Audiobahn ALUM12Q
12″ subwoofer · dual 6 Ω · 1,000 W RMS
The Audiobahn ALUM12Q is a 12″ subwoofer. With Qts 0.47 and EBP 47 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 | complete |
| 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 | 42 Hz |
| F3 (−3 dB, no cabin gain) | 39 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 17 9/16″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 2 3/8 × 14 5/16″, 41 7/8″ long |
| Port velocity at 1,000 W | 62 ft/s |
| F3 (−3 dB, no cabin gain) | 28 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 14 9/16″ |
Deeper: 2.93 ft³ (83 L) tuned to 27 Hz, 31 1/2″ × 15 3/4″ × 18 7/16″ 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 | dual 6 Ω |
| RMS power | 1,000 W |
| Fs | 24.4 Hz |
| Qts | 0.47 |
| Qes | 0.52 |
| Qms | 4.8 |
| Vas | 2.68 ft³ |
| Re (one coil) | 5.4 Ω |
|---|---|
| Sd | 76 in² |
| Xmax | 0.55″ |
| Vd | 41.9 in³ calc. |
| Mms | 190 g calc. |
| BL | 17.4 T·m calc. |
| EBP | 47 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 85.3 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 and ported 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
- web.archive.org/web/20060317162127/http://www.audiobahn.com/Audiobahn06/images/t
- web.archive.org/web/20050307032618/http://audiobahn.com/tech/2002/Sub%20Specs/Au
Other Audiobahn 12″ models
- Audiobahn ALUM12 12″
- Audiobahn ALUM12N 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.
- Infinity Reference 1262W 1.38 ft³ sealed · 2.26 ft³ ported
- JL Audio 12W6v2-D4 1.31 ft³ sealed · 2.26 ft³ ported
- Rockford Fosgate Punch HX2 RFD2212 1.55 ft³ sealed · 2.12 ft³ ported
- Infinity Reference 1240W 1.55 ft³ sealed · 2.40 ft³ ported
- Infinity Reference 1250W 1.55 ft³ sealed · 2.40 ft³ ported
- Magnat XBASS 1200 1.02 ft³ sealed · 2.12 ft³ ported
FAQ
What box does the Audiobahn ALUM12Q need?
Recommended net volume: 1.41 ft³ sealed, 2.15 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 ALUM12Q Thiele/Small specs?
Fs 24.4 Hz, Qts 0.47, Vas 2.68 ft³, Xmax 0.55″, Sd 76 in².
What is the Audiobahn ALUM12Q 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 ALUM12Q handle and how do I wire it?
RMS power rating: 1,000 W. Dual 6 Ω voice coils: series gives 12 Ω, parallel gives 3 Ω at the amp. Wiring for several subs and amp power — in the wiring calculator.
Is the Audiobahn ALUM12Q better sealed or ported?
EBP 47: a sealed box (1.41 ft³) suits it best — tight bass in a compact enclosure. Ported is possible (2.15 ft³, tuned to 30 Hz) but larger.
What port does the Audiobahn ALUM12Q need?
For the 2.15 ft³ ported box tuned to 30 Hz: slot 2 3/8 × 14 5/16″, 41 7/8″ long, area 33.9 in²; or a round port Ø6 9/16″, ≈ 41 7/8″ long. Port air speed at 1,000 W: 62 ft/s.
What box do two Audiobahn ALUM12Q subs need?
Two subs need twice the volume: 2.83 ft³ sealed, or 4.31 ft³ ported at the same 30 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.