JBL LE5-10
Best box: 1.9 L bass reflex tuned to 148.8 Hz · F3 215.4 Hz
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Comparable 4.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the JBL LE5-10 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 (1.5 L at 212.5 Hz) would need a 5.1 cm port; the recommendation is retuned to 1.9 L at 148.8 Hz so the port can be built.
- Limited linear excursion (Xmax: 1.52 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) | 1.9 Liters |
| Tuning Frequency (Fb) | 148.8 Hz |
| F3 (-3 dB Cutoff) | 215.4 Hz |
| F6 / F10 Extension | 130.4 Hz / 115.0 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 10.4 cm |
| First Pipe Resonance | 1651.0 Hz |
| Estimated MOL @ F3 | 105.0 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 1.0 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.414; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 0.74 Liters |
| System Q (Qtc) | 1.414 (above Butterworth: Qtc cannot fall below Qts (1.00)) |
| System Resonance (Fc) | 353.6 Hz |
| F3 (-3 dB Cutoff) | 283.1 Hz |
| F6 / F10 Extension | 243.3 Hz / 201.5 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 250.0 Hz |
| Total Q (Qts) | 1.0 |
| Electrical Q (Qes) | 1.5 |
| Mechanical Q (Qms) | 3.0 |
| Equivalent Volume (Vas) | 0.7 Liters |
| Diaphragm Area (Sd) | 62.0 cm² |
| DC Resistance (Re) | 6.0 Ω |
| Efficiency Bandwidth Product (EBP) | 166.7 |
| Linear Excursion (Xmax) | 1.5 mm |
| Thermal Power (Pe) | 25.0 W |
| Nominal Diameter | 4.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for JBL LE5-10?
Load Forge's calculated alignment puts JBL LE5-10 in a 1.9 liter vented enclosure tuned to 148.8 Hz, reaching an F3 cutoff of approximately 215.4 Hz.
Can JBL LE5-10 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.74 liters with a Qtc of 1.414 (above Butterworth: Qtc cannot fall below Qts (1.00)), the system exhibits an F3 of 283.1 Hz.
What port dimensions should be used for JBL LE5-10 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 10.4 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
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