What are the SRH240A Headphones best suited to? The SRH240A is the entry to the Shure professional headphone series and is ideal for use with your personal MP3 player and other general listening applications. What are the features? It has a closed-back, circumaural design that rests comfortably over the ears which reduces background noise. A wide frequency range delivers full bass and clear mids and highs and is optimized for use with most pro and consumer audio devices.