Polk Audio SR104

10″ subwoofer · 4 Ω · 700 W RMS

35 HzFs, resonance

0.47Qts

0.78 ft³Vas

0.64″Xmax

700 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

Recommended box

For a sedan, one sub, 700 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

0.49 ft³ (14 L)

Net volume

Bass character (Qtc)	Flat and accurate · 0.75
Fc	56 Hz
F3 (−3 dB, no cabin gain)	56 Hz
Example box (outside)	12 3/16″ × 12 3/16″ × 9 11/16″

Open sealed box in designer

Ported

deeper, louder

0.85 ft³ (24 L)

Net volume

Tuning (Fb)	42 Hz
Port	2 round ports Ø2 1/2″, 16″ long
Port velocity at 700 W	142 ft/s
F3 (−3 dB, no cabin gain)	38 Hz
Example box (outside)	16 11/16″ × 15 3/4″ × 9 7/16″

At 700 W this example’s port will be noisy: air speed 142 ft/s, while the limit is 82 ft/s. It stays quiet up to about 230 W. Full power needs a port of at least 17.2 in², which means a bigger box than this example — size it in the designer.

Open ported box in designer

Deeper: 1.31 ft³ (37 L) tuned to 32 Hz, 21 3/8″ × 15 3/4″ × 14 3/16″ 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	4 Ω
RMS power	700 W
Fs	35 Hz
Qts	0.47
Qes	0.5
Qms	6.8
Vas	0.78 ft³

Re	3.5 Ω
Sd	53.7 in²
Xmax	0.64″
Vd	34.5 in³ calc.
Mms	160 g calc.
BL	15.7 T·m calc.
EBP	70 — sealed or ported calc.
Sensitivity, 1 W / 1 m	84.8 dB calc.

Mounting dimensions

Cutout diameter	9 1/8″
Mounting depth	7″
Overall diameter	10 1/4″

“≈” 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/20121103004437/http://www.polkaudio.com/downloads/manual/SRS

Other Polk Audio 10″ models

Polk Audio db104 10″ · 4 Ω
Polk Audio db104DVC 10″ · dual 4 Ω
Polk Audio db1040 10″ · 4 Ω
Polk Audio db1040DVC 10″ · dual 4 Ω
Polk Audio dX10-4 10″ · 4 Ω
Polk Audio dX10-8 10″ · 8 Ω
Polk Audio DXi104 DVC 10″ · dual 4 Ω
Polk Audio DXi104 SVC 10″ · 4 Ω
Polk Audio EX10 (EX Series II) 10″ · 4 Ω
Polk Audio GXR104 10″ · 4 Ω
Polk Audio MM100-4 10″ · 4 Ω
Polk Audio MM104 (Polk/MOMO) 10″ · 4 Ω

Similar 10″ subwoofers from other brands

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

Alpine SWS-10D4 (Type-S) 0.46 ft³ sealed · 0.81 ft³ ported
Sundown Audio HZ-10 D4 0.49 ft³ sealed · 0.85 ft³ ported
Machete MF-10S D4 0.49 ft³ sealed · 0.85 ft³ ported
Pioneer TS-Z10LS2 0.49 ft³ sealed · 0.85 ft³ ported
American Bass DX-104 0.46 ft³ sealed · 0.81 ft³ ported
Machete MF-10S D2 0.49 ft³ sealed · 0.85 ft³ ported

FAQ

What box does the Polk Audio SR104 need?

Recommended net volume: 0.49 ft³ sealed, 0.85 ft³ ported tuned to 42 Hz — for one sub in a sedan at 700 W. Fit the box to your space and amp in the free calculator, with plans and a cut sheet.

What are the Polk Audio SR104 Thiele/Small specs?

Fs 35 Hz, Qts 0.47, Vas 0.78 ft³, Xmax 0.64″, Sd 53.7 in².

What is the Polk Audio SR104 mounting depth?

Mounting depth is 7″, cutout diameter 9 1/8″. The inside depth of the box must exceed the mounting depth by at least 1″.

How much power does the Polk Audio SR104 handle and how do I wire it?

RMS power rating: 700 W. Wiring for several subs and amp power — in the wiring calculator.