Which is better for deep bass?

The NVX NSW82v3. Its 20 Hz low-end rating and 90 oz magnet give it more extension and output than the Rockville's 37 Hz rating and 30 oz magnet.

Which one fits a shallow box?

The Rockville K5 W8K5S2. Its 3.54-inch mounting depth is about 1.4 inches shallower than the NVX's 4.98 inches.

Is the NVX worth twice the price?

Yes if you have the amp and space for it. You get double the RMS power handling, a dual voice coil, and deeper bass for about $40 more.

Can I run either sub at 1 ohm?

Only the NVX. Its dual 2-ohm coils wire to 1 ohm or 4 ohms. The Rockville's single 2-ohm coil gives you 2 ohms only.

Which needs a bigger amp?

The NVX. Plan for an amp that delivers around 400W RMS at your final impedance. The Rockville needs about 200W RMS.

Do either come with a grille?

No. Neither the Rockville nor the NVX includes a grille, so buy one separately if the sub sits exposed.

Rockville K5 W8K5S2 8" 800 Watt 2 Ohm Car Audio Subwoofers CEA Rated Subs vs NVX NSW82v3 8" Car Subwoofer

The NVX NSW82v3 is the better sub for anyone who wants real output and wiring flexibility: it handles 400W RMS, has a dual 2-ohm coil, and reaches down to 20 Hz. The Rockville K5 W8K5S2 is a budget pick at 200W RMS with a single 2-ohm coil, and its shallow 3.54-inch depth fits tight spaces. Price gap is wide: the Rockville runs about $39.95, while the NVX is $79.99 at Best Buy as of November 5, 2026.

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