Performance Optimized Down Fire Sealed 12" Enclosure | Kicker CompRT Single 12" Sealed enclosure

Because the 12 rewards the extra volume and the 10 does not. The CompRT 12 has a 52 liter Vas, so going from 0.80 to 1.25 cubic feet net drops Qtc from 1.314 to 1.137 and improves F3 from 39.5 to 35.6 Hz. That is nearly 4 Hz for about two inches of cabinet height. On the CompRT 10, with less than half the Vas, the same proportional increase buys only about 2 Hz, which is why that cabinet stays at 6.125 inches. Each enclosure is sized to what its driver actually does with the air.

No. The CompRT 12 has a free-air Qts of 0.7235, and system Qtc can never fall below the driver's Qts regardless of enclosure size. Even an infinite baffle would leave this driver above 0.7235, so no sealed box reaches a textbook 0.707 alignment with it. At 1.25 cubic feet net you are at Qtc 1.137, which produces a modest lift near the corner frequency and the punchy, forward presentation the CompRT is known for. Building larger would reduce Qtc slightly but with diminishing returns and a taller cabinet.

The 12 goes deeper, the 10 plays tighter. The CompRT 12 reaches a 35.6 Hz anechoic F3 in this cabinet, the deepest in the Down Fire line, thanks to its 30.3 Hz free-air resonance and 52 liter Vas. The CompRT 10 has a 0.618 Qts against the 12's 0.7235, so it lands at a more damped Qtc of 0.922 and gives the more neutral, controlled presentation. Cabinet height is the other factor: 8.3125 inches for the 12, 6.125 inches for the 10. Choose the 12 for extension, the 10 for control or for tight vertical clearance.

Klippel measurement of the 48CWRT124, 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.

The enclosure has one side-mounted Proline X terminal cup pre-wired in 12 gauge OFC. The 48CWRT124 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.

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 sits flat against a floor or cargo deck, 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 this shallow with a 12 inch cutout. 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 48CWRT124. The cutout and mounting depth are direct fit.