Performance Optimized Wedge Sealed 10" Enclosure Sony XS-W104ES · Single 10" Sealed enclosure

The XS-W104ES, yes. The baffle is cut to 9.21 in (234 mm), Sony's published cutout, under the 279 mm (10.98 in) frame. Some dealer listings quote 9-1/16 in; that is 4 mm short of Sony's figure. The 5.39 inch motor clears the cabinet with 0.75 inch to spare, and Sony sells the XS-W104ES in one version, a single 4 ohm coil, so there is no variant to choose.

Any other 10, no. The airspace is engineered around the XS-W104ES's 0.49 Qts and 23.3 liters of Vas, and a different woofer that happened to drop into the hole would not see the alignment printed on this page.

It is the Butterworth volume on Sony's published Fs 39.6 Hz, Qts 0.49 and Vas 23.3 liters: system Qtc 0.707, maximally flat, with resonance and half power both at 57.1 Hz. Sony's own sheet recommends 1.01 cubic feet sealed, which reads Qtc 0.66 on the same figures; this cabinet is built to the flatter Butterworth box.

One caveat: a review sample measured after break-in read Qts 0.43 and Vas near 33 liters, looser than Sony's sheet. On those numbers this cabinet reads Qtc 0.68, a touch more damped. Either way it is a well-behaved sealed alignment.

Sony rates the XS-W104ES at 450 watts RMS to CTA-2031 and 1800 watts short-term maximum, so target 315 to 450 watts RMS at the final load.

The XS-W104ES has a single 4 ohm voice coil (3.8 ohms DC), so one driver presents 4 ohms to a mono amplifier. Confirm your amplifier's minimum stable impedance first.

The seat-side face carries a 20 degree rake that matches the lean of a factory rear seat back, so the cabinet sits flush against it and the cargo space in front stays usable. The baffle is the vertical trunk-lid-side face, so the driver fires rearward into the trunk cavity.

The trunk acts as an acoustic extension for the sealed box, and the cabin adds real output below 50 Hz, so in-vehicle response runs deeper than the anechoic 57.1 Hz on this page.

The baffle is two bonded 3/4 inch sheets, 1.5 inches through. A single 3/4 inch panel flexes under the pressure a 10 inch woofer puts on it at 450 watts, which smears output and works the driver loose over time; the second layer stiffens the face and gives the mounting hardware twice the material to bite.

The outer layer is machined as a flush recess to Sony's 10.98 inch frame, so the driver bolts to the inner layer and sits flush with the gloss black acrylic insert.

Anechoic F3 is 57.1 Hz with system resonance at 57.1 Hz. At Qtc 0.71 the response is maximally flat into the rolloff, so F3 and fc coincide.

Those figures exclude cabin gain. In a car the cabin's transfer function adds real output below 50 Hz, so in-vehicle response runs deeper than the numbers above.

No. Polyfill is already installed as a light wall lining to control internal reflections, and the quantity is chosen so it does not change the acoustic volume.

Do not add more. Packing a sealed box with fill makes it behave as though it were larger, which walks the alignment away from the 0.76 cubic feet this cabinet was built to.

No driver. This is an enclosure only. You receive the cabinet finished in plush black carpet with the gloss black acrylic baffle insert, one side-mounted pre-wired terminal cup, the polyfill lining already in place, and a threaded insert kit with stainless machine screws.

The inserts ship loose on purpose: Sony prints no bolt circle for the XS-W104ES, so you set the driver in the recess, mark its holes, drill and press the inserts. The Sony XS-W104ES is purchased separately, and the cabinet is cut direct fit to it, not a general purpose 10 inch box.