VXF-15 | 15" 3,000 Watt Max Power Car Subwoofer | Skar Audio
STLF-18500A | 18" Cast Aluminum Frame High-Power Raw Woofer Speaker, 1 – Sound Town
Parts Express - WOW! 30% OFF?! With a large roll surround, high excursion, and low Fs for its size, the Peerless SLS-P380945 5-1/4" subwoofer is ideal for use in extremely compact subwoofer
What Is Speaker Fs? (Fundamentals explained) - Loudspeaker & Acoustic Engineering Design