Mach 5 Audio FTW-LTE-21
Thiele-Small parameters
| Nominal size | 21.5" |
|---|---|
| Impedance | 4 Ω |
| Fs | 19.8 Hz |
| Qts | 0.643 |
| Qes | 0.7 |
| Qms | 7.92 |
| Vas | 526.1 L |
| Sd | 1640.3 cm² |
| Xmax | 10 mm |
| Re | 3.9 Ω |
| Bl | 17.9 T·m |
| Mms | 463.2 g |
| Pe | 450 W |
| Sensitivity | 92.8 dB |
Alignment hint
| EBP | 28 · sealed |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 2513.1 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 |
|---|---|---|---|---|---|---|---|---|
| Fane COLOSSUS 24 BASS RIPOLE | 21.1 +1.3 | 0.7 +0.06 | 503.3 -22.8 | 12.7 +2.7 | 90.1 -2.7 | close | 8 Ω vs 4 Ω: amp load changes | + |
| CSS Audio Maelstrom 21 DVC by Exodus Audio | 16.3 -3.5 | 0.389 -0.25 | 605 +78.9 | 16.3 +6.3 | 93 +0.2 | usable | + | |
| Mach 5 Audio FTW21 | 19.7 -0.1 | 0.378 -0.26 | 499.9 -26.2 | 7.5 -2.5 | 95.8 +3 | usable | Xmax 7.5 mm < 10 mm: lower excursion-limited SPL | + |
| MTX Audio T9922-44 | 16.8 -3 | 0.539 -0.1 | 239.1 -287 | 22.2 +12.2 | 91.5 -1.3 | risky | 2 Ω vs 4 Ω: amp load changes | + |
| Pyle Audio PDW21250 | 22.4 +2.6 | 0.331 -0.31 | 703.8 +177.7 | 9 -1 | 96.2 +3.4 | risky | 8 Ω vs 4 Ω: amp load changes · Xmax 9 mm < 10 mm: lower excursion-limited SPL | + |
| RCF LF 21X451 | 28 +8.2 | 0.369 -0.27 | 385 -141.1 | 13 +3 | 97 +4.2 | risky | 8 Ω vs 4 Ω: amp load changes | + |
| RCF LF 21N401 | 30 +10.2 | 0.378 -0.26 | 374 -152.1 | 10.6 +0.6 | 98 +5.2 | risky | 8 Ω vs 4 Ω: amp load changes | + |
| MCM Electronics 55-2985 | 25.9 +6.1 | 0.38 -0.26 | 705 +178.9 | 6.9 -3.1 | 97.6 +4.8 | risky | 8 Ω vs 4 Ω: amp load changes · 300 W vs 450 W: lower power handling · Xmax 6.9 mm < 10 mm: lower excursion-limited SPL | + |
| LaVoce SAF214.50 | 30 +10.2 | 0.435 -0.21 | 267 -259.1 | 11.6 +1.6 | 95.6 +2.8 | risky | 8 Ω vs 4 Ω: amp load changes | + |
| LaVoce SAF214.50 vp | 30 +10.2 | 0.401 -0.24 | 311 -215.1 | 11.6 +1.6 | 96.4 +3.6 | risky | 8 Ω vs 4 Ω: amp load changes | + |
Compare the closest 3 against the FTW-LTE-21 →
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.