Check the listing for details. Primacoustic RX5-UF Compact Recoil Stabilizer - 10 Degree Up Fire. Condition: New. Listed at 144.99 USD. Designed for nearfield monitors, the Primacoustic Recoil Stabilizer is a unique speaker mounting device that at once eliminates disruptive resonant coupling from the loudspeaker to the stand, while providing a stable base that reduces the recoil caused by the forward energy of the loudspeaker motion.The Recoil Stabilizer is a loudspeaker platform that combines three basic components: a high-density urethane foam base to isolate the speaker from the shelf, monitor-bridge or stand; a heavy &frac1/4" laser-cut steel plate; and a thin neoprene top surface. The foam effectively decouples the loudspeaker to eliminate vibration-borne resonance that invariably introduces phase anomalies, while the steel plate introduces significant mass to the structure, stabilizing the speaker.