Sundown Audio Ev6-8 D4

8″ subwoofer · dual 4 Ω · 400 W RMS

Fs 45.6 HzQts 0.55Vas 0.23 ft³Xmax 0.55″

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 volume0.28 ft³ (8 L)
Qtc0.74
Fc61 Hz
F3 (−3 dB, no cabin gain)61 Hz
Example box (outside)10 1/4″ × 10 1/4″ × 8 1/2″
Open sealed box in designer

Ported

Net volume0.60 ft³ (17 L)
Tuning (Fb)40 Hz
Portround port Ø2 1/2″, 12 1/16″ long
Port velocity at 400 W192 ft/s
F3 (−3 dB, no cabin gain)35 Hz
Example box (outside)14 13/16″ × 15 3/4″ × 7 1/2″
Open ported box in designer
2030405060801001502006066727884HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Fs45.6 Hz
Qts0.55
Qes0.617
Qms5.22
Vas0.23 ft³
Re (one coil)2.97 Ω
Sd30.7 in²
Xmax0.55″
Vd16.9 in³ calc.
Mms106 g calc.
BL12.1 T·m calc.
EBP74 — sealed or ported calc.
Sensitivity, 1 W / 1 m81.9 dB calc.

General

Size8″
Voice coilsdual 4 Ω
RMS power400 W

Mounting dimensions

Ø8 1/2″cutout Ø7 1/4″mounting depth 4 15/16″magnet Ø6 3/8″
Cutout diameter7 1/4″
Mounting depth4 15/16″
Overall diameter8 1/2″
Magnet diameter6 3/8″

The spec sheet's Sd of 53.4 in² is the area of a 8″ circle, not the cone's radiating area — not used.

Cone area (Sd) calculated from Fs, Vas and Mms: 30.7 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

Other Sundown Audio 8″ models