Headphone accessory

A headphone accessory, comprising:

• a sound field-forming member having a cylindrical part, which supports speaker units for reproducing sound from electrical signals or supports enclosures in which the speaker units are mounted, surrounds a listener's ears and forms a space in which sound output from the speaker units or enclosures is collected into the listener's ears;
• and
• an outer casing formed of an elastic material, which can be separated from the circumference of the cylindrical part of the sound field-forming member and is directly in contact with the side of a listener's head around the ears;
• wherein the outer casing includes a band member, which is elastically closely adhered to the circumference of the cylindrical part of the sound field-forming member, and a ring coil member, which is wound in a spring coil shape and then deformed into a circle, and the ring coil member is attached to the outside of the band member.

An accessory for a multi-channel headphone, said accessory comprising:

• at least two speaker units;
• at least two enclosures adapted to be positioned in the front and back of one ear of a listener, respectively, one of the speaker units being enclosed in each of said at least two enclosures;
• a sound field forming member having a tubular part, which supports said at least two enclosures, is adapted to surround said ear of the listener, and forms a space for widening a sound field output from the speaker units of aid at least two enclosures;
• and
• an outer casing formed of an elastic material, said outer casing being removably attached to a circumference of the tubular part of the sound field forming member, and said outer casing being adapted to be in direct contact with a side portion of the listener's head around said ear.