Brand new, never used! One set of two Synergistic Research XOT Carbon audio High-Frequency Transducers. We took them out of the box for taking pictures only. Hear more of what you love about your speakers. Upgrade and enhance your speaker’s performance and get more satisfaction from your music by attaching XOT Carbon High-Frequency Transducers directly to the binding posts. XOT Carbons are high-frequency filters specifically designed for your speaker’s crossovers. They scrub the nasty EM fields that adversely affect your music. The powerful XOTs clean up high-frequency noise that otherwise distorts harmonic structures within the music signal. UEF particles within the XOTs are excited by the EM fields, in turn, the EM fields become balanced by the XOTs and more phase correct information is achieved. You will hear a lower noise floor, higher resolution and a significant increase in soundstage air with improved mid-range clarity and improved low-frequency control for a more holographic and musical presentation. Retail price is 450 euro. The original box and manual are included. Check our other listings for more interesting items. Free shipping worldwide!