Monacor SP-382PA
Best box: 216.0 L bass reflex tuned to 21.2 Hz · F3 40.6 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Monacor SP-382PA 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 (216.0 L) requires extensive internal matrix bracing to prevent panel resonance.
- Limited linear excursion (Xmax: 3.5 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 216.0 Liters |
| Tuning Frequency (Fb) | 21.2 Hz |
| F3 (-3 dB Cutoff) | 40.6 Hz |
| F6 / F10 Extension | 33.7 Hz / 26.2 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 6.4 cm |
| First Pipe Resonance | 2708.0 Hz |
| Estimated MOL @ F3 | 107.7 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.75 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.061; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 270.0 Liters |
| System Q (Qtc) | 1.061 (above Butterworth: Qtc cannot fall below Qts (0.75)) |
| System Resonance (Fc) | 35.4 Hz |
| F3 (-3 dB Cutoff) | 39.0 Hz |
| F6 / F10 Extension | 32.4 Hz / 26.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 25.0 Hz |
| Total Q (Qts) | 0.75 |
| Electrical Q (Qes) | 0.997 |
| Mechanical Q (Qms) | 3.03 |
| Equivalent Volume (Vas) | 270.0 Liters |
| Diaphragm Area (Sd) | 825.0 cm² |
| DC Resistance (Re) | 7.0 Ω |
| Efficiency Bandwidth Product (EBP) | 25.1 |
| Linear Excursion (Xmax) | 3.5 mm |
| Thermal Power (Pe) | 150.0 W |
| Nominal Diameter | 15.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Monacor SP-382PA?
Load Forge's calculated alignment puts Monacor SP-382PA in a 216.0 liter vented enclosure tuned to 21.2 Hz, reaching an F3 cutoff of approximately 40.6 Hz.
Can Monacor SP-382PA be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 270.0 liters with a Qtc of 1.061 (above Butterworth: Qtc cannot fall below Qts (0.75)), the system exhibits an F3 of 39.0 Hz.
What port dimensions should be used for Monacor SP-382PA to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 6.4 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
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