Diamond M6mkII 10D4

10″ subwoofer · dual 4 Ω

40 HzFs, resonance

0.49Qts

0.43 ft³Vas

0.72″Xmax

Source	web.archive.org · manufacturer data
Checked against source	October 2026
Thiele/Small parameters	complete
Mounting dimensions	0 of 4 — missing: cutout, mounting depth, frame outer diameter, magnet diameter; the designer will use an estimate

Recommended box

For a sedan, one sub, 300 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

0.46 ft³ (13 L)

Net volume

Bass character (Qtc)	Flat and accurate · 0.68
Fc	56 Hz
F3 (−3 dB, no cabin gain)	60 Hz
Example box (outside)	12 3/16″ × 12 3/16″ × 9 3/16″

Open sealed box in designer

Ported

deeper, louder

0.78 ft³ (22 L)

Net volume

Tuning (Fb)	38 Hz
Port	slot 1 × 14 5/16″, 30 1/2″ long
Port velocity at 300 W	62 ft/s
F3 (−3 dB, no cabin gain)	34 Hz
Example box (outside)	15″ × 15 3/4″ × 12 3/8″

Open ported box in designer

Deeper: 0.95 ft³ (27 L) tuned to 42 Hz, 25″ × 15 3/4″ × 7 11/16″ 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	10″
Voice coils	dual 4 Ω
RMS power	—
Fs	40 Hz
Qts	0.49
Qes	0.56
Qms	3.92
Vas	0.43 ft³

Re (one coil)	3 Ω
Sd	49 in²
Xmax	0.72″
Vd	35.3 in³ calc.
Mms	182 g calc.
BL	15.7 T·m calc.
EBP	71 — sealed or ported calc.
Sensitivity, 1 W / 1 m	83.5 dB calc.

Mounting dimensions

Cutout diameter	≈ 9 1/8″
Mounting depth	≈ 5 1/8″

“≈” 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/20070830083804/http://www.diamondaudio.com/PDF/archive/M6/M6

Other Diamond 10″ models

Diamond CM310D2 10″ · dual 2 Ω
Diamond CM310D4 10″ · dual 4 Ω
Diamond D102 10″ · dual 2 Ω
Diamond D104 10″ · dual 4 Ω
Diamond D310D2 10″ · dual 2 Ω
Diamond D310D4 10″ · dual 4 Ω
Diamond D610D2 10″ · dual 2 Ω
Diamond D610D4 10″ · dual 4 Ω
Diamond D910D2 10″ · dual 2 Ω
Diamond D910D4 10″ · dual 4 Ω
Diamond DE102 10″ · dual 2 Ω
Diamond DE104 10″ · dual 4 Ω

Similar 10″ subwoofers from other brands

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

Fi Audio Alpha v2.1 10 S2 0.49 ft³ sealed · 0.78 ft³ ported
Fi Audio Alpha v2.1 10 S4 0.49 ft³ sealed · 0.78 ft³ ported
DC Audio Level 4 M3 10 D1 0.48 ft³ sealed · 0.81 ft³ ported
DC Audio Level 4 M3 10 D2 0.48 ft³ sealed · 0.81 ft³ ported
DC Audio Level 4 M3 10 D4 0.48 ft³ sealed · 0.81 ft³ ported
Machete ML-10R D2 0.49 ft³ sealed · 0.85 ft³ ported

FAQ

What box does the Diamond M6mkII 10D4 need?

Recommended net volume: 0.46 ft³ sealed, 0.78 ft³ ported tuned to 38 Hz — for one sub in a sedan at 300 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.

What are the Diamond M6mkII 10D4 Thiele/Small specs?

Fs 40 Hz, Qts 0.49, Vas 0.43 ft³, Xmax 0.72″, Sd 49 in².