Pioneer SP-FS52 Andrew Jones Designed Floor standing Loudspeaker (each) Highly acclaimed and award winning series of speakers RF Molded Curved Cabinets to reduce internal standing waves Three 5-1/4 Structured Surface Woofers with oversized magnets and vented pole pieces for improved bass response 1 High Efficiency Soft Dome Tweeter for smooth high frequency reproduction even at high volume levels 8 Element Complex Crossover perfectly blends audio between the woofer and tweeter for greater accuracy