Elemental Designs e3.6

6.5″ subwoofer · DVC · 250 W RMS

28 HzFs, resonance

0.29Qts

0.78 ft³Vas

0.51″Xmax

250 WRMS

Source	web.archive.org · manufacturer data
Checked against source	October 2026
Thiele/Small parameters	complete
Mounting dimensions	3 of 4 — missing: magnet diameter; the designer will use an estimate

The published specs don’t add up:

Fs, Vas and Sd don't match the moving mass of 50 g (they give 27 g) — one of the spec sheet values is probably wrong.

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

0.18 ft³ (5 L)

Net volume

Bass character (Qtc)	Flat and accurate · 0.68
Fc	65 Hz
F3 (−3 dB, no cabin gain)	72 Hz
Example box (outside)	9 1/16″ × 9 1/16″ × 7 3/16″

Open sealed box in designer

Ported

deeper, louder

0.53 ft³ (15 L)

Net volume

Tuning (Fb)	31 Hz
Port	slot 1 15/16 × 14 5/16″, 143 3/4″ long
Port velocity at 250 W	20 ft/s
F3 (−3 dB, no cabin gain)	34 Hz
Example box (outside)	31 1/2″ × 15 3/4″ × 14 1/16″

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 designer

Deeper: 0.35 ft³ (10 L) tuned to 39 Hz, 31 1/2″ × 15 3/4″ × 12 13/16″ outside — a bigger box with flatter deep bass. Open in the calculator

Where to buy Amazon

Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Size	6.5″
Voice coils	DVC
RMS power	250 W
Fs	28 Hz
Qts	0.29
Qes	0.3
Qms	10.5
Vas	0.78 ft³

Re (one coil)	3.2 Ω
Sd	17.7 in²
Xmax	0.51″
Vd	9 in³ calc.
Mms	27 g calc.
BL	7.1 T·m calc.
EBP	93 — sealed or ported calc.
Sensitivity, 1 W / 1 m	84.1 dB calc.

Mounting dimensions

Cutout diameter	5 11/16″
Mounting depth	3 1/2″
Overall diameter	6 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

web.archive.org/web/20101231075747/http://www.edesignaudio.com/product_info.php?

Similar 6.5″ subwoofers from other brands

Close in Fs, Qts and Vas — a box of similar volume will suit them.

Helix IK W6-SVC2 (1x2 Ohm) 0.18 ft³ sealed · 0.57 ft³ ported
Ground Zero GZIW 165X (4 Ohm) 0.18 ft³ sealed · 0.60 ft³ ported
Ground Zero GZIW 165 (4 Ohm) 0.18 ft³ sealed · 0.35 ft³ ported
Ground Zero GZIW 165X-II (4 Ohm) 0.18 ft³ sealed · 0.35 ft³ ported
Match PP 72W-D 0.18 ft³ sealed · 0.57 ft³ ported
Helix IK W6-DVC2 (2x2 Ohm) 0.18 ft³ sealed · 0.57 ft³ ported

FAQ

What box does the Elemental Designs e3.6 need?

Recommended net volume: 0.18 ft³ sealed, 0.53 ft³ ported tuned to 31 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 Elemental Designs e3.6 Thiele/Small specs?

Fs 28 Hz, Qts 0.29, Vas 0.78 ft³, Xmax 0.51″, Sd 17.7 in².

What is the Elemental Designs e3.6 mounting depth?

Mounting depth is 3 1/2″, cutout diameter 5 11/16″. The inside depth of the box must exceed the mounting depth by at least 1″.

How much power does the Elemental Designs e3.6 handle and how do I wire it?

RMS power rating: 250 W. Wiring for several subs and amp power — in the wiring calculator.