MTX Audio T815-44
15″ subwoofer · dual 4 Ω · 600 W RMS
| 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, 600 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 · 0.89 |
|---|---|
| Fc | 46 Hz |
| F3 (−3 dB, no cabin gain) | 40 Hz |
| Example box (outside) | 31 1/2″ × 17 11/16″ × 12″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 1 9/16 × 16 5/16″, 24 13/16″ long |
| Port velocity at 600 W | 53 ft/s |
| F3 (−3 dB, no cabin gain) | 35 Hz |
| Example box (outside) | 21 5/8″ × 17 11/16″ × 15 3/4″ |
Deeper: 4.84 ft³ (137 L) tuned to 31 Hz, 31 1/2″ × 17 11/16″ × 20 3/4″ 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 | 600 W |
| Fs | 33 Hz |
| Qts | 0.64 |
| Qes | 0.801 |
| Qms | 3.3 |
| Vas | 2.58 ft³ |
| Re (one coil) | 3.25 Ω |
|---|---|
| Sd | 124.7 in² |
| Xmax | 0.63″ |
| Vd | 78.5 in³ calc. |
| Mms | 292 g calc. |
| BL | 15.7 T·m calc. |
| EBP | 41 — suits sealed calc. |
| Sensitivity, 1 W / 1 m | 87.2 dB calc. |
Mounting dimensions
| Cutout diameter | 13 15/16″ |
|---|---|
| Mounting depth | 8 9/16″ |
| Overall diameter | 15 7/16″ |
“≈” 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 MTX Audio 15″ models
- MTX Audio 5515-22 15″ · dual 2 Ω
- MTX Audio 5515-44 15″ · dual 4 Ω
- MTX Audio 7515-22 15″ · dual 2 Ω
- MTX Audio 7515-44 15″ · dual 4 Ω
- MTX Audio RT15-04 15″ · 4 Ω
- MTX Audio RTS15-04 15″ · 4 Ω
- MTX Audio T5515-04 15″ · 4 Ω
- MTX Audio T8154 15″ · 4 Ω
- MTX Audio T9515-04 15″ · 4 Ω
- MTX Audio TX615 15″ · 2 Ω
Similar 15″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Machete M15 D2 2.83 ft³ sealed · 2.12 ft³ ported
- Ground Zero GZRW 38XSPL-D2 (2x2 Ohm) 2.83 ft³ sealed · 1.98 ft³ ported
- Machete M15 D2 Sport 2.83 ft³ sealed · 1.98 ft³ ported
- Memphis Car Audio MJP1544 (MOJO Pro 15" DVC 4ohm) 2.93 ft³ sealed · 2.33 ft³ ported
- DC Audio Level 3 M3 15 D1 2.90 ft³ sealed · 2.40 ft³ ported
- DC Audio Level 3 M3 15 D2 2.90 ft³ sealed · 2.40 ft³ ported
FAQ
What box does the MTX Audio T815-44 need?
Recommended net volume: 2.83 ft³ sealed, 2.05 ft³ ported tuned to 34 Hz — for one sub in a sedan at 600 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the MTX Audio T815-44 Thiele/Small specs?
Fs 33 Hz, Qts 0.64, Vas 2.58 ft³, Xmax 0.63″, Sd 124.7 in².
What is the MTX Audio T815-44 mounting depth?
Mounting depth is 8 9/16″, cutout diameter 13 15/16″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the MTX Audio T815-44 handle and how do I wire it?
RMS power rating: 600 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.