Machete MF-08S D4
8″ subwoofer · dual 4 Ω · 600 W RMS
Fs 48.2 HzQts 0.42Vas 0.28 ft³Xmax 0.47″
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
| Net volume | 0.32 ft³ (9 L) |
|---|---|
| Qtc | 0.58 |
| Fc | 66 Hz |
| F3 (−3 dB, no cabin gain) | 87 Hz |
| Example box (outside) | 10 1/4″ × 10 1/4″ × 9 1/4″ |
Ported
| Net volume | 0.64 ft³ (18 L) |
|---|---|
| Tuning (Fb) | 38 Hz |
| Port | round port Ø2 1/2″, 12 11/16″ long |
| Port velocity at 600 W | 244 ft/s |
| F3 (−3 dB, no cabin gain) | 35 Hz |
| Example box (outside) | 17 1/8″ × 15 3/4″ × 7 1/16″ |
Thiele/Small parameters
| Fs | 48.2 Hz |
|---|---|
| Qts | 0.42 |
| Qes | 0.452 |
| Qms | 6 |
| Vas | 0.28 ft³ |
| Re (one coil) | ≈ 3.4 Ω |
| Sd | ≈ 33.3 in² |
| Xmax | 0.47″ |
| EBP | 107 — suits ported calc. |
| Sensitivity, 1 W / 1 m | 84.9 dB calc. |
General
| Size | 8″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 600 W |
Mounting dimensions
| Cutout diameter | 7 3/16″ |
|---|---|
| Mounting depth | 4 9/16″ |
Only Qts is published — Qms assumed to be 6 and Qes calculated (barely affects box design).
“≈” 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 Machete 8″ models
- Machete MF-08S D2 8″ · dual 2 Ω