sE Electronics GUITARF-U Dual Mic RF Isolation FilterThe guitaRF combines a professional reflexion filter with dual mic mounting to give live sound engineers and studio recordists precise control over guitar cabinet and instrument miking. Built with vented composite outer shell, acoustic grade wool, air gap isolation, and inner foamthe same construction philosophy as sE's RF Xit cuts stage bleed during multi track live recording and reduces room reflections in tight studio spaces where separation