Audiobahn AW831SE
8″ subwoofer · 200 W RMS
The Audiobahn AW831SE is a 8″ subwoofer. With Qts 0.36 and EBP 97 it works both sealed and ported: sealed is tighter and smaller, ported is deeper and louder. Modest excursion (Xmax 0.28″) — for clean sound at moderate levels, not for SPL competitions.
| 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, 200 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) | Dry and tight · 0.58 |
|---|---|
| Fc | 62 Hz |
| F3 (−3 dB, no cabin gain) | 82 Hz |
| Example box (outside) | 10 1/4″ × 10 1/4″ × 8 1/2″ |
Ported
deeper, louder| Tuning (Fb) | 41 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 35 3/16″ long |
| Port velocity at 200 W | 39 ft/s |
| F3 (−3 dB, no cabin gain) | 37 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 7 3/4″ |
Deeper: 0.60 ft³ (17 L) tuned to 36 Hz, 31 1/2″ × 15 3/4″ × 10 15/16″ 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 | 8″ |
|---|---|
| Voice coils | — |
| RMS power | 200 W |
| Fs | 38.6 Hz |
| Qts | 0.36 |
| Qes | 0.4 |
| Qms | 3.72 |
| Vas | 0.44 ft³ |
| Re | 3.3 Ω |
|---|---|
| Sd | 31 in² |
| Xmax | 0.28″ |
| Vd | 8.5 in³ calc. |
| Mms | 77 g calc. |
| BL | 12.4 T·m calc. |
| EBP | 97 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 84.6 dB calc. |
Mounting dimensions
| Cutout diameter | 7″ |
|---|---|
| Mounting depth | 3 7/16″ |
| Overall diameter | 8 3/8″ |
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.
- F-150 SuperCrew — under the rear seat sealed and ported box
- F-150 regular cab — behind the seat sealed and ported box
- Ram Crew Cab — under the rear seat sealed and ported box
- Ram regular cab — behind the seat sealed and ported box
- Tacoma Double Cab — under the rear seat sealed and ported box
- Tacoma Access Cab — behind the front seats sealed and ported box
- 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
- Silverado / Sierra regular cab — behind the seat sealed and ported box
- Spare tire well sealed box
- Polaris RZR / Ranger — under the seat sealed box
- Can-Am — under the seat sealed box
- Avalanche — 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
- C10 1973–87 regular cab — 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
- Tesla Model 3 — well under the trunk floor sealed and ported box
- Club Car Precedent — under the rear seat sealed and ported 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 8″ models
- Audiobahn ALUM8P 8″
- Audiobahn AW800Q 8″
- Audiobahn AW800X 8″
- Audiobahn AW831Q 8″
- Audiobahn AW831T 8″ · dual 4 Ω
- Audiobahn AW831X 8″
Similar 8″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Focal Slatefiber SUB 20 SF (SVC 4 ohm) 0.28 ft³ sealed · 0.92 ft³ ported
- Audio System X08 EVO 0.28 ft³ sealed · 0.95 ft³ ported
- Rockford Fosgate Punch HE2 RFP2208 (2000) 0.32 ft³ sealed · 0.99 ft³ ported
- Rockford Fosgate Punch HE2 RFP4208 0.28 ft³ sealed · 0.92 ft³ ported
- Rockford Fosgate Punch HE2 RFP4108 0.28 ft³ sealed · 0.92 ft³ ported
- Zetta Audio L-8 300 0.28 ft³ sealed · 0.49 ft³ ported
FAQ
What box does the Audiobahn AW831SE need?
Recommended net volume: 0.28 ft³ sealed, 0.92 ft³ ported tuned to 41 Hz — for one sub in a sedan at 200 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Audiobahn AW831SE Thiele/Small specs?
Fs 38.6 Hz, Qts 0.36, Vas 0.44 ft³, Xmax 0.28″, Sd 31 in².
What is the Audiobahn AW831SE mounting depth?
Mounting depth is 3 7/16″, cutout diameter 7″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Audiobahn AW831SE handle and how do I wire it?
RMS power rating: 200 W. Wiring for several subs and amp power — in the wiring calculator.
Is the Audiobahn AW831SE better sealed or ported?
EBP 97: both work — sealed 0.28 ft³ is tighter and smaller, ported 0.92 ft³ tuned to 41 Hz is deeper and louder.
What port does the Audiobahn AW831SE need?
For the 0.92 ft³ ported box tuned to 41 Hz: slot 1 9/16 × 14 5/16″, 35 3/16″ long, area 22.6 in²; or a round port Ø5 3/8″, ≈ 35 3/16″ long. Port air speed at 200 W: 39 ft/s.
What box do two Audiobahn AW831SE subs need?
Two subs need twice the volume: 0.57 ft³ sealed, or 1.84 ft³ ported at the same 41 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.