The closed around-ear design of HD 451 delivers stereo sound with powerful punchy bass and reduces ambient noise. The HD 451 offers vibrant stereo sound with powerful bass response as well as highly appealing aesthetics all in one compact package. Its state-of-the-art transducers deliver clear, vivid sound reproduction, and the closed, circumaural design helps to shut out disturbing ambient noise for maximum listening pleasure in a variety of listening environments. Furthermore, the single-sided cable virtually eliminates tangling, thus guaranteeing improved freedom of movement on the go. Sennheiser’s HD 451: For outstanding stereo sound that you can enjoy anywhere.