MCM Electronics 55-5725

12" · 8 Ω · 100 W · 86.2 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	39.3 Hz
Qts	0.709
Qes	1.3
Qms	1.56
Vas	53.4 L
Sd	530.9 cm²
Xmax	2.5 mm
Re	7.6 Ω
Bl	13.2 T·m
Mms	121.3 g
Pe	100 W
Sensitivity	86.2 dB

Alignment hint

EBP	30 · sealed
Sealed Vb (Qtc ≈ 0.71)	Qts too high

EBP < 50: favours a sealed (closed) 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
Ground Zero GZIW 300X	34.9 -4.4	0.69 -0.02	53.6 +0.2	7.5 +5	86.6 +0.4	close	4 Ω vs 8 Ω: amp load changes	+
Pioneer TS-A30S4	39.2 -0.1	0.7 -0.01	56.1 +2.7	6.6 +4.1	92.1 +5.9	usable	4 Ω vs 8 Ω: amp load changes	+
Hertz Audio ES 300.5	35 -4.3	0.66 -0.05	48.5 -4.9	9 +6.5	86.6 +0.4	usable	4 Ω vs 8 Ω: amp load changes	+
Fountek FW300	37.3 -2	0.783 +0.07	50.1 -3.3	5.5 +3	89.8 +3.6	usable	4 Ω vs 8 Ω: amp load changes	+
Selenium 12SW3A DVC 2+2	35 -4.3	0.724 +0.02	49 -4.4	6.5 +4	89.6 +3.4	usable	4 Ω vs 8 Ω: amp load changes	+
Monacor SP-302PA-8	45 +5.7	0.881 +0.17	51 -2.4	2.3 -0.2	87.1 +0.9	usable	Xmax 2.3 mm < 2.5 mm: lower excursion-limited SPL	+
Selenium 12SW13ADVC 4+4	37 -2.3	0.854 +0.15	47 -6.4	7 +4.5	86.2 =	usable		+
Infinity Kappa 123WDSSI 2Ohm	34.2 -5.1	0.778 +0.07	58.6153 +5.22	10.2 +7.7	86.0429 -0.16	usable	2 Ω vs 8 Ω: amp load changes	+
Powerbass S-12T	34.4 -4.9	0.634 -0.07	45.92 -7.48	6.9 +4.4	85.8 -0.4	usable	4 Ω vs 8 Ω: amp load changes	+
Hertz Audio ES F30.5	38 -1.3	0.6 -0.11	60 +6.6	6 +3.5	88.6 +2.4	usable	4 Ω vs 8 Ω: amp load changes	+

Compare the closest 3 against the 55-5725 →

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.