Monacor SONIC 15 MK2

15" · 4 Ω · 350 W · 88.2 dB

Thiele-Small parameters

Nominal size	15"
Impedance	4 Ω
Fs	22 Hz
Qts	0.577
Qes	0.63
Qms	6.82
Vas	119 L
Sd	830 cm²
Xmax	6.3 mm
Re	3.8 Ω
Bl	18.8 T·m
Mms	424.7 g
Pe	350 W
Sensitivity	88.2 dB

Alignment hint

EBP	35 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 237.1 L

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
Rockford Fosgate P3D4-15	22.4 +0.4	0.566 -0.01	155.8 +36.8	11 +4.7	87.3 -0.9	close	8 Ω vs 4 Ω: amp load changes	+
Sony XS-L156P5	25 +3	0.622 +0.05	109.9 -9.1	5.5 -0.8	90.2 +2	usable	Xmax 5.5 mm < 6.3 mm: lower excursion-limited SPL	+
Soundstream R1-15	23.7 +1.7	0.62 +0.04	136.6 +17.6	17.2 +10.9	87.2 -1	usable	8 Ω vs 4 Ω: amp load changes	+
JBL P1520	25.4 +3.4	0.502 -0.07	118.9 -0.1	8.1 +1.8	90.8 +2.6	usable		+
JBL P1520e	25.4 +3.4	0.502 -0.07	118.9 -0.1	8.1 +1.8	90.8 +2.6	usable		+
Sony XS-L154P5B	25.6 +3.6	0.607 +0.03	132.4 +13.4	5.6 -0.7	90.4 +2.2	usable	Xmax 5.6 mm < 6.3 mm: lower excursion-limited SPL	+
MTX Audio T615-44	26.2 +4.2	0.498 -0.08	113 -6	5.6 -0.7	88.8 +0.6	usable	8 Ω vs 4 Ω: amp load changes · 250 W vs 350 W: lower power handling · Xmax 5.6 mm < 6.3 mm: lower excursion-limited SPL	+
Rockford Fosgate P115S4	24 +2	0.62 +0.04	172 +53	8 +1.7	87.3 -0.9	usable	200 W vs 350 W: lower power handling	+
Rockford Fosgate T0D415	26.2 +4.2	0.521 -0.06	94.4 -24.6	9.7 +3.4	88 -0.2	usable	8 Ω vs 4 Ω: amp load changes	+
Hertz Audio HX 380	30 +8	0.55 -0.03	123.2 +4.2	14 +7.7	89.1 +0.9	usable		+

Compare the closest 3 against the SONIC 15 MK2 →

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.