Audiobahn ALUM12
12″ subwoofer · 1,000 W RMS
The Audiobahn ALUM12 is a 12″ subwoofer. With Qts 0.37 and EBP 49 it suits a sealed box: tight bass in a small enclosure; a ported box would need a lot of volume.
| Source | web.archive.org · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | not in the spec sheet: Sd — typical value for the size used |
| Mounting dimensions | 3 of 4 — missing: magnet diameter; the designer will use an estimate |
Recommended box
For a sedan, one sub, 1,000 W. It’s the same math as the designer’s step-by-step mode, where you can fit the box to your space, vehicle and amp and get plans, a cut sheet and DXF.
Sealed
smaller, tighter| Bass character (Qtc) | Tight and punchy · 0.80 |
|---|---|
| Fc | 45 Hz |
| F3 (−3 dB, no cabin gain) | 43 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 14 9/16″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 2 3/8 × 14 5/16″, 39 11/16″ long |
| Port velocity at 1,000 W | 63 ft/s |
| F3 (−3 dB, no cabin gain) | 29 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 14 13/16″ |
Deeper: 2.93 ft³ (83 L) tuned to 26 Hz, 31 1/2″ × 15 3/4″ × 18 3/16″ outside — a bigger box with flatter deep bass. Open in the calculator
Projects with this subwoofer
Boxes that users designed and published: plans, cut sheet and response graph.
Thiele/Small parameters
| Size | 12″ |
|---|---|
| Voice coils | — |
| RMS power | 1,000 W |
| Fs | 20.7 Hz |
| Qts | 0.37 |
| Qes | 0.42 |
| Qms | 3.16 |
| Vas | 4.13 ft³ |
|---|---|
| Re | 5.4 Ω |
| Sd | ≈ 76 in² |
| Xmax | 0.63″ |
| EBP | 49 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 85.9 dB calc. |
Mounting dimensions
| Cutout diameter | 11 1/8″ |
|---|---|
| Mounting depth | 5 5/8″ |
| Overall diameter | 12 3/4″ |
Where it fits in a vehicle
Spots from our vehicle guides where the cutout, mounting depth and recommended box fit. The spot sizes are approximate — measure your own vehicle.
- Bronco 4-door — behind the rear seat sealed and ported box
- Wrangler 4-door, hard top — behind the rear seat sealed and ported box
- Wrangler 4-door, soft top — behind the rear seat sealed and ported box
- Silverado / Sierra Crew Cab — under the rear seat sealed box
- FJ Cruiser — behind the rear seat sealed and ported box
- El Camino 1978–87 — behind the seat sealed and ported box
- Cherokee XJ — cargo area, spare moved out sealed and ported box
- Excursion — behind the third row sealed and ported box
- Mustang 2015–2023 coupe — trunk sealed and ported box
- Challenger / Charger — trunk sealed and ported box
- Club Car Precedent — under the rear seat sealed box
“≈” means the value isn’t in the spec sheet and a typical value for the size is used; “calc.” means it’s calculated from the published parameters. Check the manufacturer’s spec sheet before you build.
Data sources
Other Audiobahn 12″ models
- Audiobahn ALUM12N 12″ · dual 6 Ω
- Audiobahn ALUM12Q 12″ · dual 6 Ω
- Audiobahn ALUM12X 12″
- Audiobahn AW120Q 12″
- Audiobahn AW120SVC 12″
- Audiobahn AW120T 12″ · 4 Ω
- Audiobahn AW120XS 12″
- Audiobahn AW121T 12″ · 4 Ω
- Audiobahn AW122N 12″ · 4 Ω
- Audiobahn AW122T 12″
- Audiobahn AW1200 12″
- Audiobahn AW1200N 12″
Similar 12″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Ground Zero GZHW 12SPL-D2 FLAT (2x2 Ohm) 0.78 ft³ sealed · 2.51 ft³ ported
- Helix W12 Competition (1x4 Ohm) 0.74 ft³ sealed · 2.37 ft³ ported
- Kenwood KFC-XW1241HP 0.71 ft³ sealed · 1.34 ft³ ported
- ARC Audio Black 12D2 V2 0.92 ft³ sealed · 2.26 ft³ ported
- Orion 2NT 12 SVC 0.71 ft³ sealed · 2.30 ft³ ported
- Orion 2NT 12 DVC 1.77 ft³ sealed · 2.30 ft³ ported
FAQ
What box does the Audiobahn ALUM12 need?
Recommended net volume: 1.13 ft³ sealed, 2.26 ft³ ported tuned to 30 Hz — for one sub in a sedan at 1,000 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Audiobahn ALUM12 Thiele/Small specs?
Fs 20.7 Hz, Qts 0.37, Vas 4.13 ft³, Xmax 0.63″.
What is the Audiobahn ALUM12 mounting depth?
Mounting depth is 5 5/8″, cutout diameter 11 1/8″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Audiobahn ALUM12 handle and how do I wire it?
RMS power rating: 1,000 W. Wiring for several subs and amp power — in the wiring calculator.
Is the Audiobahn ALUM12 better sealed or ported?
EBP 49: a sealed box (1.13 ft³) suits it best — tight bass in a compact enclosure. Ported is possible (2.26 ft³, tuned to 30 Hz) but larger.
What port does the Audiobahn ALUM12 need?
For the 2.26 ft³ ported box tuned to 30 Hz: slot 2 3/8 × 14 5/16″, 39 11/16″ long, area 33.9 in²; or a round port Ø6 9/16″, ≈ 39 11/16″ long. Port air speed at 1,000 W: 63 ft/s.
What box do two Audiobahn ALUM12 subs need?
Two subs need twice the volume: 2.26 ft³ sealed, or 4.52 ft³ ported at the same 30 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.