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Kicker has added a new top tier to its famous square subwoofers. The SoloXS L7XS comes in 12-, 15- and 18-inch sizes and is aimed squarely at very high-output and competition builds, with more than 43 mm of excursion and power handling up to several thousand watts. Here’s what’s new, plus a quick round-up of Rockford Fosgate’s busy August.
- Three sizes: 12, 15 and 18-inch, each in dual 1-ohm and dual 2-ohm versions.
- Recommended power: 1,500–3,000 W RMS (12 and 15-inch), 2,000–4,000 W RMS (18-inch).
- More than 43 mm (1.71 in) of Xmax, forced-air cooling, cast-aluminium basket.
- Field-replaceable recone kits that bolt in without glue.
- Sold through Kicker and authorised dealers; pricing wasn’t in the launch coverage.
What’s new
Kicker’s square SoloX L7X subs have been a fixture in loud builds for years, and the square cone gives more surface area than a round driver of the same nominal size. The L7XS pushes further: an oversized ferrite motor, an extra-large dual-spider suspension, a double-pressed pulp cone and forced-air cooling to keep the voice coil alive under sustained power. The 12- and 15-inch models use 3-inch aluminium voice-coil formers; the 18-inch steps up to 4 inches.
The detail we like most is the field-replaceable recone kit. Kicker uses a bolt-on spider landing and alignment pins, so the moving parts can be swapped without gluing. For competitors who occasionally cook a coil, that’s a big deal for cost and downtime.
Who it’s for (and who it isn’t)
These are serious subs. Feeding a pair of 15-inch L7XS at their recommended power means an amplifier, alternator and battery setup measured in thousands of watts. If that’s your plan, read our notes on competition subwoofers first. For a loud but sensible daily driver, Kicker’s CompR or the existing SoloX L7X 12-inch are far easier to power. See best car subwoofers.
Power reminder: at these levels, clipping kills subs quickly. Set gains with a test tone and meter, not by ear. See subwoofer clipping.
Also in car and powersports audio: Rockford Fosgate’s August
- Polaris RZR PRO-R: a subwoofer kit pairing a 10-inch, 400-watt sub with a new 1,500-watt, eight-channel amplifier for 2026 PRO-R and PRO-R Boost models.
- PMX-6BB marine receiver: a hidden media receiver that’s controlled from a boat’s multifunction display over NMEA 2000, with a 200-watt four-channel amp and independent subwoofer tuning.
- 2027 Can-Am Defender systems: vehicle-specific audio packages co-engineered with BRP, with built-in DSP.
Rockford didn’t publish pricing for these in the coverage we saw. If you’re adding bass to a car rather than a UTV, our guide to adding a sub to a factory stereo is the place to start.