Eton 11-581/50 HEX

10" · 8 Ω · 150 W · 90.5 dB · datasheet ↗

Thiele-Small parameters

Nominal size	10"
Impedance	8 Ω
Fs	21 Hz
Qts	0.296
Qes	0.31
Qms	6.68
Vas	153 L
Sd	366 cm²
Xmax	5 mm
Re	5.2 Ω
Bl	12.5 T·m
Mms	70.5 g
Pe	150 W
Sensitivity	90.5 dB

Alignment hint

EBP	68 · flexible
Sealed Vb (Qtc ≈ 0.71)	≈ 32.5 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
Eton 11-581/50 HEX v2015	23 +2	0.299 =	151 -2	5 =	91.6 +1.1	close		+
Eton 11-612C8/50RP	23 +2	0.289 -0.01	152 -1	5 =	91.7 +1.2	close		+
Vifa WCF265	24 +3	0.305 +0.01	155.9 +2.9	5 =	91.5 +1	close	80 W vs 150 W: lower power handling	+
Volt B250.8	24 +3	0.298 =	126 -27	5.5 +0.5	90.3 -0.2	close		+
Monacor SPP-280	25 +4	0.292 =	145 -8	4.6 -0.4	91.7 +1.2	close	75 W vs 150 W: lower power handling · Xmax 4.6 mm < 5 mm: lower excursion-limited SPL	+
Eton 11-581/C8/50 HEX SII	24 +3	0.31 +0.01	134 -19	5 =	91.5 +1	close		+
Monacor SPH-250TC	24 +3	0.304 +0.01	130 -23	4.5 -0.5	90.2 -0.3	close	100 W vs 150 W: lower power handling · Xmax 4.5 mm < 5 mm: lower excursion-limited SPL	+
Scan-Speak 26W8867T00	19 -2	0.29 -0.01	176 +23	9 +4	89.3 -1.2	close		+
Scan-Speak 26W/8867T00	19 -2	0.29 -0.01	179 +26	9 +4	89.4 -1.1	close		+
Peerless 850146	22.6 +1.6	0.346 +0.05	144.4 -8.6	7.5 +2.5	89.8 -0.7	close		+

Compare the closest 3 against the 11-581/50 HEX →

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 (6)

FK BR 10subbass reflex
FK Mid Sealed 10midsealed
FK Top 10 1Wtopsealed
FK Top 10 2Wtopbass reflex
FK Top 10 Coax 2Wtopsealed
FK Top Coax 10topsealed