Monacor SPH-300CTC

12" · 4 Ω · 150 W · 94.6 dB

Thiele-Small parameters

Nominal size	12"
Impedance	4 Ω
Fs	18 Hz
Qts	0.185
Qes	0.19
Qms	6.5
Vas	225 L
Sd	495 cm²
Xmax	5.4 mm
Re	3 Ω
Bl	14.6 T·m
Mms	119.3 g
Pe	150 W
Sensitivity	94.6 dB

Alignment hint

EBP	95 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 16.5 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
Focal AUDIOM 12VX	23.5 +5.5	0.202 +0.02	238 +13	6 +0.6	94.5 -0.1	usable	8 Ω vs 4 Ω: amp load changes	+
Peerless XXLS12-4	17.7 -0.3	0.195 +0.01	156.5 -68.5	7.8 +2.4	92.9 -1.7	usable		+
Klipsch K31	19 +1	0.185 =	386 +161	5 -0.4	94.8 +0.2	usable	8 Ω vs 4 Ω: amp load changes · Xmax 5 mm < 5.4 mm: lower excursion-limited SPL	+
JBL 128-H vp ca1	21.2 +3.2	0.233 +0.05	222.7 -2.3	7.8 +2.4	93.1 -1.5	usable	8 Ω vs 4 Ω: amp load changes	+
JBL 2214H	23 +5	0.244 +0.06	223.7 -1.3	6.6 +1.2	93.9 -0.7	usable	8 Ω vs 4 Ω: amp load changes	+
JBL 128-H vp ca2	21.6 +3.6	0.24 +0.05	214.6 -10.4	7.7 +2.3	93.1 -1.5	usable	8 Ω vs 4 Ω: amp load changes	+
SEAS 33F-WKA	22 +4	0.209 +0.02	310 +85	5 -0.4	95 +0.4	usable	8 Ω vs 4 Ω: amp load changes · 70 W vs 150 W: lower power handling · Xmax 5 mm < 5.4 mm: lower excursion-limited SPL	+
Eminence W1238R	21.5 +3.5	0.252 +0.07	236.6 +11.6	8.2 +2.8	93.6 -1	usable	8 Ω vs 4 Ω: amp load changes	+
Phase Linear ALIANTE 12 LTD	19 +1	0.214 +0.03	151 -74	8 +2.6	92.6 -2	usable		+
Peerless XLS12	18.1 +0.1	0.199 +0.01	139.2 -85.8	9.5 +4.1	91.5 -3.1	usable		+

Compare the closest 3 against the SPH-300CTC →

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.