Sony XS-GTX120L
12″ subwoofer · 4 Ω · 300 W RMS
| Source | sony.com · 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 |
Recommended box
For a sedan, one sub, 300 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 · 0.85 |
|---|---|
| Fc | 46 Hz |
| F3 (−3 dB, no cabin gain) | 42 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 8 3/4″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 27 1/2″ long |
| Port velocity at 300 W | 44 ft/s |
| F3 (−3 dB, no cabin gain) | 33 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 10 1/2″ |
Deeper: 2.93 ft³ (83 L) tuned to 32 Hz, 31 1/2″ × 15 3/4″ × 14 11/16″ 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 | 4 Ω |
| RMS power | 300 W |
| Fs | 31.1 Hz |
| Qts | 0.57 |
| Qes | 0.61 |
| Qms | 9.22 |
| Vas | 2.05 ft³ |
| Re | 3.45 Ω |
|---|---|
| Sd | 76.1 in² |
| Xmax | 0.30″ |
| Vd | 23.1 in³ calc. |
| Mms | 154 g calc. |
| BL | 13 T·m calc. |
| EBP | 51 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 86.6 dB calc. |
Mounting dimensions
| Cutout diameter | ≈ 11 1/8″ |
|---|---|
| Mounting depth | ≈ 5 7/8″ |
“≈” 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
- sony.com/electronics/support/res/manuals/4151/41512122M.pdf
- sony.com/electronics/support/car-marine-entertainment-in-car-speakers/xs-gtx120l
Other Sony 12″ models
- Sony XS-GSW121D 12″ · dual 4 Ω
- Sony XS-GTR120L 12″ · 4 Ω
- Sony XS-GTR121L 12″ · 4 Ω
- Sony XS-GTX121L 12″ · 4 Ω
- Sony XS-L12S 12″ · 4 Ω
- Sony XS-W122ES 12″ · 2 Ω
- Sony XS-W124ES 12″ · 4 Ω
Similar 12″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- American Bass XO-1244v2 1.80 ft³ sealed · 1.52 ft³ ported
- Dayton Audio UMII12-22 1.84 ft³ sealed · 1.48 ft³ ported
- JBL Club 1224 (SSI set to 4 ohm) 1.84 ft³ sealed · 1.70 ft³ ported
- Spyder Nitro 12 800W S2 1.73 ft³ sealed · 1.77 ft³ ported
- Spyder Nitro 12 800W S4 1.73 ft³ sealed · 1.77 ft³ ported
- Kicker Solo-Baric L7S 12" 2-Ohm DVC (44L7S122) 2.30 ft³ sealed · 2.51 ft³ ported
FAQ
What box does the Sony XS-GTX120L need?
Recommended net volume: 1.73 ft³ sealed, 1.66 ft³ ported tuned to 34 Hz — for one sub in a sedan at 300 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Sony XS-GTX120L Thiele/Small specs?
Fs 31.1 Hz, Qts 0.57, Vas 2.05 ft³, Xmax 0.30″, Sd 76.1 in².
How much power does the Sony XS-GTX120L handle and how do I wire it?
RMS power rating: 300 W. Wiring for several subs and amp power — in the wiring calculator.