← all drivers

B&C 21 SW 115

21.5" · 4 Ω · 1700 W · 99.2 dB · datasheet ↗

Thiele-Small parameters

Nominal size21.5"
Impedance4 Ω
Fs32.5 Hz
Qts0.404
Qes0.42
Qms10.3
Vas268.7 L
Sd1680 cm²
Xmax9.9 mm
Re3.31 Ω
Bl23.9 T·m
Mms354 g
Pe1700 W
Sensitivity99.2 dB

Alignment hint

EBP77 · flexible
Sealed Vb (Qtc ≈ 0.71)≈ 130.2 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

DriverFs (Hz)QtsVas (L)Xmax (mm)Sens (dB)FitNotesCompare
Beyma 21SW1600ND33 +0.50.382 -0.02268 -0.78.9 -197.6 -1.6close8 Ω vs 4 Ω: amp load changes · Xmax 8.9 mm < 9.9 mm: lower excursion-limited SPL+
B&C 21 SW 115 v201533 +0.50.353 -0.05278 +9.39.3 -0.6100.6 +1.4closeXmax 9.3 mm < 9.9 mm: lower excursion-limited SPL+
LaVoce SAF214.50 vp30 -2.50.401 =311 +42.311.6 +1.796.4 -2.8close8 Ω vs 4 Ω: amp load changes+
LaVoce SAF214.5030 -2.50.435 +0.03267 -1.711.6 +1.795.6 -3.6close8 Ω vs 4 Ω: amp load changes+
Ciare NDC 21-532.2 -0.30.344 -0.06270.8 +2.18.8 -1.197.2 -2close8 Ω vs 4 Ω: amp load changes · Xmax 8.8 mm < 9.9 mm: lower excursion-limited SPL+
Beyma 21L5033 +0.50.434 +0.03300 +31.37.9 -297 -2.2usable8 Ω vs 4 Ω: amp load changes · 1000 W vs 1700 W: lower power handling · Xmax 7.9 mm < 9.9 mm: lower excursion-limited SPL+
RCF LF 21N40130 -2.50.378 -0.03374 +105.310.6 +0.798 -1.2usable8 Ω vs 4 Ω: amp load changes+
SB Audience NERO-21SW1100D32 -0.50.339 -0.06312.6 +43.98.1 -1.898.6 -0.6usable8 Ω vs 4 Ω: amp load changes · 1100 W vs 1700 W: lower power handling · Xmax 8.1 mm < 9.9 mm: lower excursion-limited SPL+
MC Kenzie FRL-21/1200-LF30 -2.50.378 -0.03374 +105.39.5 -0.498 -1.2usable8 Ω vs 4 Ω: amp load changes · 1200 W vs 1700 W: lower power handling · Xmax 9.5 mm < 9.9 mm: lower excursion-limited SPL+
18 Sound 21NLW900029 -3.50.347 -0.06304 +35.310.7 +0.896.4 -2.8usable8 Ω vs 4 Ω: amp load changes+

Compare the closest 3 against the 21 SW 115 →

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.