Voice coil assembly for speaker

A speaker, comprising:

• a vibration system including a vibrating diaphragm and a voice coil assembly for driving the vibrating diaphragm;
• a magnetic circuit system including a first permanent magnet and a second permanent magnet, which are separated with opposite magnetic poles thereof facing each other;
• a magnetic gap formed between the first permanent magnet and the second permanent magnet for partially receiving the voice coil assembly;
• wherein
• the voice coil assembly includes a voice coil wire in flat and annular shape and a pair of voice coil brackets, each of the pair of voice coil brackets having a first wall, a second wall opposite to the first wall and a third wall positioned between the first wall and the second wall, the third wall fixed on the vibrating diaphragm;
• the voice coil wire is sandwiched between the first wall and the second wall of the pair of voice coil brackets.