Cabasse 55NDS
Thiele-Small parameters
| Nominal size | 21.5" |
|---|---|
| Impedance | 8 Ω |
| Fs | 23.5 Hz |
| Qts | 0.369 |
| Qes | 0.39 |
| Qms | 6.8 |
| Vas | 975 L |
| Sd | 1800 cm² |
| Xmax | 4.2 mm |
| Re | 5.5 Ω |
| Bl | 21.1 T·m |
| Mms | 213.7 g |
| Pe | 200 W |
| Sensitivity | 98.7 dB |
Alignment hint
| EBP | 60 · flexible |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 364.9 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 |
|---|---|---|---|---|---|---|---|---|
| MCM Electronics 55-2985 | 25.9 +2.4 | 0.38 +0.01 | 705 -270 | 6.9 +2.7 | 97.6 -1.1 | usable | + | |
| Pyle Audio PDW21250 | 22.4 -1.1 | 0.331 -0.04 | 703.8 -271.2 | 9 +4.8 | 96.2 -2.5 | usable | + | |
| Beyma 21L45 | 25 +1.5 | 0.275 -0.09 | 660 -315 | 9 +4.8 | 98.7 = | usable | + | |
| Mach 5 Audio FTW21 | 19.7 -3.8 | 0.378 +0.01 | 499.9 -475.1 | 7.5 +3.3 | 95.8 -2.9 | usable | 4 Ω vs 8 Ω: amp load changes | + |
| hertz Hertz Audio ML5400D | 20.7 -2.8 | 0.303 -0.07 | 613 -362 | 8.5 +4.3 | 102.9 +4.2 | usable | 2 Ω vs 8 Ω: amp load changes | + |
| RCF LF 21X451 | 28 +4.5 | 0.369 = | 385 -590 | 13 +8.8 | 97 -1.7 | risky | + | |
| Beyma 21PW1400FE | 30 +6.5 | 0.343 -0.03 | 401.5 -573.5 | 10 +5.8 | 98.6 -0.1 | risky | + | |
| MC Kenzie FRL-21/1200-LF | 30 +6.5 | 0.378 +0.01 | 374 -601 | 9.5 +5.3 | 98 -0.7 | risky | + | |
| RCF LF 21N401 | 30 +6.5 | 0.378 +0.01 | 374 -601 | 10.6 +6.4 | 98 -0.7 | risky | + | |
| PD PD 2150 | 22 -1.5 | 0.193 -0.18 | 628 -347 | 6 +1.8 | 98.9 +0.2 | risky | + |
Compare the closest 3 against the 55NDS →
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.