DC Audio M4 8 D4
8″ subwoofer · dual 4 Ω · 800 W RMS
Fs 47.4 HzQts 0.61Vas 0.06 ft³Xmax 0.75″
The published specs don’t add up:
- Fs, Vas and Sd don't match the moving mass of 202.53 g (they give 318 g) — one of the spec sheet values is probably wrong.
Recommended box
For a sedan, one sub, 800 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
| Net volume | 0.37 ft³ (10.5 L) |
|---|---|
| Qtc | 0.66 |
| Fc | 51 Hz |
| F3 (−3 dB, no cabin gain) | 56 Hz |
| Example box (outside) | 10 5/8″ × 10 5/8″ × 9 11/16″ |
Ported
| Net volume | 0.57 ft³ (16 L) |
|---|---|
| Tuning (Fb) | 25 Hz |
| Port | slot 1 15/16 × 14 5/16″, 209 1/8″ long |
| Port velocity at 800 W | 37 ft/s |
| F3 (−3 dB, no cabin gain) | 23 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 18 3/4″ |
The volume and tuning are the recommendation, but the port doesn’t fit this example box. Size the box and port in the designer.
Open ported box in designerThiele/Small parameters
| Fs | 47.4 Hz |
|---|---|
| Qts | 0.61 |
| Qes | 0.7 |
| Qms | 4.81 |
| Vas | 0.06 ft³ |
| Re (one coil) | 4 Ω |
| Sd | 29.2 in² |
| Xmax | 0.75″ |
| Vd | 21.9 in³ calc. |
| Mms | 318 g calc. |
| BL | 23.3 T·m calc. |
| EBP | 68 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 76.4 dB calc. |
General
| Size | 8″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 800 W |
Mounting dimensions
| Cutout diameter | 7 1/2″ |
|---|---|
| Mounting depth | 7″ |
| Overall diameter | 8 3/4″ |
“≈” 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 DC Audio 8″ models
- DC Audio M3 8 D4 8″ · dual 4 Ω
- DC Audio M4 8 D2 8″ · dual 2 Ω