The LM3-F amp is a self-powered subwoofer cabinet designed to complement AP SK-F or SK-F amp touring system. It provides with an efficient solution when there is a need to reinforce the low frequencies within a flown cluster. The LM3-F amp cabinet is composed of 2 x 15 inch cone drivers mounted in a proprietary horn-loaded band pass system. This particular design reaches a high efficiency on-axis and reduces substantially the sound emitted toward the rear, which prevents from unwanted low frequency feedbacks on-stage. The LM3-F amp built-in electronics package features a new power biamplifier designed specifically for SelfPowered products.