Helix DB 12 Deep Blue (1x4 Ohm)
12″ subwoofer · 4 Ω · 250 W RMS
| Source | web.archive.org · manufacturer data |
|---|---|
| Checked against source | October 2026 |
| Thiele/Small parameters | complete |
| Mounting dimensions | 1 of 4 — missing: cutout, frame outer diameter, magnet diameter; the designer will use an estimate |
Recommended box
For a sedan, one sub, 250 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 · 0.80 |
|---|---|
| Fc | 65 Hz |
| F3 (−3 dB, no cabin gain) | 62 Hz |
| Example box (outside) | 14 3/16″ × 14 3/16″ × 11 15/16″ |
Ported
deeper, louder| Tuning (Fb) | 30 Hz |
|---|---|
| Port | slot 1 9/16 × 14 5/16″, 24 13/16″ long |
| Port velocity at 250 W | 46 ft/s |
| F3 (−3 dB, no cabin gain) | 35 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 12 15/16″ |
Deeper: 2.75 ft³ (78 L) tuned to 33 Hz, 31 1/2″ × 15 3/4″ × 14″ 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 | 250 W |
| Fs | 27.6 Hz |
| Qts | 0.34 |
| Qes | 0.38 |
| Qms | 3.39 |
| Vas | 4.01 ft³ |
| Re | 3.2 Ω |
|---|---|
| Sd | 79.3 in² |
| Xmax | 0.35″ |
| Vd | 28.1 in³ calc. |
| Mms | 108 g calc. |
| BL | 12.6 T·m calc. |
| EBP | 73 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 90 dB calc. |
Mounting dimensions
| Cutout diameter | ≈ 11 1/8″ |
|---|---|
| Mounting depth | 5 3/8″ |
Cone area (Sd) calculated from Fs, Vas and Mms: 79.3 in².
“≈” 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/20060311214510/http://www.audiotec-fischer.com/pdfs/Woofer_D
- web.archive.org/web/20061016233435/http://www.audiotec-fischer.com/pdfs/Helix%20
- web.archive.org/web/20070710072042/http://www.audiotec-fischer.com:80/pdfs/HELIX
Other Helix 12″ models
- Helix IK S12-DVC2 (2x2 Ohm) 12″ · dual 2 Ω
- Helix IK S12-SVC2 (1x2 Ohm) 12″ · 2 Ω
- Helix IK W12-DVC2 (2x2 Ohm) 12″ · dual 2 Ω
- Helix IK W12-SVC2 (1x2 Ohm) 12″ · 2 Ω
- Helix IQ W12-DVC2 (2x2 Ohm) 12″ · dual 2 Ω
- Helix K 12W-SVC2 (1x2 Ohm) 12″ · 2 Ω
- Helix Q 12W (2x2 Ohm) 12″ · dual 2 Ω
- Helix W12 Competition (1x4 Ohm) 12″ · 4 Ω
Similar 12″ subwoofers from other brands
Close in Fs, Qts and Vas — a box of similar volume will suit them.
- Gladen M 12 (SVC 4 ohm) 1.09 ft³ sealed · 2.26 ft³ ported
- SPL Dynamics V-12S 1.02 ft³ sealed · 2.37 ft³ ported
- Magnat Shockwave 1200 0.71 ft³ sealed · 2.26 ft³ ported
- Diamond M3121 1.27 ft³ sealed · 2.33 ft³ ported
- Rockford Fosgate Punch HX2 RFD1212 (2000) 1.31 ft³ sealed · 2.26 ft³ ported
- Ground Zero GZRW 30C (4 Ohm) 0.74 ft³ sealed · 2.26 ft³ ported
FAQ
What box does the Helix DB 12 Deep Blue (1x4 Ohm) need?
Recommended net volume: 0.88 ft³ sealed, 2.33 ft³ ported tuned to 30 Hz — for one sub in a sedan at 250 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.
What are the Helix DB 12 Deep Blue (1x4 Ohm) Thiele/Small specs?
Fs 27.6 Hz, Qts 0.34, Vas 4.01 ft³, Xmax 0.35″, Sd 79.3 in².
What is the Helix DB 12 Deep Blue (1x4 Ohm) mounting depth?
Mounting depth is 5 3/8″. The inside depth of the box must exceed the mounting depth by at least 1″.
How much power does the Helix DB 12 Deep Blue (1x4 Ohm) handle and how do I wire it?
RMS power rating: 250 W. Wiring for several subs and amp power — in the wiring calculator.