Precision Devices PD.188/2.8
Best box: 63.4 L bass reflex tuned to 51.1 Hz · F3 55.9 Hz
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Comparable 18.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Precision Devices PD.188/2.8 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) | 63.4 Liters |
| Tuning Frequency (Fb) | 51.1 Hz |
| F3 (-3 dB Cutoff) | 55.9 Hz |
| F6 / F10 Extension | 48.3 Hz / 41.5 Hz |
| Port Inner Diameter | Ø 15.0 cm |
| Port Physical Length | 21.3 cm |
| First Pipe Resonance | 809.0 Hz |
| Estimated MOL @ F3 | 121.2 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 31.5 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 93.4 Hz |
| F3 (-3 dB Cutoff) | 92.7 Hz |
| F6 / F10 Extension | 70.4 Hz / 53.3 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 36.2 Hz |
| Total Q (Qts) | 0.26 |
| Electrical Q (Qes) | 0.265 |
| Mechanical Q (Qms) | 13.04 |
| Equivalent Volume (Vas) | 201.7 Liters |
| Diaphragm Area (Sd) | 1134.1 cm² |
| DC Resistance (Re) | 5.86 Ω |
| Efficiency Bandwidth Product (EBP) | 136.5 |
| Linear Excursion (Xmax) | 6.0 mm |
| Thermal Power (Pe) | 600.0 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 Precision Devices PD.188/2.8?
Load Forge's calculated alignment puts Precision Devices PD.188/2.8 in a 63.4 liter vented enclosure tuned to 51.1 Hz, reaching an F3 cutoff of approximately 55.9 Hz.
Can Precision Devices PD.188/2.8 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 31.5 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 92.7 Hz.
What port dimensions should be used for Precision Devices PD.188/2.8 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 15.0 cm with a length of 21.3 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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