JBL JRX 218S is an 18-inch passive subwoofer with up to 350W / 4Ω and max SPL 133dB, sensitivity 98dB with 34Ηz-250κΗz frequency response. It has a wooden enclosure and a SS3BK pole-mount socket on top.
The Modern Acoustics LA-300sub is a passive subwoofer with 2 x 15 inches woofers with power rating 1000W (RMS). It has an integrated metal suspension system from a trass (via bumber) and can be a complete line array system (stacked or suspended) in combination with the LA-100 satellite.
It is made of Baltic birch and is painted with very high resistance polyurethane paint and screen with epoxy treatment. It is connected via speakon NL4 connectors on the back.
Modern Acoustics Hammer12p - professional passive subwoofer 15 inches with power 450 W RMS / 1800 W Peak, frequency response 32 Hz - 200Hz (± 10dB), 129dB max SPL (peak), sensitivity 97dB. Cabin: black color, with two handles for easy carrying and speaker holder Dimensions (H x W x D): 600 x 560 x 420 Weight: 24,3 kg