JBL Active Subwoofer
This is a lightweight subwoofer by JBL with a power of 1,500 watts, a Class-D power amp, heavy-duty Dual Coil Drive woofer and DSP.
Lurking inside the JBL SRX818SP subwoofer is an 18-inch woofer that is perfectly capable of bringing forth the bass in your mix loud and clear. It is capable of an SPL of no less than 135 dB and a frequency as low as 29 Hz.
JBL's SRX828SP active subwoofer is equipped with two 18-inch woofers, a proper housing and a Crown amplifier that pushes it to an SPL of 141 dB at frequencies as low as 29 Hz!