Acr Speaker 30h120srw38b-mk1-acr-pro
Best box: 366.8 L bass reflex tuned to 21.6 Hz · F3 21.7 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Acr Speaker 30h120srw38b-mk1-acr-pro 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 (366.8 L) requires extensive internal matrix bracing to prevent panel resonance.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 366.8 Liters |
| Tuning Frequency (Fb) | 21.6 Hz |
| F3 (-3 dB Cutoff) | 21.7 Hz |
| F6 / F10 Extension | 18.4 Hz / 16.2 Hz |
| Port Inner Diameter | Ø 7.5 cm |
| Port Physical Length | 2.4 cm |
| First Pipe Resonance | 7240.0 Hz |
| Estimated MOL @ F3 | 107.4 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 313.7 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 36.5 Hz |
| F3 (-3 dB Cutoff) | 37.0 Hz |
| F6 / F10 Extension | 27.8 Hz / 20.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 29.0 Hz |
| Total Q (Qts) | 0.53 |
| Electrical Q (Qes) | 0.601 |
| Mechanical Q (Qms) | 4.48 |
| Equivalent Volume (Vas) | 244.5 Liters |
| Diaphragm Area (Sd) | 514.7 cm² |
| DC Resistance (Re) | 7.2 Ω |
| Efficiency Bandwidth Product (EBP) | 48.2 |
| Linear Excursion (Xmax) | 6.0 mm |
| Thermal Power (Pe) | 80.0 W |
| Nominal Diameter | 12.0" |
| 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 30h120srw38b-mk1-acr-pro?
Load Forge's calculated alignment puts Acr Speaker 30h120srw38b-mk1-acr-pro in a 366.8 liter vented enclosure tuned to 21.6 Hz, reaching an F3 cutoff of approximately 21.7 Hz.
Can Acr Speaker 30h120srw38b-mk1-acr-pro be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 313.7 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 37.0 Hz.
What port dimensions should be used for Acr Speaker 30h120srw38b-mk1-acr-pro to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 7.5 cm with a length of 2.4 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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