Performance Optimized Down Fire Wide Sealed Dual 10" Enclosure Sony XS-W104ES · Dual 10" Sealed enclosure

Because it is only 12 inches deep. Our standard Performance Optimized Down Fire cabinet for this driver is 30 wide by 15 deep, and this one is built for spaces three inches shallower than that, typically under the rear seat of a truck or SUV 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 9.625 inches tall, and still keeps each driver in a properly sized separate chamber. If your space is wide and shallow rather than deep, this is the shape that works.

Same driver, different shape. The standard cabinet is 30 by 15 by 10.3 inches and holds 0.76 cubic feet net per driver. This cabinet is 41 by 12 by 9.625 inches and holds 0.765 cubic feet net per driver.

That is effectively the same airspace, so acoustically the two are interchangeable. Choose on the space: with 15 inches of depth the standard cabinet is the pick; if depth stops at 12 inches and you have 41 inches of run, this one fits.

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, and the 5.39 inch motor clears the top panel with 3.48 inch to spare. Sony sells the XS-W104ES in one version, a single 4 ohm coil, so there is no variant to choose; run two so the chambers match.

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 maximally flat volume on Sony's published Fs 39.6 Hz, Qts 0.49 and Vas 23.3 liters: Qtc 0.706, Fc 57.1 Hz, F3 57.1 Hz anechoic, with resonance and half power at the same frequency. Sony's own sheet recommends a larger sealed box, which reads more damped on the same figures; this cabinet is built to the flatter Butterworth box.

Displacement is our estimate, since Sony publishes none, and a review sample measured after break-in read looser than Sony's sheet. Treat the Qtc as good to a few hundredths either way.

Sony rates the XS-W104ES at 450 watts RMS per driver to CTA-2031 and 1800 watts short-term maximum, so target 315 to 450 watts RMS per driver at the final load. Each has a single 4 ohm voice coil (3.8 ohms DC).

Two in parallel through the shared cup present 2 ohms; two in series present 8 ohms. Wire both the same way and confirm your amplifier's minimum stable impedance first.

The cabinet is 9.625 inches tall measured in the down fire position, and that figure excludes the standoffs. The standoffs hold 1.75 inches under the baffle, so plan your space around a finished stack of 11.375 inches.

The footprint is 41 inches wide by 12 deep, sized for under a rear seat or a narrow cargo floor. If you have 15 inches of depth, the standard 30 by 15 cabinet is the better shape.

No. Polyfill is already installed in both chambers 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 0.765 cubic feet per chamber this cabinet was built to.

No driver. This is an enclosure only: you receive the cabinet finished in plush black carpet, one side-mounted pre-wired terminal cup, the polyfill lining already in place, the standoffs, 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 pair of Sony XS-W104ES is purchased separately.