Scan-Speak Illuminator 18WU/4741T00
Best box: 8.6 L bass reflex tuned to 50.7 Hz · F3 51.2 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Scan-Speak Illuminator 18WU/4741T00 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 (8.6 L at 46.1 Hz) would need a 54.7 cm port; the recommendation is retuned to 8.6 L at 50.7 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 8.6 Liters |
| Tuning Frequency (Fb) | 50.7 Hz |
| F3 (-3 dB Cutoff) | 51.2 Hz |
| F6 / F10 Extension | 45.4 Hz / 39.7 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 44.4 cm |
| First Pipe Resonance | 388.0 Hz |
| Estimated MOL @ F3 | 104.4 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 4.0 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 86.4 Hz |
| F3 (-3 dB Cutoff) | 87.2 Hz |
| F6 / F10 Extension | 66.0 Hz / 49.8 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 36.0 Hz |
| Total Q (Qts) | 0.29 |
| Electrical Q (Qes) | 0.315 |
| Mechanical Q (Qms) | 3.6 |
| Equivalent Volume (Vas) | 20.0 Liters |
| Diaphragm Area (Sd) | 135.0 cm² |
| DC Resistance (Re) | 6.0 Ω |
| Efficiency Bandwidth Product (EBP) | 114.1 |
| Linear Excursion (Xmax) | 9.0 mm |
| Thermal Power (Pe) | 130.0 W |
| Nominal Diameter | 6.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Scan-Speak Illuminator 18WU/4741T00?
Load Forge's calculated alignment puts Scan-Speak Illuminator 18WU/4741T00 in a 8.6 liter vented enclosure tuned to 50.7 Hz, reaching an F3 cutoff of approximately 51.2 Hz.
Can Scan-Speak Illuminator 18WU/4741T00 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 4.0 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 87.2 Hz.
What port dimensions should be used for Scan-Speak Illuminator 18WU/4741T00 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 44.4 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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