Audiotechnology FLEXUNITS 12 B 77 25 10

12" · 8 Ω · 125 W · 92.4 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	25 Hz
Qts	0.3
Qes	0.34
Qms	2.5
Vas	250 L
Sd	515 cm²
Xmax	4.3 mm
Re	5.39 Ω
Bl	12.24 T·m
Mms	60.2 g
Pe	125 W
Sensitivity	92.4 dB

Alignment hint

EBP	74 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 54.9 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
Audiotechnology FLEXUNIT 12B772510	25 =	0.299 =	250 =	8.6 +4.3	94.3 +1.9	close		+
Fostex W 300 A	25 =	0.281 -0.02	227 -23	4.6 +0.3	93.4 +1	close	50 W vs 125 W: lower power handling	+
Fostex W 300 AII	25 =	0.281 -0.02	227 -23	4.6 +0.3	93.4 +1	close	50 W vs 125 W: lower power handling	+
Philips AD12200/W8	24 -1	0.303 =	287.4 +37.4	5 +0.7	93.6 +1.2	close	80 W vs 125 W: lower power handling	+
Celestion T1600	22.5 -2.5	0.302 =	245.5 -4.5	4 -0.3	94.4 +2	close	80 W vs 125 W: lower power handling · Xmax 4 mm < 4.3 mm: lower excursion-limited SPL	+
Fostex FW 305	25 =	0.254 -0.05	254 +4	4.8 +0.5	94.3 +1.9	close	60 W vs 125 W: lower power handling	+
Audax HD33S66 vp - AP	26 +1	0.286 -0.01	228 -22	3.5 -0.8	92.9 +0.5	close	Xmax 3.5 mm < 4.3 mm: lower excursion-limited SPL	+
MCM Electronics 55-1465 DVC 8 Ohms en série 16 Oh	25 =	0.29 -0.01	203.8 -46.2	5 +0.7	90.3 -2.1	close	16 Ω vs 8 Ω: amp load changes	+
Tonsil GDN 30/80/2	25 =	0.26 -0.04	270 +20	6 +1.7	93.5 +1.1	close	80 W vs 125 W: lower power handling	+
Monacor SPH-300KE	22 -3	0.331 +0.03	250 =	6.5 +2.2	91.8 -0.6	close		+

Compare the closest 3 against the FLEXUNITS 12 B 77 25 10 →

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.