VAS Audio VAS-18-1700NC
Best box: 69.2 L bass reflex tuned to 48.6 Hz · F3 48.9 Hz
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Comparable 18.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the VAS Audio VAS-18-1700NC 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 (69.2 L at 42.3 Hz) would need a 61.8 cm port; the recommendation is retuned to 69.2 L at 48.6 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 69.2 Liters |
| Tuning Frequency (Fb) | 48.6 Hz |
| F3 (-3 dB Cutoff) | 48.9 Hz |
| F6 / F10 Extension | 43.6 Hz / 38.2 Hz |
| Port Inner Diameter | Ø 20.0 cm |
| Port Physical Length | 43.3 cm |
| First Pipe Resonance | 397.0 Hz |
| Estimated MOL @ F3 | 124.3 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 33.1 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 77.9 Hz |
| F3 (-3 dB Cutoff) | 79.4 Hz |
| F6 / F10 Extension | 59.9 Hz / 45.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 32.0 Hz |
| Total Q (Qts) | 0.28 |
| Electrical Q (Qes) | 0.286 |
| Mechanical Q (Qms) | 13.6 |
| Equivalent Volume (Vas) | 178.0 Liters |
| Diaphragm Area (Sd) | 1225.0 cm² |
| DC Resistance (Re) | 5.4 Ω |
| Efficiency Bandwidth Product (EBP) | 111.9 |
| Linear Excursion (Xmax) | 13.5 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 VAS Audio VAS-18-1700NC?
Load Forge's calculated alignment puts VAS Audio VAS-18-1700NC in a 69.2 liter vented enclosure tuned to 48.6 Hz, reaching an F3 cutoff of approximately 48.9 Hz.
Can VAS Audio VAS-18-1700NC be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 33.1 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 79.4 Hz.
What port dimensions should be used for VAS Audio VAS-18-1700NC to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 20.0 cm with a length of 43.3 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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