Helix P12W PRECISION

12" · 4 Ω · 400 W · 89 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	27 Hz
Qts	0.25
Qes	0.27
Qms	3.81
Vas	72 L
Sd	511 cm²
Xmax	8.5 mm
Re	3 Ω
Bl	18.1 T·m
Mms	179.1 g
Pe	400 W
Sensitivity	89 dB

Alignment hint

EBP	100 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 10.3 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
Celestion FTR12-4080DL	28.9 +1.9	0.303 +0.05	68.6 -3.4	8.7 +0.2	89.9 +0.9	close	8 Ω vs 4 Ω: amp load changes	+
BMS 12S330 v2016	28.6 +1.6	0.24 -0.01	85.5 +13.5	8 -0.5	92.3 +3.3	usable	8 Ω vs 4 Ω: amp load changes · Xmax 8 mm < 8.5 mm: lower excursion-limited SPL	+
BMS 12S330 v2018	28.6 +1.6	0.295 +0.04	81.4 +9.4	8 -0.5	91.1 +2.1	usable	8 Ω vs 4 Ω: amp load changes · Xmax 8 mm < 8.5 mm: lower excursion-limited SPL	+
Tang Band W8Q-1071F	27 =	0.334 +0.08	70.4 -1.6	9.7 +1.2	91.8 +2.8	usable		+
Dayton Audio RSS315HO-4 v2020	26.2 -0.8	0.303 +0.05	54 -18	8.6 +0.1	90.6 +1.6	usable		+
Dayton Audio RSS315HO-4 v2017	26.2 -0.8	0.303 +0.05	53.7 -18.3	8.6 +0.1	90.6 +1.6	usable		+
Audio System R12	27.7 +0.7	0.35 +0.1	84.3 +12.3	8.5 =	88.6 -0.4	usable		+
BMS 12S330	28.6 +1.6	0.24 -0.01	85.5 +13.5	8 -0.5	96 +7	usable	8 Ω vs 4 Ω: amp load changes · Xmax 8 mm < 8.5 mm: lower excursion-limited SPL	+
Alpine SWG-1244	28 +1	0.38 +0.13	75 +3	10 +1.5	87.7 -1.3	usable	250 W vs 400 W: lower power handling	+
Peerless XLS-P830500	20 -7	0.246 =	103.9 +31.9	8.6 +0.1	90.5 +1.5	usable	300 W vs 400 W: lower power handling	+

Compare the closest 3 against the P12W PRECISION →

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.