Dayton Audio RSS460HO-4

18″ subwoofer · 4 Ω · 900 W RMS

18.8 HzFs, resonance

0.32Qts

9.61 ft³Vas

0.50″Xmax

900 WRMS

Source	parts-express.com · 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

Recommended box

For a sedan, one sub, 900 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

1.87 ft³ (53 L)

Net volume

Manufacturer spec: 2.90 ft³ · source

Bass character (Qtc)	Tight and punchy · 0.80
Fc	47 Hz
F3 (−3 dB, no cabin gain)	45 Hz
Example box (outside)	19 11/16″ × 19 11/16″ × 12 9/16″

Open sealed box in designer

Ported

deeper, louder

3.60 ft³ (102 L)

Net volume

Manufacturer spec: 3.60 ft³ · source

Tuning (Fb)	30 Hz
Port	slot 2 3/16 × 19 1/16″, 28 11/16″ long
Port velocity at 900 W	61 ft/s
F3 (−3 dB, no cabin gain)	30 Hz
Example box (outside)	31 1/2″ × 20 1/2″ × 15 3/4″

Open ported box in designer

Deeper: 5.58 ft³ (158 L) tuned to 25 Hz, 31 1/2″ × 20 1/2″ × 22 3/8″ 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	18″
Voice coils	4 Ω
RMS power	900 W
Fs	18.8 Hz
Qts	0.32
Qes	0.35
Qms	4.05
Vas	9.61 ft³

Re	3.2 Ω
Sd	180.4 in²
Xmax	0.50″
Vd	90.9 in³ calc.
Mms	505 g calc.
BL	23.4 T·m calc.
EBP	54 — sealed or ported calc.
Sensitivity, 1 W / 1 m	89.1 dB calc.

Mounting dimensions

Cutout diameter	16 11/16″
Mounting depth	8 15/16″
Overall diameter	18 3/16″

“≈” 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

parts-express.com/Dayton-Audio-RSS460HO-4-18-Reference-Series-HO-Subwoofer-4-ohm

Other Dayton Audio 18″ models

Dayton Audio SS18-22 18″ · dual 2 Ω
Dayton Audio UM18-22 18″ · dual 2 Ω
Dayton Audio UMII18-22 18″ · dual 2 Ω

Similar 18″ subwoofers from other brands

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

Crescendo Audio Contralto 18 D1 2.31 ft³ sealed · 5.33 ft³ ported
URAL Decibel 18 (1+1) 4.03 ft³ sealed · 5.40 ft³ ported
Pride S V.3 18 D2 2.31 ft³ sealed · 6.07 ft³ ported
Pride S V.3 18 D1 2.31 ft³ sealed · 6.07 ft³ ported
Fi Audio HT-3 18 S2 3.21 ft³ sealed · 5.54 ft³ ported
Fi Audio HT-3 18 S4 3.21 ft³ sealed · 5.54 ft³ ported

FAQ

What box does the Dayton Audio RSS460HO-4 need?

Recommended net volume: 1.87 ft³ sealed, 3.60 ft³ ported tuned to 30 Hz — for one sub in a sedan at 900 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.

What are the Dayton Audio RSS460HO-4 Thiele/Small specs?

Fs 18.8 Hz, Qts 0.32, Vas 9.61 ft³, Xmax 0.50″, Sd 180.4 in².

What is the Dayton Audio RSS460HO-4 mounting depth?

Mounting depth is 8 15/16″, cutout diameter 16 11/16″. The inside depth of the box must exceed the mounting depth by at least 1″.

How much power does the Dayton Audio RSS460HO-4 handle and how do I wire it?

RMS power rating: 900 W. Wiring for several subs and amp power — in the wiring calculator.