Polk Audio DB1040

10" · 4 Ω · 270 W · 85 dB · datasheet ↗

Thiele-Small parameters

Nominal size	10"
Impedance	4 Ω
Fs	35 Hz
Qts	0.55
Qes	0.585
Qms	9.1
Vas	28.3 L
Sd	350 cm²
Xmax	7.5 mm
Re	3.5 Ω
Bl	12.9 T·m
Mms	126.9 g
Pe	270 W
Sensitivity	85 dB

Alignment hint

EBP	60 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 43.3 L

EBP 50-100: works in either a sealed or ported alignment.

Rules of thumb from T/S parameters only. Verify against a real simulation before cutting wood.

Substitute candidates

Driver	Fs (Hz)	Qts	Vas (L)	Xmax (mm)	Sens (dB)	Fit	Notes	Compare
American Bass SL 104	33.6 -1.4	0.52 -0.03	26.8 -1.5	8.5 +1	84.3 -0.7	close		+
Hertz Audio DS 250.3	36 +1	0.62 +0.07	29 +0.7	10 +2.5	84.8 -0.2	close	200 W vs 270 W: lower power handling	+
Sony XS-GTR100L	40 +5	0.56 +0.01	27 -1.3	7.5 =	86.2 +1.2	close		+
Boston Acoustics COMPETITOR 1000S4	34 -1	0.53 -0.02	35 +6.7	8.5 +1	85.7 +0.7	close		+
Morel PRIMO 104	35 =	0.56 +0.01	38 +9.7	8 +0.5	85.6 +0.6	close		+
Focal R-250S	35.4 +0.4	0.596 +0.05	28.1 -0.2	7 -0.5	88.2 +3.2	close	Xmax 7 mm < 7.5 mm: lower excursion-limited SPL	+
Gladen RS-X 10	35.57 +0.57	0.46 -0.09	27.8 -0.5	10 +2.5	85.9 +0.9	close		+
JL Audio 10W0V3-4	32.1 -2.9	0.604 +0.05	31 +2.7	8.7 +1.2	86.7 +1.7	close	8 Ω vs 4 Ω: amp load changes	+
JL Audio 10W0V3-4	32.09 -2.91	0.604 +0.05	31 +2.7	11.4 +3.9	84.07 -0.93	close		+
Wavecor SW275BD01	30.8 -4.2	0.564 +0.01	31 +2.7	6.9 -0.6	87.2 +2.2	close	180 W vs 270 W: lower power handling · Xmax 6.9 mm < 7.5 mm: lower excursion-limited SPL	+

Compare the closest 3 against the DB1040 →

Ranked on parameter similarity only (Qts, Fs, Vas, Xmax, sensitivity). Same nominal size required. A hint, not a simulation, model the swap before cutting or buying.

Used in enclosures (0)

No enclosure in the catalog uses this driver yet.