Beyma LOUDSPEAKER 18QLEX1600Fe 8 OH
Best box: 43.1 L bass reflex tuned to 68.6 Hz · F3 69.3 Hz
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Comparable 18.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Beyma LOUDSPEAKER 18QLEX1600Fe 8 OH 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 (43.1 L at 47.3 Hz) would need a 83.4 cm port; the recommendation is retuned to 43.1 L at 68.6 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 43.1 Liters |
| Tuning Frequency (Fb) | 68.6 Hz |
| F3 (-3 dB Cutoff) | 69.3 Hz |
| F6 / F10 Extension | 62.6 Hz / 55.4 Hz |
| Port Inner Diameter | Ø 22.8 cm |
| Port Physical Length | 44.0 cm |
| First Pipe Resonance | 391.0 Hz |
| Estimated MOL @ F3 | 126.7 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 23.1 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 89.1 Hz |
| F3 (-3 dB Cutoff) | 88.5 Hz |
| F6 / F10 Extension | 67.1 Hz / 50.7 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 30.0 Hz |
| Total Q (Qts) | 0.23 |
| Electrical Q (Qes) | 0.238 |
| Mechanical Q (Qms) | 6.5 |
| Equivalent Volume (Vas) | 195.0 Liters |
| Diaphragm Area (Sd) | 1255.0 cm² |
| DC Resistance (Re) | 5.3 Ω |
| Efficiency Bandwidth Product (EBP) | 125.8 |
| Linear Excursion (Xmax) | 13.0 mm |
| Thermal Power (Pe) | 1600.0 W |
| Nominal Diameter | 18.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Beyma LOUDSPEAKER 18QLEX1600Fe 8 OH?
Load Forge's calculated alignment puts Beyma LOUDSPEAKER 18QLEX1600Fe 8 OH in a 43.1 liter vented enclosure tuned to 68.6 Hz, reaching an F3 cutoff of approximately 69.3 Hz.
Can Beyma LOUDSPEAKER 18QLEX1600Fe 8 OH be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 23.1 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 88.5 Hz.
What port dimensions should be used for Beyma LOUDSPEAKER 18QLEX1600Fe 8 OH to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 22.8 cm with a length of 44.0 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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