Altec Lansing 414-8C
Best box: 39.2 L bass reflex tuned to 51.7 Hz · F3 61.9 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Altec Lansing 414-8C does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
⚠️ Engineering Notice for Builders
- Limited linear excursion (Xmax: 3.81 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 39.2 Liters |
| Tuning Frequency (Fb) | 51.7 Hz |
| F3 (-3 dB Cutoff) | 61.9 Hz |
| F6 / F10 Extension | 52.1 Hz / 44.2 Hz |
| Port Inner Diameter | Ø 7.5 cm |
| Port Physical Length | 7.3 cm |
| First Pipe Resonance | 2364.0 Hz |
| Estimated MOL @ F3 | 118.7 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 22.3 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 95.5 Hz |
| F3 (-3 dB Cutoff) | 96.9 Hz |
| F6 / F10 Extension | 72.9 Hz / 54.7 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 30.2 Hz |
| Total Q (Qts) | 0.21 |
| Electrical Q (Qes) | 0.216 |
| Mechanical Q (Qms) | 7.4 |
| Equivalent Volume (Vas) | 230.2 Liters |
| Diaphragm Area (Sd) | 507.5 cm² |
| DC Resistance (Re) | 6.7 Ω |
| Efficiency Bandwidth Product (EBP) | 139.7 |
| Linear Excursion (Xmax) | 3.8 mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 12.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Altec Lansing 414-8C?
Load Forge's calculated alignment puts Altec Lansing 414-8C in a 39.2 liter vented enclosure tuned to 51.7 Hz, reaching an F3 cutoff of approximately 61.9 Hz.
Can Altec Lansing 414-8C be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 22.3 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 96.9 Hz.
What port dimensions should be used for Altec Lansing 414-8C to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 7.5 cm with a length of 7.3 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
Embed this design card on DIYAudio, AVSForum, Reddit, or Facebook. It shows the calculated F3, MOL (when the power rating is published) and box parameters.
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