Audiotechnology FLEXUNIT 12B775210KAP Custom

12" · 8 Ω · 250 W · 91.2 dB · datasheet ↗

Thiele-Small parameters

Nominal size	12"
Impedance	8 Ω
Fs	19 Hz
Qts	0.382
Qes	0.41
Qms	5.5
Vas	340 L
Sd	515 cm²
Xmax	8.6 mm
Re	5.5 Ω
Bl	11.1 T·m
Mms	76.7 g
Pe	250 W
Sensitivity	91.2 dB

Alignment hint

EBP	46 · sealed
Sealed Vb (Qtc ≈ 0.71)	≈ 140.1 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
Audiotechnology FLEXUNIT 12D775210KAP Custom	19 =	0.388 +0.01	340 =	8.6 =	91.1 -0.1	close		+
SB Acoustics SB34NRX75-6	19 =	0.397 +0.02	260 -80	11 +2.4	91 -0.2	close		+
Davis 31ST12M v2009	22 +3	0.39 +0.01	398 +58	9 +0.4	91.8 +0.6	close	100 W vs 250 W: lower power handling	+
Wharfedale 3014	20.7 +1.7	0.342 -0.04	319.1 -20.9	8 -0.6	92.2 +1	close	100 W vs 250 W: lower power handling · Xmax 8 mm < 8.6 mm: lower excursion-limited SPL	+
Visaton WS300	22 +3	0.321 -0.06	340 =	8 -0.6	92.5 +1.3	usable	150 W vs 250 W: lower power handling · Xmax 8 mm < 8.6 mm: lower excursion-limited SPL	+
Focal 12V 726	19 =	0.267 -0.11	340 =	9 +0.4	92 +0.8	usable	150 W vs 250 W: lower power handling	+
Audiotechnology FLEXUNITS 12 D 77 25 10 KAP	19 =	0.25 -0.13	340 =	8.6 =	91.3 +0.1	usable		+
Davis 31ST12M	24 +5	0.399 +0.02	260 -80	8.9 +0.3	91.6 +0.4	usable	100 W vs 250 W: lower power handling	+
Davis 31ST12M v2011	24 +5	0.399 +0.02	260 -80	8.9 +0.3	91.6 +0.4	usable	100 W vs 250 W: lower power handling	+
SEAS 33F-WK MH	21.6 +2.6	0.383 =	327.7 -12.3	5 -3.6	92.1 +0.9	usable	80 W vs 250 W: lower power handling · Xmax 5 mm < 8.6 mm: lower excursion-limited SPL	+

Compare the closest 3 against the FLEXUNIT 12B775210KAP Custom →

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)

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