The 830855 SDS Series 4" woofer from Tymphany is perfect for use as a woofer in small format 2-way speakers, a mid in 3-way speakers, or as a compact subwoofer.
Peerless by Tymphany SDS-P830855 4" Woofer Treated Paper SDS Woofer
The SDS compact woofer family offers low resonant frequency performance, ideally suited for compact sealed enclosures. This 4 inch 8 ohm member of the SDS family offer a coated paper cone with rubber surround, a high power voice coil suspended in a ferrite magnet motor, and a narrow-profile steel basket shaped to fit into narrow cabinets.
Data sheet