KEF B139 SP1044
Thiele-Small parameters
| Nominal size | 10" |
|---|---|
| Impedance | 8 Ω |
| Fs | 25 Hz |
| Qts | 0.373 |
| Qes | 0.4 |
| Qms | 5.5 |
| Vas | 164 L |
| Sd | 354 cm² |
| Xmax | 6 mm |
| Re | 6.6 Ω |
| Bl | 10.6 T·m |
| Mms | 43.4 g |
| Pe | 50 W |
| Sensitivity | 90.9 dB |
Alignment hint
| EBP | 63 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 63.2 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
| Driver | Fs (Hz) | Qts | Vas (L) | Xmax (mm) | Sens (dB) | Fit | Notes | Compare |
|---|---|---|---|---|---|---|---|---|
| Scan-Speak 26W/8534G00 | 25 = | 0.368 -0.01 | 153 -11 | 6 = | 91.5 +0.6 | close | + | |
| Scan-Speak 26W/4534G00 | 23 -2 | 0.356 -0.02 | 156 -8 | 6 = | 92.3 +1.4 | close | 4 Ω vs 8 Ω: amp load changes | + |
| Scan-Speak 25W/8567-SE | 22 -3 | 0.367 -0.01 | 159 -5 | 7.5 +1.5 | 89.4 -1.5 | close | + | |
| Focal 10V 516J | 22.3 -2.7 | 0.39 +0.02 | 180 +16 | 7.5 +1.5 | 90.7 -0.2 | close | + | |
| Falcon Acoustics B139 SP1044 REMPLACEMENT | 25 = | 0.366 -0.01 | 127 -37 | 6 = | 89.5 -1.4 | close | + | |
| Scan-Speak 26W/8534G00 v2011 | 23 -2 | 0.402 +0.03 | 150 -14 | 6 = | 89.8 -1.1 | close | + | |
| SEAS A26RE4 - H1411-08 v2012 | 25 = | 0.387 +0.01 | 169 +5 | 4 -2 | 90.9 = | close | Xmax 4 mm < 6 mm: lower excursion-limited SPL | + |
| SEAS P25REX | 27 +2 | 0.437 +0.06 | 156.8 -7.2 | 6 = | 90.7 -0.2 | close | + | |
| SEAS P25REX/DD | 27 +2 | 0.437 +0.06 | 156.8 -7.2 | 6 = | 90.7 -0.2 | close | + | |
| Dayton Audio RS270S-8 | 26.9 +1.9 | 0.41 +0.04 | 147.2 -16.8 | 6 = | 90 -0.9 | close | + |
Compare the closest 3 against the B139 SP1044 →
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.