The present disclosure discloses a loudspeaker apparatus. The loudspeaker apparatus may include a circuit housing accommodating a control circuit or a battery; an ear hook and a rear hook connected to both ends of the circuit housing, respectively. The ear hook may be at least partially covered by a first protective housing. The rear hook may be at least partially covered by a second protective housing. The first protective housing and the second protective housing at least partially cover a periphery of the circuit housing from both ends of the circuit housing in a sleeve manner, respectively. The loudspeaker apparatus may further include a speaker connected to one end of the ear hook, the speaker including an earphone core and an earphone core housing for accommodating the earphone core. The earphone core housing may include a housing panel facing the human body and a housing back opposite to the housing panel. A vibration of the earphone core may result in vibrations of the housing panel and the housing back. The vibration of the housing panel may have a first phase, and the vibration of the housing back may have a second phase. When vibration frequencies of the housing panel and the housing back may be in 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. The loudspeaker apparatus of the present disclosure can avoid damage to the control circuit or the battery caused by high temperature.