Tesla ARM 9408
Thiele-Small parameters
| Nominal size | 15" |
|---|---|
| Impedance | 8 Ω |
| Fs | 35 Hz |
| Qts | 0.248 |
| Qes | 0.26 |
| Qms | 5.5 |
| Vas | 260 L |
| Sd | 880 cm² |
| Xmax | 1.5 mm |
| Re | 6 Ω |
| Bl | 20.9 T·m |
| Mms | 86.3 g |
| Pe | 75 W |
| Sensitivity | 99.6 dB |
Alignment hint
| EBP | 135 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 36.5 L |
EBP > 100: favours a ported (bass-reflex) 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 |
|---|---|---|---|---|---|---|---|---|
| JBL E145 | 35 = | 0.249 = | 274.7 +14.7 | 4.1 +2.6 | 100 +0.4 | close | + | |
| Altec 418-8LF vp CF2 | 36.3 +1.3 | 0.254 +0.01 | 230.3 -29.7 | 1.3 -0.2 | 99.7 +0.1 | close | Xmax 1.3 mm < 1.5 mm: lower excursion-limited SPL | + |
| LaVoce WAF153.02 | 35 = | 0.261 +0.01 | 244 -16 | 4.6 +3.1 | 99.7 +0.1 | close | + | |
| Altec 421-8H-II | 38.7 +3.7 | 0.242 -0.01 | 261.4 +1.4 | 1.3 -0.2 | 101.1 +1.5 | close | Xmax 1.3 mm < 1.5 mm: lower excursion-limited SPL | + |
| Beyma 380 MSPA | 36 +1 | 0.246 = | 242.2 -17.8 | 3.6 +2.1 | 97.8 -1.8 | close | + | |
| Altec 3156 | 38 +3 | 0.24 -0.01 | 246.4 -13.6 | 3.8 +2.3 | 99.8 +0.2 | close | + | |
| Great Plains Audio 3156 GPA | 38 +3 | 0.24 -0.01 | 246.4 -13.6 | 3.8 +2.3 | 99.8 +0.2 | close | + | |
| Beyma 15GT200 v1990 | 34 -1 | 0.236 -0.01 | 276 +16 | 5 +3.5 | 99.4 -0.2 | close | + | |
| Celestion NTR15-3018E v2015 | 34.6 -0.4 | 0.245 = | 225.7 -34.3 | 5 +3.5 | 99.1 -0.5 | close | + | |
| Mercuriale PTR 385 M0 | 33 -2 | 0.264 +0.02 | 252 -8 | 3.5 +2 | 98.2 -1.4 | close | + |
Compare the closest 3 against the ARM 9408 →
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.