DD Audio DD25118C-D4 vp
Thiele-Small parameters
| Nominal size | 21.5" |
|---|---|
| Impedance | 8 Ω |
| Fs | 37 Hz |
| Qts | 0.841 |
| Qes | 1.084 |
| Qms | 3.756 |
| Vas | 103 L |
| Sd | 1753.1 cm² |
| Xmax | 4.1 mm |
| Re | 6.8 Ω |
| Bl | 33.6 T·m |
| Mms | 773.5 g |
| Pe | 1000 W |
| Sensitivity | 89.5 dB |
Alignment hint
| EBP | 34 · sealed |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | Qts too high |
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 |
|---|---|---|---|---|---|---|---|---|
| P.Audio SD-21 | 41 +4 | 0.412 -0.43 | 200.6 +97.6 | 5.7 +1.6 | 98.8 +9.3 | risky | + | |
| SICA 21 S 4 PL | 38.7 +1.7 | 0.431 -0.41 | 229.8 +126.8 | 6.4 +2.3 | 100 +10.5 | risky | 4 Ω vs 8 Ω: amp load changes | + |
| RCF LF 21N551 | 35 -2 | 0.331 -0.51 | 200 +97 | 7.7 +3.6 | 97.7 +8.2 | risky | + | |
| LaVoce SAF214.50 | 30 -7 | 0.435 -0.41 | 267 +164 | 11.6 +7.5 | 95.6 +6.1 | risky | + | |
| Beyma 21L50 | 33 -4 | 0.434 -0.41 | 300 +197 | 7.9 +3.8 | 97 +7.5 | risky | + | |
| Fane COLOSSUS 24 BASS RIPOLE | 21.1 -15.9 | 0.7 -0.14 | 503.3 +400.3 | 12.7 +8.6 | 90.1 +0.6 | risky | + | |
| P.Audio IMF HP-21W | 36.4 -0.6 | 0.463 -0.38 | 384.4 +281.4 | 6.6 +2.5 | 99.1 +9.6 | risky | + | |
| Beyma 21SW1600ND | 33 -4 | 0.382 -0.46 | 268 +165 | 8.9 +4.8 | 97.6 +8.1 | risky | + | |
| MTX Audio T9922-44 | 16.8 -20.2 | 0.539 -0.3 | 239.1 +136.1 | 22.2 +18.1 | 91.5 +2 | risky | 2 Ω vs 8 Ω: amp load changes | + |
| B&C 21 SW 115 | 32.5 -4.5 | 0.404 -0.44 | 268.7 +165.7 | 9.9 +5.8 | 99.2 +9.7 | risky | 4 Ω vs 8 Ω: amp load changes | + |
Compare the closest 3 against the DD25118C-D4 vp →
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.