Performance Optimized Down Fire Sealed 15" Enclosure Ampere Audio AA-3.0 15 · Single 15" Sealed enclosure

The AA-3.0 15, yes, in the dual 2 ohm version. The baffle is cut to 14.12 in, Ampere's published cutout, under the 15.50 in frame. The 11.50 inch motor clears the cabinet with 0.75 inch to spare. This cabinet is listed for the AA-3.0 15 dual 2 ohm only. Ampere's dual 1 ohm version reads Qtc 0.48 in the same airspace, too damped to sound right sealed, so it is not offered in this enclosure.

Any other 15, no. The airspace is engineered around the AA-3.0 15's own Qts and Vas, and a different woofer that happened to drop into the hole would not see the alignment printed on this page.

2.04 cubic feet net on Ampere's published figures: the dual 2 ohm reads Qtc 0.609 with resonance at 38.5 Hz and half power at 45.7 Hz. That is a slightly over-damped alignment: a gentle, early rolloff and tight transients rather than a flat top.

The 11.50 inch mounting depth sets the minimum cabinet height here, so the airspace is what the motor allows rather than a free choice.

Ampere rates the AA-3.0 15 at 2000 watts RMS, so target 1400 to 2000 watts RMS at the final load.

This cabinet is for the AA-3.0 15 dual 2 ohm: the dual 2 ohm is two 2 ohm coils, 4 ohms in series or 1 ohm in parallel. A parallel load at or under 1 ohm needs an amplifier rated for it. Confirm your amplifier's minimum stable impedance first.

The cabinet is 13.00 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 roughly 14.75 inches.

The footprint is the standard Performance Optimized down fire platform, 30.00 inches wide by 15.00 deep. Height is the only dimension solved to the driver, and here it is the AA-3.0 15's 11.50 inch motor that sets it.

The baffle is two bonded 3/4 inch sheets, 1.5 inches through. A single 3/4 inch panel flexes under the pressure a 15 inch woofer puts on it at 2000 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 Ampere's 15.50 inch frame, so the driver bolts to the inner layer.

Anechoic F3 is 45.7 Hz. Below Qtc 0.707 the rolloff is gentle and F3 sits above fc, which is what an over-damped sealed box does.

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 2.04 cubic feet 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: Ampere prints no bolt circle for the AA-3.0 15, so you set the driver in the recess, mark its holes, drill and press the inserts. The Ampere Audio AA-3.0 15 is purchased separately, and the cabinet is cut direct fit to it, not a general purpose 15 inch box.