This 100 – 300 Watts RMS REDLINE SW Series Subwoofer is Ideal for Sealed and Small Vented Enclosures on Low to Moderate Power Levels. The REDLINE SW Series subwoofers offer extreme bass and value. These Hi Def Tuned subwoofers work great in sealed and small vented enclosures, on low to moderate power levels. They’re equipped with all the performance features needed to handle the rigors of daily pounding, and they are available in two impedance options so they can be matched to any DD Audio amplifier SOLID PERFORMANCE. SIZABLE SAVINGS.