A BPJ file is a simulation project created by Boxsim, an application used to simulate and test HiFi loudspeakers. It contains simulation results from testing speakers, such as frequency response and directions, directivity, phase response, and maximum SPL and input voltage.

Boxsim allows you to export simulation results in the BPJ file as an .EXP file. You can choose to export three different results: Frequency response of total speaker on axis Frequency response of one driver including influence of baffle and enclosure Frequency response of electrical signal at one driver VISATON is a loudspeaker manufacturer located in Germany. The company ranges from home HiFi to car HiFi in fields such as medical electronic equipment, computer systems, and spacecraft technology.