Usher Audio 15HM Studio

15" · 8 Ω · 150 W · 98 dB · datasheet ↗

Thiele-Small parameters

Nominal size	15"
Impedance	8 Ω
Fs	27 Hz
Qts	0.28
Qes	0.29
Qms	8.1
Vas	385 L
Sd	902 cm²
Xmax	5.9 mm
Re	5.2 Ω
Bl	17.7 T·m
Mms	102.9 g
Pe	150 W
Sensitivity	98 dB

Alignment hint

EBP	93 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 71.6 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
Davis 40RCA15	27 =	0.282 =	350 -35	5 -0.9	97.7 -0.3	close	Xmax 5 mm < 5.9 mm: lower excursion-limited SPL	+
Davis 40RCA15DF	27 =	0.282 =	350 -35	5 -0.9	97.7 -0.3	close	Xmax 5 mm < 5.9 mm: lower excursion-limited SPL	+
Davis 40RCADF	27 =	0.282 =	350 -35	5 -0.9	97.7 -0.3	close	Xmax 5 mm < 5.9 mm: lower excursion-limited SPL	+
Kenwood TRIO	27 =	0.27 -0.01	350 -35	5 -0.9	97.4 -0.6	close	Xmax 5 mm < 5.9 mm: lower excursion-limited SPL	+
Beyma 15k200	27 =	0.262 -0.02	345 -40	7.5 +1.6	97 -1	close		+
Beyma SM115/N	29 +2	0.291 +0.01	430 +45	7.3 +1.4	98.3 +0.3	close		+
Beyma SM-115/K	27 =	0.253 -0.03	345 -40	8 +2.1	97.5 -0.5	close		+
Rockford Fosgate PWR-415	24 -3	0.283 =	334 -51	6.2 +0.3	97.4 -0.6	close	4 Ω vs 8 Ω: amp load changes	+
Focal 15VX	24 -3	0.286 +0.01	380 -5	6 +0.1	95.3 -2.7	close		+
Monacor SPH-390TC vp1	22.7 -4.3	0.276 =	351 -34	6.4 +0.5	97.3 -0.7	close	4 Ω vs 8 Ω: amp load changes	+

Compare the closest 3 against the 15HM Studio →

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.