JBL 2145A
Best box: 233.6 L bass reflex tuned to 23.1 Hz · F3 22.5 Hz
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Comparable 11.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the JBL 2145A 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
- Large enclosure volume (233.6 L) requires extensive internal matrix bracing to prevent panel resonance.
- Limited linear excursion (Xmax: 3.56 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) | 233.6 Liters |
| Tuning Frequency (Fb) | 23.1 Hz |
| F3 (-3 dB Cutoff) | 22.5 Hz |
| F6 / F10 Extension | 19.5 Hz / 17.3 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 3.9 cm |
| First Pipe Resonance | 4443.0 Hz |
| Estimated MOL @ F3 | 104.3 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 169.0 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 39.8 Hz |
| F3 (-3 dB Cutoff) | 40.6 Hz |
| F6 / F10 Extension | 30.4 Hz / 22.8 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 30.0 Hz |
| Total Q (Qts) | 0.51 |
| Electrical Q (Qes) | 0.533 |
| Mechanical Q (Qms) | 12.0 |
| Equivalent Volume (Vas) | 155.7 Liters |
| Diaphragm Area (Sd) | 438.0 cm² |
| DC Resistance (Re) | 5.0 Ω |
| Efficiency Bandwidth Product (EBP) | 56.3 |
| Linear Excursion (Xmax) | 3.6 mm |
| Thermal Power (Pe) | 50.0 W |
| Nominal Diameter | 11.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for JBL 2145A?
Load Forge's calculated alignment puts JBL 2145A in a 233.6 liter vented enclosure tuned to 23.1 Hz, reaching an F3 cutoff of approximately 22.5 Hz.
Can JBL 2145A be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 169.0 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 40.6 Hz.
What port dimensions should be used for JBL 2145A to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 3.9 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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