Performance Optimized Down Fire Sealed 10" Enclosure | Kicker CompRT Single 10" Sealed enclosure

Because of what the extra volume costs in cabinet height. At 0.80 net the CompRT lands at Qtc 0.922 with an F3 of 40.0 Hz. At 1.25 net it improves to Qtc 0.826 with an F3 of 37.8 Hz. That is 2.2 Hz of additional extension in exchange for nearly two more inches of enclosure height. On a down fire cabinet designed to fit under a seat or behind a bench, height is the constraint that matters most, so we build to the volume that keeps the box at 6.125 inches. Both volumes sit inside Kicker's published 0.4 to 1.25 range.

Klippel measurement of the 48CWRT104, not a datasheet summary. That is why this page lists parameters most retailers never publish, including Cms, Bl, Mms, Sd, Qes and Qms alongside the usual Fs, Qts and Vas. The enclosure alignment was computed directly from those measured values, so the Qtc and F3 figures reflect the driver as built rather than a nominal specification.

Two things: a 32.3 Hz free-air resonance and a 0.618 Qts. Most shallow drivers push Fs into the high 30s or 40s because a shortened motor and stiffer suspension come with the format, and many carry a Qts near or above 0.9 which locks them into an underdamped alignment in any sealed box. The CompRT avoids both. The low Fs is what lets it reach genuinely low, and the moderate Qts means it can hit a controlled alignment rather than only a punchy one. It also carries Forced-Air Cooling and a UV-resistant cone and surround, which is why it turns up in UTV and open-cab builds as often as it does in trucks.

The enclosure has one side-mounted Proline X terminal cup pre-wired in 12 gauge OFC. The 48CWRT104 is dual 4-ohm, so you set the final load at the driver: wire the two voice coils in parallel for a 2 ohm load, or in series for 8 ohms. Most single-driver builds run the 2 ohm configuration. Confirm your amplifier is stable at that load before powering the system.

Side mounted. Every Proline X Performance Optimized enclosure uses a side mounted terminal cup regardless of alignment, whether standard, wedge, or down fire. On this cabinet that keeps the connection fully accessible with the enclosure in its installed position, since the baffle faces the floor. The cup is our Proline X ABS and carbon fiber composite unit, recessed, with stainless hardware, copper ring terminals, and pre-wired 12 gauge OFC.

Down Fire cabinets are built with square corners as a series standard. The 3 inch top down corner radius used on other Proline X alignments does not apply here. A down fire box is a low, wide platform that typically sits flat against a floor or under a seat, and square corners maximize usable internal volume for a given footprint while keeping the cabinet stable on its mounting surface.

V-groove and dado joinery, CNC-cut on ShopSabre routers from Langboard Elite MDF. Every panel joint is a machined interlocking groove that mechanically locks the panels before adhesive is applied, which is what keeps the cabinet airtight under sustained pressure cycling. The front baffle is a double layer at 1.5 inches, two bonded 3/4 inch sheets, standard across the Performance Optimized Series and carrying real structural load on a cabinet only 6.125 inches tall. Perimeter cross-bracing and pre-installed polyfill complete the build. Assembled and inspected in Tullahoma, Tennessee.

No. This listing is for the enclosure only. Bring your own Kicker 48CWRT104. The cutout and mounting depth are direct fit.