CSS Audio Maelstrom 21 DVC by Exodus Audio
Thiele-Small parameters
| Nominal size | 21.5" |
|---|---|
| Impedance | 4 Ω |
| Fs | 16.3 Hz |
| Qts | 0.389 |
| Qes | 0.44 |
| Qms | 3.38 |
| Vas | 605 L |
| Sd | 1550 cm² |
| Xmax | 16.3 mm |
| Re | 3.8 Ω |
| Bl | 21.7 T·m |
| Mms | 530.7 g |
| Pe | 1000 W |
| Sensitivity | 93 dB |
Alignment hint
| EBP | 37 · sealed |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 262.6 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 |
|---|---|---|---|---|---|---|---|---|
| Mach 5 Audio FTW21 | 19.7 +3.4 | 0.378 -0.01 | 499.9 -105.1 | 7.5 -8.8 | 95.8 +2.8 | usable | 600 W vs 1000 W: lower power handling · Xmax 7.5 mm < 16.3 mm: lower excursion-limited SPL | + |
| Pyle Audio PDW21250 | 22.4 +6.1 | 0.331 -0.06 | 703.8 +98.8 | 9 -7.3 | 96.2 +3.2 | risky | 8 Ω vs 4 Ω: amp load changes · Xmax 9 mm < 16.3 mm: lower excursion-limited SPL | + |
| Mach 5 Audio FTW-LTE-21 | 19.8 +3.5 | 0.643 +0.25 | 526.1 -78.9 | 10 -6.3 | 92.8 -0.2 | risky | 450 W vs 1000 W: lower power handling · Xmax 10 mm < 16.3 mm: lower excursion-limited SPL | + |
| MTX Audio T9922-44 | 16.8 +0.5 | 0.539 +0.15 | 239.1 -365.9 | 22.2 +5.9 | 91.5 -1.5 | risky | 2 Ω vs 4 Ω: amp load changes | + |
| RCF LF 21X451 | 28 +11.7 | 0.369 -0.02 | 385 -220 | 13 -3.3 | 97 +4 | risky | 8 Ω vs 4 Ω: amp load changes · Xmax 13 mm < 16.3 mm: lower excursion-limited SPL | + |
| MCM Electronics 55-2985 | 25.9 +9.6 | 0.38 -0.01 | 705 +100 | 6.9 -9.4 | 97.6 +4.6 | risky | 8 Ω vs 4 Ω: amp load changes · 300 W vs 1000 W: lower power handling · Xmax 6.9 mm < 16.3 mm: lower excursion-limited SPL | + |
| Fane COLOSSUS 24 BASS RIPOLE | 21.1 +4.8 | 0.7 +0.31 | 503.3 -101.7 | 12.7 -3.6 | 90.1 -2.9 | risky | 8 Ω vs 4 Ω: amp load changes · Xmax 12.7 mm < 16.3 mm: lower excursion-limited SPL | + |
| hertz Hertz Audio ML5400D | 20.7 +4.4 | 0.303 -0.09 | 613 +8 | 8.5 -7.8 | 102.9 +9.9 | risky | 2 Ω vs 4 Ω: amp load changes · Xmax 8.5 mm < 16.3 mm: lower excursion-limited SPL | + |
| RCF LF 21N401 | 30 +13.7 | 0.378 -0.01 | 374 -231 | 10.6 -5.7 | 98 +5 | risky | 8 Ω vs 4 Ω: amp load changes · Xmax 10.6 mm < 16.3 mm: lower excursion-limited SPL | + |
| Beyma 21L45 | 25 +8.7 | 0.275 -0.11 | 660 +55 | 9 -7.3 | 98.7 +5.7 | risky | 8 Ω vs 4 Ω: amp load changes · Xmax 9 mm < 16.3 mm: lower excursion-limited SPL | + |
Compare the closest 3 against the Maelstrom 21 DVC by Exodus Audio →
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.