Altec Lansing 405-8H
Best box: 6.4 L bass reflex tuned to 74.6 Hz · F3 70.1 Hz
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Comparable 5.25" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Altec Lansing 405-8H 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: 1.27 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) | 6.4 Liters |
| Tuning Frequency (Fb) | 74.6 Hz |
| F3 (-3 dB Cutoff) | 70.1 Hz |
| F6 / F10 Extension | 62.5 Hz / 55.7 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 12.9 cm |
| First Pipe Resonance | 1328.0 Hz |
| Estimated MOL @ F3 | 99.0 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 3.4 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 131.7 Hz |
| F3 (-3 dB Cutoff) | 133.3 Hz |
| F6 / F10 Extension | 100.8 Hz / 76.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 90.0 Hz |
| Total Q (Qts) | 0.47 |
| Electrical Q (Qes) | 0.56 |
| Mechanical Q (Qms) | 2.92 |
| Equivalent Volume (Vas) | 4.2 Liters |
| Diaphragm Area (Sd) | 77.4 cm² |
| DC Resistance (Re) | 6.0 Ω |
| Efficiency Bandwidth Product (EBP) | 160.7 |
| Linear Excursion (Xmax) | 1.3 mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 5.25" |
| 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 405-8H?
Load Forge's calculated alignment puts Altec Lansing 405-8H in a 6.4 liter vented enclosure tuned to 74.6 Hz, reaching an F3 cutoff of approximately 70.1 Hz.
Can Altec Lansing 405-8H be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 3.4 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 133.3 Hz.
What port dimensions should be used for Altec Lansing 405-8H to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 12.9 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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