Professional Series Ported 12" Enclosure One Audio RSq3 · Single 12" Ported enclosure

One Audio publish a Qts of 0.45 for the RSq3 D2 and 0.47 for the D1, and both hold up: each column's Qes and Qms reproduce its own Qts, the two coils agree on Vas to within a percent, and Fs, Vas and Sd give back the moving mass they print. At 36 Hz, F3 is 29.5 Hz with 5.45 dB of passband ripple. The box is voiced for output: with cabin gain the low end rises well above the midbass, so expect deep, heavy bass rather than a flat in-car curve. At 1800 watts the cone uses 12.1 of its 32 millimetres and the port mouth runs 16.9 metres per second, under the 17 where a slot starts to chuff. Tuning is chosen for in-car response rather than an anechoic curve: a vehicle adds roughly 12 dB per octave below about 45 Hz, and this tuning is where that sum comes out flattest across 25 to 60 Hz.

Every driver is run through the Performance Optimized wedge and down-fire before this chassis; the Professional box is where a driver lands when that smaller envelope, 30 inches wide and 18 inches deep with a triangular side port, cannot give it what it needs at its rated power. The RSq3 did not clear the port gate there. The calmest wedge port that fits that envelope is 24.7 square inches at 29.5 by 12.25 by 17.89 inches, and its mouth runs 22.8 metres per second at 1500 W against the 17 metres per second line where a port starts to chuff. That port would stay clean to about 834 W. The slot on this box reaches 39.9 square inches and holds the mouth at 16.9 metres per second at 1800 W. An under-ported box does not fail quietly. Air speed at the mouth rises with power; past the chuff line the flow turns turbulent and the port is audible on every note. The turbulence also chokes the port, so the box behaves as if it were tuned higher than it is, loses output near tuning, and lets the cone travel further below tuning than the design allows. This chassis is a full-size front-firing box on a 2.25 inch baffle built from three 3/4 inch layers with the woofer flush-mounted in the outer layer, an One Audio logo acrylic, and a port and excursion budget checked at 1800 W. It carries a 2 year warranty, against 1 year on the Performance Optimized lines.

One Audio does not publish the mounting hole locations for the RSq3, so we cannot install the threaded inserts before it ships. The threaded insert kit comes in the box instead: inserts sized to the woofer, the correct drill bit, 2.5 inch allen-head screws, an allen key and woofer gasket tape. You set the inserts when you mount the woofer, and this box ships with one kit.

Yes, at 28 Hz, 24 dB per octave. Below tuning a vented box stops loading the cone and excursion runs away toward DC. With the filter in place this cabinet puts the One Audio RSq3 at 38 percent of its usable travel at 1800 W.

Below about 26 Hz, yes. The sealed wedge we build for it is louder down there by up to 5.4 dB, because a sealed box rolls off gently into the subsonic region where a vented one falls away steeply once it is under tuning. Above that this alignment is the louder of the two for the same power. The Performance Graphs tab plots this cabinet, 1.88 cubic feet vented at 36.0 Hz, against the 1.20 cu ft sealed wedge we build for this driver (PO 12-S W RSQ3), so you can see exactly where they cross.

It is a vertical slot beside the woofer, the full height of the cavity, 2.75 inches wide and 39.9 square inches. It runs 9.38 inches to the back wall and turns once along it for 18.32 inches; the fold costs about 1.5 Hz and the port is cut for it. The channel runs at 24.6 metres per second at 1800 W, 46 percent of its turbulence limit, and the mouth edges carry a 1/2 inch roundover so the air leaves the face at 16.9 metres per second against the 17 metres per second threshold where a slot starts to chuff.

59 lb, 31.00" W x 16.00" H x 15.88" D external. Every Professional cabinet is priced the same way, by its size: this one is 4.56 cubic feet outside. Delivery to the 48 states is inside the price; it ships as a 59 lb parcel and checkout adds nothing. Do not add polyfill; it ships dry on purpose.

No. This is an enclosure only, cut for the One Audio RSq3 specifically: the 11.125 inch cutout, the 9.000 inch mounting depth allowance and the 1.88 cubic foot alignment all come from One Audio's published parameters. It fits both coil versions; the alignment published here is the D2. Bring your own driver.