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The Rockville K5 W8K5S4 is a single 4-ohm 8-inch car subwoofer rated at 200W RMS and 800W peak, built for small sealed or ported boxes. Its shallow 3.54-inch mounting depth and 7.16-inch cutout make it one of the easier 8s to fit in tight spaces like truck cabs and hatch corners. Sensitivity is modest at 85.7 dB, so it wants real amplifier power rather than a head unit's built-in output. Against pricier 8s from established brands it trades refinement and long-term durability for a low entry point and flexible enclosure options.
In stockSold by AudiosavingsReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
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Lowest price we've seen: $39.95 on Nov 10 at Amazon. Tracked across 1 store since Nov 10.
Buyers who pair it with a proper amp and a correctly sized box report decent output for an 8, while others note it runs out of excursion and sounds strained when pushed hard.
Rockville W8K5S4 is a 8 in car audio subwoofer based on the supplied product specifications. The listing covers one primary product. The product name and configuration are kept aligned with the model, quantity, and application stated in the source. Performance: The published peak power handling is 800W, RMS power handling is 200W, program power is 400W. Impedance is listed at 4 Ohm with a single voice coil configuration. The specified frequency response is 37 Hz to 1.3 kHz. Loudspeaker sensitivity is listed at 85.7 dB. These are the stated performance values for the primary product and are presented without combining ratings from separate bundle accessories. Installation: The source lists a 7.16 in cutout and 3.54 in mounting depth. Recommended sealed enclosure volume is 0.35 to 0.85 cu ft. Recommended ported enclosure volume is 0.6 to 1.2 cu ft. Use the published measurements and fitment notes to confirm clearance, speaker opening, and enclosure placement before installation. Construction: The primary driver construction lists a Cast Iron basket, non-pressed paper cone, foam surround, paper dustcap. The voice coil is specified as 1.5 in 4 layer Black Aluminum Voice Coils. The motor assembly includes a 30 oz magnet. Connection hardware is listed as Chrome plated binding posts. Only construction details explicitly present in the supplied description are carried into this listing. Application: The primary subwoofer is identified for vehicle audio use in the supplied product data. Use the stated RMS rating, impedance, mounting measurements, and enclosure guidance when matching the primary driver with compatible system components.
