The invention is a multi-channel loudspeaker system that provides a compact loudspeaker configuration and filter design methodology that operates in the digital signal processing domain. The toner for electrostatic image development of the invention includes a toner particle that contains at least a binder resin. The method includes transmitting a first stream with a bandwidth of 2 MHz or less. Related fabrication methods are also described. That is, the present invention provides a positive photosensitive resin composition comprising 100 parts by weight of a polyamide resin and 1 to 50 parts by weight of a photosensitizer represented by, for example, the following formula : .