Altec Lansing ER-15L
Best box: 61.5 L bass reflex tuned to 65.2 Hz · F3 69.0 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Altec Lansing ER-15L 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: 3.302 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) | 61.5 Liters |
| Tuning Frequency (Fb) | 65.2 Hz |
| F3 (-3 dB Cutoff) | 69.0 Hz |
| F6 / F10 Extension | 60.6 Hz / 52.5 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 5.1 cm |
| First Pipe Resonance | 3351.0 Hz |
| Estimated MOL @ F3 | 125.0 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 32.1 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 111.4 Hz |
| F3 (-3 dB Cutoff) | 108.8 Hz |
| F6 / F10 Extension | 83.0 Hz / 62.8 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 43.0 Hz |
| Total Q (Qts) | 0.24 |
| Electrical Q (Qes) | 0.252 |
| Mechanical Q (Qms) | 4.96 |
| Equivalent Volume (Vas) | 246.4 Liters |
| Diaphragm Area (Sd) | 501.2 cm² |
| DC Resistance (Re) | 5.2 Ω |
| Efficiency Bandwidth Product (EBP) | 170.5 |
| Linear Excursion (Xmax) | 3.3 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 ER-15L?
Load Forge's calculated alignment puts Altec Lansing ER-15L in a 61.5 liter vented enclosure tuned to 65.2 Hz, reaching an F3 cutoff of approximately 69.0 Hz.
Can Altec Lansing ER-15L be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 32.1 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 108.8 Hz.
What port dimensions should be used for Altec Lansing ER-15L to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 cm with a length of 5.1 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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