Altec Lansing 920-8B
Best box: 67.9 L bass reflex tuned to 50.6 Hz · F3 49.0 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Altec Lansing 920-8B 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) | 67.9 Liters |
| Tuning Frequency (Fb) | 50.6 Hz |
| F3 (-3 dB Cutoff) | 49.0 Hz |
| F6 / F10 Extension | 43.6 Hz / 38.4 Hz |
| Port Inner Diameter | Ø 7.5 cm |
| Port Physical Length | 2.3 cm |
| First Pipe Resonance | 7628.0 Hz |
| Estimated MOL @ F3 | 111.6 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 29.7 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 88.9 Hz |
| F3 (-3 dB Cutoff) | 88.9 Hz |
| F6 / F10 Extension | 67.4 Hz / 51.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 48.0 Hz |
| Total Q (Qts) | 0.36 |
| Electrical Q (Qes) | 0.418 |
| Mechanical Q (Qms) | 2.6 |
| Equivalent Volume (Vas) | 85.0 Liters |
| Diaphragm Area (Sd) | 503.2 cm² |
| DC Resistance (Re) | 5.1 Ω |
| Efficiency Bandwidth Product (EBP) | 114.9 |
| Linear Excursion (Xmax) | 1.3 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 920-8B?
Load Forge's calculated alignment puts Altec Lansing 920-8B in a 67.9 liter vented enclosure tuned to 50.6 Hz, reaching an F3 cutoff of approximately 49.0 Hz.
Can Altec Lansing 920-8B be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 29.7 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 88.9 Hz.
What port dimensions should be used for Altec Lansing 920-8B to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 7.5 cm with a length of 2.3 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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