Ascendant Audio TEAM 18 D1
18″ subwoofer · dual 1 Ω · 4,000 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, 4,000 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) | Dry and tight · 0.58 |
|---|---|
| Fc | 49 Hz |
| F3 (−3 dB, no cabin gain) | 64 Hz |
| Example box (outside) | 20 1/16″ × 20 1/16″ × 14 3/16″ |
Ported
deeper, louder| Tuning (Fb) | 34 Hz |
|---|---|
| Port | slot 5 7/8 × 19 7/16″, 39 1/16″ long |
| Port velocity at 4,000 W | 78 ft/s |
| F3 (−3 dB, no cabin gain) | 30 Hz |
| Example box (outside) | 31 1/2″ × 20 7/8″ × 26 7/8″ |
Deeper: 3.60 ft³ (102 L) tuned to 32 Hz, 31 1/2″ × 20 7/8″ × 23 1/8″ 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 1 Ω |
| RMS power | 4,000 W |
| Fs | 31.6 Hz |
| Qts | 0.38 |
| Qes | 0.39 |
| Qms | 9.99 |
| Vas | 3.17 ft³ |
| Re (one coil) | 0.65 Ω |
|---|---|
| Sd | 187.6 in² |
| Xmax | 1.30″ |
| Vd | 243.7 in³ calc. |
| Mms | 585 g calc. |
| BL | 13.9 T·m calc. |
| EBP | 81 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 90.6 dB calc. |
Mounting dimensions
| Cutout diameter | 16 3/4″ |
|---|---|
| Mounting depth | 11 3/4″ |
| Overall diameter | 18 1/2″ |
“≈” 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/20150303063436/http://ascendantaudio.com:80/products/team/
- web.archive.org/web/20170101010553/http://ascendantaudio.com/products/team/
Other Ascendant Audio 18″ models
- Ascendant Audio Havoc 18 D1 18″ · dual 1 Ω
- Ascendant Audio Havoc 18 D2 18″ · dual 2 Ω
- Ascendant Audio Mayhem 18 D1 18″ · dual 1 Ω
- Ascendant Audio Mayhem 18 D2 18″ · dual 2 Ω
- Ascendant Audio SMD Signature 18 D1 18″ · dual 1 Ω
- Ascendant Audio SMD Signature 18 D2 18″ · dual 2 Ω
- Ascendant Audio SMD V2 18 D1 18″ · dual 1 Ω
- Ascendant Audio SMD V2 18 D2 18″ · dual 2 Ω
- Ascendant Audio TEAM 18 D2 18″ · dual 2 Ω
Similar 18″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Sundown Audio NSv4-18 D1 2.86 ft³ sealed · 5.23 ft³ ported
- Fi Audio MT 18 D1 2.38 ft³ sealed · 3.00 ft³ ported
- Fi Audio TEAM 18 D1 2.30 ft³ sealed · 3.00 ft³ ported
- Fi Audio TEAM v2 18 D1 2.38 ft³ sealed · 3.00 ft³ ported
- Sundown Audio SAv2-18 D4 1.87 ft³ sealed · 4.52 ft³ ported
- Fi Audio NEO 4.11 18 D1 2.38 ft³ sealed · 5.54 ft³ ported
FAQ
What box does the Ascendant Audio TEAM 18 D1 need?
Recommended net volume: 2.30 ft³ sealed, 5.54 ft³ ported tuned to 34 Hz — for one sub in a sedan at 4,000 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Ascendant Audio TEAM 18 D1 Thiele/Small specs?
Fs 31.6 Hz, Qts 0.38, Vas 3.17 ft³, Xmax 1.30″, Sd 187.6 in².
What is the Ascendant Audio TEAM 18 D1 mounting depth?
Mounting depth is 11 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 Ascendant Audio TEAM 18 D1 handle and how do I wire it?
RMS power rating: 4,000 W. Dual 1 Ω voice coils: series gives 2 Ω, parallel gives 0.5 Ω at the amp. Wiring for several subs and amp power — in the wiring calculator.