Dayton Audio RSS315HF-4

12″ subwoofer · 4 Ω · 400 W RMS

24.2 HzFs, resonance
0.39Qts
2.97 ft³Vas
0.56″Xmax
400 WRMS
Sourceparts-express.com · manufacturer data
Checked against sourceOctober 2026
Thiele/Small parameterscomplete
Mounting dimensions3 of 4 — missing: magnet diameter; the designer will use an estimate

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

smaller, tighter
0.92 ft³ (26 L)
Net volume

Manufacturer spec: 1.01 ft³ · source

Bass character (Qtc)Tight and punchy · 0.80
Fc50 Hz
F3 (−3 dB, no cabin gain)48 Hz
Example box (outside)14 3/16″ × 14 3/16″ × 12 5/16″
Open sealed box in designer

Ported

deeper, louder
2.12 ft³ (60 L)
Net volume

Manufacturer spec: 2.10 ft³ · source

Tuning (Fb)30 Hz
Portslot 1 9/16 × 14 5/16″, 27 11/16″ long
Port velocity at 400 W58 ft/s
F3 (−3 dB, no cabin gain)29 Hz
Example box (outside)31 1/2″ × 15 3/4″ × 12 5/16″
Open ported box in designer

Deeper: 2.93 ft³ (83 L) tuned to 27 Hz, 31 1/2″ × 15 3/4″ × 15 3/4″ outside — a bigger box with flatter deep bass. Open in the calculator

Where to buy Amazon
203040506080100150200606672788490HzdB
Sealed Ported · SPL in dB at 1 W / 1 m, no cabin gain

Thiele/Small parameters

Size12″
Voice coils4 Ω
RMS power400 W
Fs24.2 Hz
Qts0.39
Qes0.45
Qms2.83
Vas2.97 ft³
Re3.1 Ω
Sd79.8 in²
Xmax0.56″
Vd44.9 in³ calc.
Mms193 g calc.
BL14.2 T·m calc.
EBP54 — sealed or ported calc.
Sensitivity, 1 W / 1 m86.2 dB calc.

Mounting dimensions

Ø12 3/8″cutout Ø11 1/8″mounting depth 5 3/4″magnet Ø≈ 7 3/16″
Cutout diameter11 1/8″
Mounting depth5 3/4″
Overall diameter12 3/8″

“≈” 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

Other Dayton Audio 12″ models

Similar 12″ subwoofers from other brands

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

FAQ

What box does the Dayton Audio RSS315HF-4 need?

Recommended net volume: 0.92 ft³ sealed, 2.12 ft³ ported tuned to 30 Hz — for one sub in a sedan at 400 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.

What are the Dayton Audio RSS315HF-4 Thiele/Small specs?

Fs 24.2 Hz, Qts 0.39, Vas 2.97 ft³, Xmax 0.56″, Sd 79.8 in².

What is the Dayton Audio RSS315HF-4 mounting depth?

Mounting depth is 5 3/4″, cutout diameter 11 1/8″. The inside depth of the box must exceed the mounting depth by at least 1″.

How much power does the Dayton Audio RSS315HF-4 handle and how do I wire it?

RMS power rating: 400 W. Wiring for several subs and amp power — in the wiring calculator.