Proline X Performance Optimized Wedge Enclosure | Fits Kicker Solo X 18" Subwoofer

Performance Optimized Wedge | Kicker Solo X 18 18" Sealed Wedge Enclosure | Behind-Seat Wedge Design for the Kicker Solo X L7X 18 4.30 ft³ Gross4.01 ft³ NetDeepest Fc in the Line27" × 21.25" × 14.25/22"V-Groove / DadoBuilt in Tennessee The Kicker Solo X 18 in a Purpose-Built Sealed Wedge The Solo X L7X 18 is the flagship of Kicker's square-sub program: the largest cone, the heaviest motor, and power handling in excess of anything else wearing the L7 badge. Very few production sealed boxes exist for it at all, let alone one solved from the factory Thiele/Small parameters. This wedge runs the deepest profile in our PO line specifically to give the 18 real airspace. 4.30 cu ft gross internal volume produces 4.01 cu ft net after driver displacement. That lands the dual 1-ohm Solo X 18 at a punchy Qtc of 0.81 with a system resonance of 39 Hz and an F3 of 34.7 Hz, the deepest reach in the entire PO Wedge line, with the dual 2-ohm at 0.90 in the same cabinet. Behind-Seat Wedge Design Explained This is a front-firing wedge built for behind-seat and rear-wall installs. The rear panel is vertical and sits flat against the cab wall; the woofer mounts on the baffle, raked back 20 degrees to follow the seat lean. Vertical Rear Panel Sits flush against the cab back wall or trunk bulkhead, so the full footprint of the box goes to airspace instead of wasted gaps. 20° Raked Baffle Matches the lean of most factory seat backs and fires the Solo X forward into the cabin instead of into the seat. Dado-Locked Internal Brace A 3/4" brace directly behind the woofer halves the largest panel span. Its depth matches the baffle stack, so driver clearance is engineered in, not left to luck. Carpet-Wrap Ledge A recessed perimeter ledge terminates the carpet cleanly at the baffle edge for a finished, factory look. Engineered for the Kicker Solo X 18 Built to 4.01 cubic feet net. The dual 1-ohm 49L7X181 runs a Qtc of 0.81: the impact-forward zone where sealed 18s live at their best, with punch you feel in your chest and a system resonance of just 39 Hz. The dual 2-ohm 49L7X182 runs 0.90 in the same box, trading a touch more mid-bass slam for it. Both variants dig below 35 Hz at the half-power point before cabin gain even enters the math; in a truck cab this alignment plays genuinely full-range subterranean. Alignment Numbers Dual 1-Ohm: Qtc 0.81 · Fc 39 Hz · F3 34.7 Hz — Dual 2-Ohm: Qtc 0.90 · Fc 41 Hz · F3 34.0 Hz Mounting Geometry The baffle opening is CNC-cut to Kicker's published cutout spec for the Solo X 18. Mounting depth required is 11-3/8", cleared with margin at every point of the stroke, including breathing room for the vented motor. 8/32 threaded inserts pressed into the baffle backside. Sealed Alignment Response Predicted anechoic response of the Solo X 18 in this enclosure's 4.01 cu ft net airspace, computed from Kicker factory T/S parameters. This enclosure ships without a driver, so both coil variants are plotted; they do not load the same box identically. −3 dB 20305070100150200 +60−6−12−18−24 FREQUENCY · Hz LEVEL · dB D1 · Qtc 0.81, Fc 39 Hz, F3 34.7 Hz D2 · Qtc 0.90, Fc 41 Hz, F3 34.0 Hz The dashed line marks the half-power point. Roll-off below F3 is the gentle 12 dB/octave slope characteristic of sealed alignments, which cabin gain in a real vehicle substantially fills in. Run the numbers yourself with our sealed box calculator. Performance Series Construction, Driver-Specific Tuning Langboard Elite MDF Premium 3/4" MDF panels milled to documented spec. V-Groove and Dado Joinery CNC-cut V-grooves at every panel intersection. Dado joints lock the raked baffle, vertical rear panel, and internal brace into the side walls. Double-Layer 1.5" Front Baffle Two bonded 3/4" MDF sheets plus a trim layer at the driver mounting face. A Solo X 18 at full tilt is the hardest mechanical load in car audio; this baffle does not flex. Pre-Wired Terminal Cup Proline X ABS/carbon-fiber composite terminal cup, side-mounted, with 12 gauge OFC pre-wired. Finish and Trim Plush Black Carpet Every enclosure ships wrapped in plush black automotive carpet, the standard finish for the PO Wedge line. Black Acrylic Insert The signature Proline X acrylic insert comes in black. Box-Only This listing is box-only. Bring your own Solo X 18. Wiring the Kicker Solo X 18 to Your Amplifier The Solo X 18 is rated to handle up to 4000 watts RMS. In this sealed alignment, clean power at the woofer's wired impedance anywhere up to that ceiling makes a headroom-rich system; the sealed loading keeps cone travel controlled through the passband even at full output. Built in Tennessee, Backed by Audio Intensity Manufactured in Tullahoma, Tennessee on our ShopSabre CNC equipment. 1-year limited warranty. Call or text 931-563-5151. Kicker Solo X 18: The Deepest Wedge We Build 4.01 cubic feet net, solved from factory T/S for a punchy 0.81 alignment with an F3 under 35 Hz. Flagship cone area, flagship reach, in a wedge built for the back wall.