P.Audio SD18-1700EL
Best box: 149.6 L bass reflex tuned to 31.5 Hz · F3 34.4 Hz
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Comparable 18.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the P.Audio SD18-1700EL 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
- Large enclosure volume (149.6 L) requires extensive internal matrix bracing to prevent panel resonance.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 149.6 Liters |
| Tuning Frequency (Fb) | 31.5 Hz |
| F3 (-3 dB Cutoff) | 34.4 Hz |
| F6 / F10 Extension | 27.4 Hz / 23.7 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 8.7 cm |
| First Pipe Resonance | 1975.0 Hz |
| Estimated MOL @ F3 | 122.1 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 228.7 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 52.1 Hz |
| F3 (-3 dB Cutoff) | 48.9 Hz |
| F6 / F10 Extension | 37.0 Hz / 27.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 45.0 Hz |
| Total Q (Qts) | 0.59 |
| Electrical Q (Qes) | 0.623 |
| Mechanical Q (Qms) | 11.1 |
| Equivalent Volume (Vas) | 99.7 Liters |
| Diaphragm Area (Sd) | 1225.0 cm² |
| DC Resistance (Re) | 5.2 Ω |
| Efficiency Bandwidth Product (EBP) | 72.2 |
| Linear Excursion (Xmax) | 4.8 mm |
| Thermal Power (Pe) | 1700.0 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 P.Audio SD18-1700EL?
Load Forge's calculated alignment puts P.Audio SD18-1700EL in a 149.6 liter vented enclosure tuned to 31.5 Hz, reaching an F3 cutoff of approximately 34.4 Hz.
Can P.Audio SD18-1700EL be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 228.7 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 48.9 Hz.
What port dimensions should be used for P.Audio SD18-1700EL to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 8.7 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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