The T51i delivers unrivalled sound quality. With the new and improved drivers, the headphones deliver in an inspiring way - right from the first moment. A particularly deep bass response and transparent, clear highs are apparent from the T 51 i due to the common properties that make all Tesla headphones so special: high efficiency and low distortion. The result: a clear, powerful sound across the entire frequency range, even at low levels. The closed design of the T 51 p also isolates external noise very effectively.