DD Audio 506d D4
6.5″ subwoofer · dual 4 Ω · 400 W RMS
Fs 43.7 HzQts 0.50Vas 0.16 ft³Xmax 0.35″
Recommended box
For a sedan, one sub, 400 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 | 0.18 ft³ (5 L) |
|---|---|
| Qtc | 0.69 |
| Fc | 60 Hz |
| F3 (−3 dB, no cabin gain) | 64 Hz |
| Example box (outside) | 9 1/16″ × 9 1/16″ × 7 3/16″ |
Ported
| Net volume | 0.39 ft³ (11 L) |
|---|---|
| Tuning (Fb) | 35 Hz |
| Port | slot 1 15/16 × 14 5/16″, 154 1/16″ long |
| Port velocity at 400 W | 26 ft/s |
| F3 (−3 dB, no cabin gain) | 32 Hz |
| Example box (outside) | 31 1/2″ × 15 3/4″ × 14 3/16″ |
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 | 43.7 Hz |
|---|---|
| Qts | 0.50 |
| Qes | 0.558 |
| Qms | 4.91 |
| Vas | 0.16 ft³ |
| Re (one coil) | ≈ 3.4 Ω |
| Sd | ≈ 20.2 in² |
| Xmax | 0.35″ |
| EBP | 78 — sealed or ported calc. |
| Sensitivity, 1 W / 1 m | 80.2 dB calc. |
General
| Size | 6.5″ |
|---|---|
| Voice coils | dual 4 Ω |
| RMS power | 400 W |
Mounting dimensions
| Cutout diameter | 6″ |
|---|---|
| Mounting depth | 4 1/2″ |
| Overall diameter | 7″ |
“≈” 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 DD Audio 6.5″ models
- DD Audio 506d D2 6.5″ · dual 2 Ω