The present disclosure discloses a loudspeaker apparatus. The loudspeaker apparatus may include an ear hook including a first plug end and a second plug end, a core housing for accommodating an earphone core, and a circuit housing for accommodating a control circuit or a battery. The ear hook may be surrounded by a protective sleeve which is made of an elastic waterproof material. The core housing may be fixed to the first plug end and elastically abutted against the protective sleeve. The core housing may include a housing panel facing human body and a housing back panel opposite to the housing panel. When the vibration frequencies of the housing panel and the housing back panel is within a range of 2000 Hz to 3000 Hz, an absolute value of a difference between the first phase and the second phase may be less than 60 degrees.