Arranged vertically, the controls are as follows:
Power Indicator Light: This light glows green during normal operation and glows amber if there is a manfunction.
Volume: This is also commonly referred as Gain.
USB Port: This feature provides for connection to a PC for downloading software/firmware updates or accessing future functions.
Phase: This control matches the in/out subwoofer driver motion to the satellite speakers. This control has two positions.
Crossover: The crossover control sets the point at which you want the subwoofer to produce low frequency sounds, against the ability of the satellite speakers to reproduce low frequency sounds. This control is defeatable if using the subwoofer crossover control on a Receiver.
Trim: This control functions set optimum performance for different size rooms. If you are using the EP400, the best setting to use is FLAT. If you find that the bass response drops off to quickly, using the HALF setting will partially boost the level of low frequencies above 33Hz, while the FULL setting will greatly boost low frequencies above 33Hz. The REMOTE and LOAD settings are not currently usable, but will be accessible via future upgrades.
Proceed to the next photo for a look at the lower rear panel of the EP400.