Acr Speaker pa-18838-excel-by-acr
Best box: 361.1 L bass reflex tuned to 31.4 Hz · F3 29.6 Hz
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Comparable 18.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Acr Speaker pa-18838-excel-by-acr 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 (361.1 L) requires extensive internal matrix bracing to prevent panel resonance.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 361.1 Liters |
| Tuning Frequency (Fb) | 31.4 Hz |
| F3 (-3 dB Cutoff) | 29.6 Hz |
| F6 / F10 Extension | 26.7 Hz / 23.8 Hz |
| Port Inner Diameter | Ø 15.0 cm |
| Port Physical Length | 4.2 cm |
| First Pipe Resonance | 4142.0 Hz |
| Estimated MOL @ F3 | 120.8 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 157.1 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 54.5 Hz |
| F3 (-3 dB Cutoff) | 54.7 Hz |
| F6 / F10 Extension | 40.6 Hz / 30.4 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 32.0 Hz |
| Total Q (Qts) | 0.39 |
| Electrical Q (Qes) | 0.405 |
| Mechanical Q (Qms) | 10.5 |
| Equivalent Volume (Vas) | 359.1 Liters |
| Diaphragm Area (Sd) | 1269.2 cm² |
| DC Resistance (Re) | 5.6 Ω |
| Efficiency Bandwidth Product (EBP) | 79.0 |
| Linear Excursion (Xmax) | 7.9 mm |
| Thermal Power (Pe) | 650.0 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 Acr Speaker pa-18838-excel-by-acr?
Load Forge's calculated alignment puts Acr Speaker pa-18838-excel-by-acr in a 361.1 liter vented enclosure tuned to 31.4 Hz, reaching an F3 cutoff of approximately 29.6 Hz.
Can Acr Speaker pa-18838-excel-by-acr be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 157.1 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 54.7 Hz.
What port dimensions should be used for Acr Speaker pa-18838-excel-by-acr to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 15.0 cm with a length of 4.2 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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