P.Audio C18-1000 v3
Best box: 94.0 L bass reflex tuned to 34.9 Hz · F3 48.9 Hz
Open and tweak this box live ↗
Will it fit your requirements?
Check the P.Audio C18-1000 v3 against your space and targets — instant, no sign-up.
Estimated retail 7800.00 INR · Check price & availability ↗
Free, no sign-up to simulate · a free account saves your design
Comparable 18.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the P.Audio C18-1000 v3 does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 94.0 Liters |
| Tuning Frequency (Fb) | 34.9 Hz |
| F3 (-3 dB Cutoff) | 48.9 Hz |
| F6 / F10 Extension | 40.7 Hz / 31.5 Hz |
| Port Inner Diameter | Ø 12.5 cm |
| Port Physical Length | 23.2 cm |
| First Pipe Resonance | 742.0 Hz |
| Estimated MOL @ F3 | 121.2 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.72 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.018; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 117.6 Liters |
| System Q (Qtc) | 1.018 (above Butterworth: Qtc cannot fall below Qts (0.72)) |
| System Resonance (Fc) | 58.0 Hz |
| F3 (-3 dB Cutoff) | 47.1 Hz |
| F6 / F10 Extension | 38.9 Hz / 31.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 41.0 Hz |
| Total Q (Qts) | 0.72 |
| Electrical Q (Qes) | 0.77 |
| Mechanical Q (Qms) | 11.02 |
| Equivalent Volume (Vas) | 117.6 Liters |
| Diaphragm Area (Sd) | 1225.0 cm² |
| DC Resistance (Re) | 5.8 Ω |
| Efficiency Bandwidth Product (EBP) | 53.2 |
| Linear Excursion (Xmax) | 5.2 mm |
| Thermal Power (Pe) | 1200.0 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 C18-1000 v3?
Load Forge's calculated alignment puts P.Audio C18-1000 v3 in a 94.0 liter vented enclosure tuned to 34.9 Hz, reaching an F3 cutoff of approximately 48.9 Hz.
Can P.Audio C18-1000 v3 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 117.6 liters with a Qtc of 1.018 (above Butterworth: Qtc cannot fall below Qts (0.72)), the system exhibits an F3 of 47.1 Hz.
What port dimensions should be used for P.Audio C18-1000 v3 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 12.5 cm with a length of 23.2 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.
Not sure if C18-1000 v3 fits your physical space?
Don't force a driver into the wrong box. Use Bass Match to calculate which of 8,000+ catalog drivers delivers the highest SPL, lowest F3, and cleanest port air velocity for your exact trunk or room dimensions.
Run Bass Match for Your Space