Audiobahn AW1805Q
18″ subwoofer · dual 2 Ω · 1,200 W RMS
The Audiobahn AW1805Q is a 18″ subwoofer. With Qts 0.41 and EBP 53 it works both sealed and ported: sealed is tighter and smaller, ported is deeper and louder.
| 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, 1,200 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) | Tight and punchy · 0.80 |
|---|---|
| Fc | 46 Hz |
| F3 (−3 dB, no cabin gain) | 44 Hz |
| Example box (outside) | 20 1/16″ × 20 1/16″ × 10 7/8″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 2 9/16 × 19 7/16″, 33 11/16″ long |
| Port velocity at 1,200 W | 65 ft/s |
| F3 (−3 dB, no cabin gain) | 28 Hz |
| Example box (outside) | 31 1/2″ × 20 7/8″ × 16 13/16″ |
Deeper: 5.30 ft³ (150 L) tuned to 25 Hz, 31 1/2″ × 20 7/8″ × 22 5/8″ 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 | 18″ |
|---|---|
| Voice coils | dual 2 Ω |
| RMS power | 1,200 W |
| Fs | 23.2 Hz |
| Qts | 0.41 |
| Qes | 0.44 |
| Qms | 5.27 |
| Vas | 4.70 ft³ |
| Re (one coil) | 1.65 Ω |
|---|---|
| Sd | 170.5 in² |
| Xmax | 1.02″ |
| Vd | 174.5 in³ calc. |
| Mms | 606 g calc. |
| BL | 18.2 T·m calc. |
| EBP | 53 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 87.8 dB calc. |
Mounting dimensions
| Cutout diameter | 16 3/4″ |
|---|---|
| Mounting depth | 7 3/4″ |
| Overall diameter | 18 1/2″ |
Judging by its value, the published Re is for both coils in series — converted to per coil.
“≈” 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/20060317155845/http://www.audiobahn.com/Audiobahn06/images/t
- web.archive.org/web/20060317160216/http://www.audiobahn.com/Audiobahn06/images/t
- web.archive.org/web/20060317162112/http://www.audiobahn.com/Audiobahn06/images/t
- web.archive.org/web/20050307032618/http://audiobahn.com/tech/2002/Sub%20Specs/Au
Other Audiobahn 18″ models
Similar 18″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Sundown Audio Zv6-18 D2 2.79 ft³ sealed · 6.99 ft³ ported
- Fi Audio SP4 18v2+ D1 2.38 ft³ sealed · 5.54 ft³ ported
- Kicker SoloX 18" 4-Ohm DVC (S18X D4) 2.12 ft³ sealed · 4.48 ft³ ported
- SoundQubed HDX418 D1 2.47 ft³ sealed · 4.63 ft³ ported
- Fi Audio SP4 18v2+ D2 2.38 ft³ sealed · 5.54 ft³ ported
- Sundown Audio Xv3-18 D1 2.01 ft³ sealed · 6.99 ft³ ported
- Sundown Audio Zv7-18 D1 2.93 ft³ sealed · 2.83 ft³ ported
FAQ
What box does the Audiobahn AW1805Q need?
Recommended net volume: 1.62 ft³ sealed, 3.74 ft³ ported tuned to 30 Hz — for one sub in a sedan at 1,200 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Audiobahn AW1805Q Thiele/Small specs?
Fs 23.2 Hz, Qts 0.41, Vas 4.70 ft³, Xmax 1.02″, Sd 170.5 in².
What is the Audiobahn AW1805Q mounting depth?
Mounting depth is 7 3/4″, cutout diameter 16 3/4″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Audiobahn AW1805Q handle and how do I wire it?
RMS power rating: 1,200 W. Dual 2 Ω voice coils: series gives 4 Ω, parallel gives 1 Ω at the amp. Wiring for several subs and amp power — in the wiring calculator.
Is the Audiobahn AW1805Q better sealed or ported?
EBP 53: both work — sealed 1.62 ft³ is tighter and smaller, ported 3.74 ft³ tuned to 30 Hz is deeper and louder.
What port does the Audiobahn AW1805Q need?
For the 3.74 ft³ ported box tuned to 30 Hz: slot 2 9/16 × 19 7/16″, 33 11/16″ long, area 49.8 in²; or a round port Ø7 15/16″, ≈ 33 11/16″ long. Port air speed at 1,200 W: 65 ft/s.
What box do two Audiobahn AW1805Q subs need?
Two subs need twice the volume: 3.25 ft³ sealed, or 7.49 ft³ ported at the same 30 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.