Synergistic Research HT Carbon Headphone Transducer, Each

Synergistic Research HT Carbon Headphone Transducer Product Description: 

The HT Carbon Headphone Transducer offers a simple way to lower the noise floor of any headphone system. Housed in a new carbon fiber enclosure and featuring a second-generation headphone UEF filter, it significantly enhances the performance of every pair of headphones. Additional refinements, including a redesigned plug, make the HT Carbon compatible with headphone amplifiers that have recessed headphone outputs, ensuring both convenience and superior sound quality.