Scan-Speak 18WE/4542T00
Best box: 4.8 L bass reflex tuned to 70.7 Hz · F3 76.3 Hz
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Comparable 7.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Scan-Speak 18WE/4542T00 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 (4.8 L at 67.3 Hz) would need a 45.2 cm port; the recommendation is retuned to 4.8 L at 70.7 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 4.8 Liters |
| Tuning Frequency (Fb) | 70.7 Hz |
| F3 (-3 dB Cutoff) | 76.3 Hz |
| F6 / F10 Extension | 66.4 Hz / 57.2 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 40.5 cm |
| First Pipe Resonance | 425.0 Hz |
| Estimated MOL @ F3 | 103.1 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 2.4 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 127.3 Hz |
| F3 (-3 dB Cutoff) | 119.8 Hz |
| F6 / F10 Extension | 92.3 Hz / 70.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 46.0 Hz |
| Total Q (Qts) | 0.25 |
| Electrical Q (Qes) | 0.262 |
| Mechanical Q (Qms) | 5.62 |
| Equivalent Volume (Vas) | 17.0 Liters |
| Diaphragm Area (Sd) | 133.0 cm² |
| DC Resistance (Re) | 3.4 Ω |
| Efficiency Bandwidth Product (EBP) | 175.8 |
| Linear Excursion (Xmax) | 7.2 mm |
| Thermal Power (Pe) | 50.0 W |
| Nominal Diameter | 7.0" |
| 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 18WE/4542T00?
Load Forge's calculated alignment puts Scan-Speak 18WE/4542T00 in a 4.8 liter vented enclosure tuned to 70.7 Hz, reaching an F3 cutoff of approximately 76.3 Hz.
Can Scan-Speak 18WE/4542T00 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 2.4 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 119.8 Hz.
What port dimensions should be used for Scan-Speak 18WE/4542T00 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 40.5 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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