The JBL SRX906LA Base Plate is a universal adapter frame that enables SRX906LA arrays to be ground stacked on top of compatible subwoofers or support structures such as stages, scaffolding, or carts. Using the included M20 screw, the SRX906LA BP connects to any supported subwoofer equipped with a standard M20 pole mount adapter, such as the SRX918S or the SRX928S. The rear angle selection bar allows for angles ranging from -15 to +5 degrees. The three included M10 through-holes can be used to permanently attach an SRX906LA array to other support structures. The base plate can be used in conjunction with the Pole Mount (JBL-P3312MX) adapter to pole mount up to two SRX906LA cabinets. Configurations and load conditions for using the SRX906LA BP can be obtained using JBL Line Array Calculator 3 prediction software. For more information about the base plate and use cases refer to the SRX900 Series Rigging Manual.