A method for producing a toner, that can produce a low temperature fixable toner in a stable manner, a toner produced by the production method, a two-component developer using the toner, a developing device and an image forming apparatus are provided. An echo canceller determines delay characteristics that are associated with the received voice signal and correspondingly modifies echo cancellation processing. A void is formed in at least a part of a space between the sealing material and the light-transmitting member.