JL Audio 13TW5v2-4
Best box: 90.5 L bass reflex tuned to 22.8 Hz · F3 22.2 Hz
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Comparable 13.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the JL Audio 13TW5v2-4 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
- The textbook alignment (90.5 L at 20.7 Hz) would need a 53.6 cm port; the recommendation is retuned to 90.5 L at 22.8 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 90.5 Liters |
| Tuning Frequency (Fb) | 22.8 Hz |
| F3 (-3 dB Cutoff) | 22.2 Hz |
| F6 / F10 Extension | 19.3 Hz / 17.0 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 42.9 cm |
| First Pipe Resonance | 401.0 Hz |
| Estimated MOL @ F3 | 118.8 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 74.8 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 36.6 Hz |
| F3 (-3 dB Cutoff) | 37.4 Hz |
| F6 / F10 Extension | 28.2 Hz / 21.3 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 27.6 Hz |
| Total Q (Qts) | 0.526 |
| Electrical Q (Qes) | 0.553 |
| Mechanical Q (Qms) | 10.69 |
| Equivalent Volume (Vas) | 60.3 Liters |
| Diaphragm Area (Sd) | 633.9 cm² |
| DC Resistance (Re) | 3.51 Ω |
| Efficiency Bandwidth Product (EBP) | 49.9 |
| Linear Excursion (Xmax) | 11.0 mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 13.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for JL Audio 13TW5v2-4?
Load Forge's calculated alignment puts JL Audio 13TW5v2-4 in a 90.5 liter vented enclosure tuned to 22.8 Hz, reaching an F3 cutoff of approximately 22.2 Hz.
Can JL Audio 13TW5v2-4 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 74.8 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 37.4 Hz.
What port dimensions should be used for JL Audio 13TW5v2-4 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 42.9 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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