Performance Optimized Down Fire Wide Sealed 10" Enclosure Focal Flax Evo P 25 FSE · Single 10" Sealed enclosure

Because it is only 12 inches deep. The standard Performance Optimized Down Fire cabinet for the Focal P 25 FSE is 30 wide by 15 deep, and this version is for spaces 3 inches shallower than that, under a rear bench or on a narrow cargo floor.

Airspace has to come from somewhere. Losing depth means recovering it along the length, so the cabinet runs 41 inches long and stands 6 inches tall. If you have 15 inches of depth, the standard cabinet is shorter in length and is the better pick; if you have 12 inches of depth and 41 inches of run, this is the shape that works.

Same driver, different shape. The standard cabinet is 30 by 15 by 6.125 inches and holds 0.754 cubic feet net. This cabinet is 41 by 12 by 6 inches and holds 0.800 cubic feet net.

The wide cabinet holds 0.046 cubic feet more, which puts it at Qtc 1.131 against the standard box's 1.149: slightly better damped, the same character. The choice is about the space you have: the standard box is deeper and shorter in length, this one is long and shallow.

Because Focal's suggested application table does not reconcile with the Thiele-Small parameters printed on the same sheet. Running their published Qts of 0.78 and Vas of 25 liters through standard sealed box math gives considerably less extension than the table claims, at every volume it lists.

The deciding factor is Focal's own frequency response graph, also on that sheet, which rolls away below roughly 45 Hz. That measured curve agrees with the computed figures rather than the table. In this cabinet the computed result is Qtc 1.131, Fc 43.5 Hz, F3 32.6 Hz.

No. The P 25 FSE has a free-air Qts of 0.78, and system Qtc can never fall below the driver's Qts regardless of enclosure size, so no sealed box reaches a textbook 0.707 alignment with it. At 0.800 cubic feet net the system sits at Qtc 1.131, which produces a lift of about 2 dB near the corner frequency.

Building larger lowers Qtc only slowly, and the cabinet height it costs is not justified on a down fire enclosure designed to fit under a seat.

Flax is a natural fiber Focal uses in place of the polypropylene or treated paper common elsewhere in this category. The appeal is stiffness relative to mass and good internal damping, which helps a cone hold its shape under load without ringing.

On this driver it pairs with a rubber surround, a 38mm four-layer copper voice coil and a glass fiber former. Whether you can hear the cone material specifically is a fair question, but the engineering behind it is real rather than cosmetic.

Straightforward, because the P 25 FSE is a single voice coil driver at 4 ohms nominal. There is no series or parallel decision to make. The enclosure has one side-mounted Proline X terminal cup pre-wired in 12 gauge OFC, and the amplifier sees 4 ohms. Confirm your amplifier is comfortable at that load and set your gain for the 280 watt RMS rating.

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.

No. This listing is for the enclosure only. Bring your own Focal Flax Evo P 25 FSE. The cutout and mounting depth are direct fit, and the feet ship uninstalled in the box.