Audiopipe TXX-BD4-15
15″ subwoofer · dual 4 Ω · 1,400 W RMS
The Audiopipe TXX-BD4-15 is a 15″ subwoofer. With Qts 0.37 and EBP 68 it works both sealed and ported: sealed is tighter and smaller, ported is deeper and louder. Modest excursion (Xmax 0.33″) — 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, 1,400 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) | Flat and accurate · 0.64 |
|---|---|
| Fc | 52 Hz |
| F3 (−3 dB, no cabin gain) | 61 Hz |
| Example box (outside) | 16 15/16″ × 16 15/16″ × 11 5/16″ |
Ported
deeper, louder| Tuning (Fb) | 33 Hz |
|---|---|
| Port | slot 3 15/16 × 16 5/16″, 33 9/16″ long |
| Port velocity at 1,400 W | 64 ft/s |
| F3 (−3 dB, no cabin gain) | 30 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 20 13/16″ |
Deeper: 2.51 ft³ (71 L) tuned to 32 Hz, 31 1/2″ × 17 11/16″ × 15 3/8″ 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 | 15″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 1,400 W |
| Fs | 30 Hz |
| Qts | 0.37 |
| Qes | 0.44 |
| Qms | 2.3 |
| Vas | 2.44 ft³ |
| Re (one coil) | 3.6 Ω |
|---|---|
| Sd | 131.8 in² |
| Xmax | 0.33″ |
| Vd | 44.1 in³ calc. |
| Mms | 417 g calc. |
| BL | 25.4 T·m calc. |
| EBP | 68 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 88.3 dB calc. |
Mounting dimensions
| Cutout diameter | 13 13/16″ |
|---|---|
| Mounting depth | 8 7/8″ |
| Overall diameter | 15 1/2″ |
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.
- Excursion — behind the third row sealed 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 Audiopipe 15″ models
- Audiopipe TS-AR15 15″ · 4 Ω
- Audiopipe TS-PP3-15-D4 15″ · dual 4 Ω
- Audiopipe TXX-APC-15 15″ · dual 4 Ω
- Audiopipe TXX-BD1-15 15″ · dual 4 Ω
- Audiopipe TXX-BD2-15 15″ · dual 4 Ω
- Audiopipe TXX-BD3-15 15″ · dual 4 Ω
- Audiopipe TXX-BD3-15D2 15″ · dual 2 Ω
Similar 15″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Swat GLK-P15D2 1.13 ft³ sealed · 1.98 ft³ ported
- Kicx ZT15V2 (2+2) 1.09 ft³ sealed · 3.57 ft³ ported
- Deaf Bonce Apocalypse DB-3515R D1 1.59 ft³ sealed · 3.67 ft³ ported
- Machete MFX38 D2 1.13 ft³ sealed · 1.98 ft³ ported
- Deaf Bonce Apocalypse DB-4515R D2 1.73 ft³ sealed · 3.67 ft³ ported
- American Bass GF-1511 1.36 ft³ sealed · 3.25 ft³ ported
FAQ
What box does the Audiopipe TXX-BD4-15 need?
Recommended net volume: 1.20 ft³ sealed, 3.92 ft³ ported tuned to 33 Hz — for one sub in a sedan at 1,400 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Audiopipe TXX-BD4-15 Thiele/Small specs?
Fs 30 Hz, Qts 0.37, Vas 2.44 ft³, Xmax 0.33″, Sd 131.8 in².
What is the Audiopipe TXX-BD4-15 mounting depth?
Mounting depth is 8 7/8″, cutout diameter 13 13/16″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Audiopipe TXX-BD4-15 handle and how do I wire it?
RMS power rating: 1,400 W. Dual 4 Ω voice coils: series gives 8 Ω, parallel gives 2 Ω at the amp. Wiring for several subs and amp power — in the wiring calculator.
Is the Audiopipe TXX-BD4-15 better sealed or ported?
EBP 68: both work — sealed 1.20 ft³ is tighter and smaller, ported 3.92 ft³ tuned to 33 Hz is deeper and louder.
What port does the Audiopipe TXX-BD4-15 need?
For the 3.92 ft³ ported box tuned to 33 Hz: slot 3 15/16 × 16 5/16″, 33 9/16″ long, area 64.2 in²; or a round port Ø9 1/16″, ≈ 33 9/16″ long. Port air speed at 1,400 W: 64 ft/s.
What box do two Audiopipe TXX-BD4-15 subs need?
Two subs need twice the volume: 2.40 ft³ sealed, or 7.84 ft³ ported at the same 33 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.