The XBA-4 is the flagship model in the Sony XBA line -- it employs four balanced armature drivers (full range, tweeter, woofer, and superwoofer drivers) in each earpiece.

They come with four sizes of silicone ear tips and three sizes of noise-isolating tips, making it easy for users to find the proper size to achieve that all-important fit. With excellent noise-blocking performance, a comfortable fit, and a sleek design, the XBA-4s are sure to satiate any audiophile's hunt for a balanced in-ear headphone