Two "Super Sound" MD-888 5-inch 4Ω Drivers for Sale. I believe they're made by Titan with a sealed back, thus eliminating the need for a sub-enclosure. Treated paper cone for natural frequency response with a protective integrated steel mesh grill. While these speakers are full-range, they can be converted into a sweet mid-range (6 dB per octave high pass filter at 4,000 Hz) by incorporating a 10μF capacitor in series with the positive lead. Used, but in good condition. Below are some of the specifications... * Model: MD-888 * Normal Impedance: 4 ohm * Cone Diameter: 4.25 inch * Cone Composition: Treated Cellulose * Surround Material: Foam * Frequency Response: 20Hz~20kHz * Sensitivity: 90dB (1w/1m) * Voice Coil Inductance (Le): 0.27 mH * Resonant Frequency: 443 Hz * Normal Amplification: 55 watts RMS * Maximum Amplification: 100 watts RMS * Speaker Frame Outside Diameter: 5 inch * Flush Mount Depth: 2.125 inch * Bolt Circle Diameter: 4.625 inch * Mounting Holes: Four * Basket/Frame Material: Steel * Magnet Material: Strong Ferrite