Performance Optimized Wedge Ported 12" Enclosure | PowerBass M-1204 Single 12" Ported enclosure

PowerBass's sealed box for the M-1204 is 1.25 cubic feet gross for a 46 Hz F3. Vented in the same volume at 32.5 Hz the wedge reads 38.4 Hz anechoic on 0.34 dB of ripple and 1.46 dB of in-car spread across 25 to 60 Hz; a 68 litre Vas in 1.25 cubic feet is a tight alignment that trades a little reach for a flat passband. The port takes 24.88 of the 25.66 inches available and runs at 17.6 metres per second in the channel against an 18.6 limit, 10.6 at the rounded mouth. Tuning is chosen for in-car response rather than an anechoic curve: a vehicle adds roughly 12 dB per octave below about 45 Hz. In this cabinet that lands at 1.4 dB of in-car spread across 25 to 60 Hz.

The raked face is the seat side. A factory rear seat back leans about 20 degrees off vertical, so the cabinet sits flat against it and uses floor a square box wastes. The baffle stays vertical and fires rearward into the trunk, which acts as the acoustic extension into the cabin. This one is 13.39 inches deep at the base and 7.75 at the top, 30.00 wide and 16 tall.

Yes, at 26 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 PowerBass M-1204 at 65 percent of its usable travel at full rated power; without it there is no meaningful number to quote.

PowerBass rate the M-1204 at 375 W RMS and that is the thermal ceiling. The Performance Graphs tab shows the mechanical limit, the power at which the cone reaches the end of its travel in this cabinet: here the cone sits at 65 percent of usable travel at the rating, so heat is what stops you, not travel. A D2 coil is 4 ohms in series or 1 ohm in parallel; run series unless the amplifier is rated for 1 ohm. A D4 is 8 series or 2 parallel.

Below about 21 Hz, yes. The maker's recommended sealed box is louder down there by up to 0.9 dB, because a sealed box rolls off gently where a vented one falls away steeply under tuning. Above that this alignment is the louder of the two for the same power. The Performance Graphs tab plots this cabinet against PowerBass's recommended sealed box, 1.25 cu ft (1.25 gross, 1.12 net after the driver).

It is a triangular slot in the bottom-rear corner: the floor and the raked back wall are two sides, one bevelled panel is the third. It runs across the cabinet, opens into the box through a 3.37 inch gap at the far end and exits through the side panel as the same triangle. Straight, no bend: 24.88 inches of path and 15.5 square inches of channel running at 17.6 metres per second, 52 percent of its turbulence limit. The three mouth edges are rounded over at 1/2 inch, so the opening at the face is 25.9 square inches and the air leaves it at 10.6 metres per second against the 17.0 threshold where a slot port starts to chuff; the panel's throat end is rounded at 3/8 inch for the same reason. The terminal cup is on the other side.

No, and do not add any. Every sealed Proline X enclosure ships with polyfill; a ported one must not, because damping changes the effective volume the port is tuned against. The port here is cut to 24.88 inches for 32.5 Hz. Stuff it and you move the tuning without shortening the port.

No. This is an enclosure only, cut for the PowerBass M-1204 specifically: the 11.000 inch cutout, the 5.500 inch mounting depth allowance and the 1.25 cubic foot alignment all come from PowerBass's published parameters. It fits both coil versions; the alignment published here is the . Bring your own driver.