Soundstream SPLX-154 (2006)
15″ subwoofer · 4 Ω · 1,000 W RMS
The Soundstream SPLX-154 (2006) is a 15″ subwoofer. With Qts 0.36 and EBP 89 it works both sealed and ported: sealed is tighter and smaller, ported is deeper and louder. Modest excursion (Xmax 0.57″) — 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 | 0 of 4 — missing: cutout, mounting depth, frame outer diameter, magnet diameter; the designer will use an estimate |
- Re 0.26 Ω doesn't look like a 4 Ω coil — check the spec sheet.
- This sub has 4 voice coils — wiring options are calculated as for a single coil; check the final impedance against the spec sheet.
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) | Flat and accurate · 0.63 |
|---|---|
| Fc | 60 Hz |
| F3 (−3 dB, no cabin gain) | 72 Hz |
| Example box (outside) | 17 5/16″ × 17 5/16″ × 10 5/16″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 3 3/8 × 16 11/16″, 29″ long |
| Port velocity at 1,000 W | 63 ft/s |
| F3 (−3 dB, no cabin gain) | 31 Hz |
| Example box (outside) | 31 1/2″ × 18 1/8″ × 18 3/8″ |
Deeper: 2.37 ft³ (67 L) tuned to 36 Hz, 31 1/2″ × 18 1/8″ × 13 1/2″ 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 | 4 Ω |
| RMS power | 1,000 W |
| Fs | 34.4 Hz |
| Qts | 0.36 |
| Qes | 0.388 |
| Qms | 5.04 |
| Vas | 2.31 ft³ |
| Re | 0.26 Ω |
|---|---|
| Sd | 124 in² |
| Xmax | 0.57″ |
| Vd | 70.3 in³ calc. |
| Mms | 296 g calc. |
| BL | 6.6 T·m calc. |
| EBP | 89 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 90.4 dB calc. |
Mounting dimensions
| Cutout diameter | ≈ 14″ |
|---|---|
| Mounting depth | ≈ 7 1/16″ |
“≈” 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 Soundstream 15″ models
- Soundstream PCW-15 15″ · dual 4 Ω
- Soundstream PWS-15 15″ · dual 4 Ω
- Soundstream PXW-15 15″ · dual 4 Ω
- Soundstream PXW-15/2 15″ · dual 2 Ω
- Soundstream R1-15 15″ · dual 4 Ω
- Soundstream R1-15L 15″ · dual 4 Ω
- Soundstream R3.15 15″ · dual 2 Ω
- Soundstream RBW-15 15″ · dual 4 Ω
- Soundstream SPLX-152 ('07-'08) 15″ · dual 2 Ω
- Soundstream SPLX-152 (2006) 15″ · dual 2 Ω
- Soundstream SPLX-152HX 15″ · dual 2 Ω
- Soundstream SPLX-154 ('07-'08) 15″ · 4 Ω
Similar 15″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Sundown Audio Uv1-15 D4 1.31 ft³ sealed · 3.00 ft³ ported
- Fi Audio NEO 3.7 15 D1 1.59 ft³ sealed · 3.71 ft³ ported
- Fi Audio BL-NEO 15 D1 1.18 ft³ sealed · 3.71 ft³ ported
- Fi Audio BL15v3 D1 1.18 ft³ sealed · 3.71 ft³ ported
- Fi Audio BL15v3 D2 1.18 ft³ sealed · 3.71 ft³ ported
- Fi Audio BL15v3.1 D1 1.18 ft³ sealed · 3.71 ft³ ported
FAQ
What box does the Soundstream SPLX-154 (2006) need?
Recommended net volume: 1.13 ft³ sealed, 3.67 ft³ ported tuned to 34 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 Soundstream SPLX-154 (2006) Thiele/Small specs?
Fs 34.4 Hz, Qts 0.36, Vas 2.31 ft³, Xmax 0.57″, Sd 124 in².
How much power does the Soundstream SPLX-154 (2006) 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 Soundstream SPLX-154 (2006) better sealed or ported?
EBP 89: both work — sealed 1.13 ft³ is tighter and smaller, ported 3.67 ft³ tuned to 34 Hz is deeper and louder.
What port does the Soundstream SPLX-154 (2006) need?
For the 3.67 ft³ ported box tuned to 34 Hz: slot 3 3/8 × 16 11/16″, 29″ long, area 55.9 in²; or a round port Ø8 7/16″, ≈ 29″ long. Port air speed at 1,000 W: 63 ft/s.
What box do two Soundstream SPLX-154 (2006) subs need?
Two subs need twice the volume: 2.26 ft³ sealed, or 7.35 ft³ ported at the same 34 Hz tuning with twice the port area. One shared chamber or one per sub — whatever fits your vehicle.