper frequency to effectively "take over" at the point of the NS-AW150s lowest deliverable frequency. The speakers are magnetically shielded so you can place them on or near a TV or video monitor without fear of picture degradation from their magnetic fields. Five-way binding posts simplify connection with several different terminations of speaker cable (including banana plugs) and the NS-AW150s even come with two lengths of cable to get you started. While you wouldnt want to leave the speakers exposed on say the deck of a boat they are water resistant and designed to withstand light wind and rain--a benefit of their sealed enclosures and rugged metal grilles. The speakers come with mounting bases and brackets. Whats in the Box: Two speakers two lengths of speaker cable speaker bases mounting brackets a warranty card and a users manual.