Provided are a supported metallocene catalyst, a method for preparing the same and a method for preparing polyolefin using the same. Thereby, the integral lead wire arrangement provides the speaker spider with an enhanced durability, higher sound quality and improved safety, so as to enable a speaker to be manufactured by less steps in a lower cost while achieving a higher quality in comparison with the conventional speaker structure. The power supply provides power signals. A protocol request message is then sent from the connection manager to the server over the secure connection. The first end and the second end are associated with each other.