Acr Speaker acr-15500-black-platinum
Best box: 124.1 L bass reflex tuned to 38.2 Hz · F3 52.0 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Acr Speaker acr-15500-black-platinum 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 (124.1 L) requires extensive internal matrix bracing to prevent panel resonance.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 124.1 Liters |
| Tuning Frequency (Fb) | 38.2 Hz |
| F3 (-3 dB Cutoff) | 52.0 Hz |
| F6 / F10 Extension | 42.6 Hz / 32.9 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 5.9 cm |
| First Pipe Resonance | 2940.0 Hz |
| Estimated MOL @ F3 | 117.0 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.64 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.905; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 155.1 Liters |
| System Q (Qtc) | 0.905 (above Butterworth) |
| System Resonance (Fc) | 63.6 Hz |
| F3 (-3 dB Cutoff) | 52.8 Hz |
| F6 / F10 Extension | 42.8 Hz / 33.8 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 45.0 Hz |
| Total Q (Qts) | 0.64 |
| Electrical Q (Qes) | 0.687 |
| Mechanical Q (Qms) | 9.44 |
| Equivalent Volume (Vas) | 155.1 Liters |
| Diaphragm Area (Sd) | 865.7 cm² |
| DC Resistance (Re) | 6.8 Ω |
| Efficiency Bandwidth Product (EBP) | 65.5 |
| Linear Excursion (Xmax) | 5.5 mm |
| Thermal Power (Pe) | 200.0 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 Acr Speaker acr-15500-black-platinum?
Load Forge's calculated alignment puts Acr Speaker acr-15500-black-platinum in a 124.1 liter vented enclosure tuned to 38.2 Hz, reaching an F3 cutoff of approximately 52.0 Hz.
Can Acr Speaker acr-15500-black-platinum be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 155.1 liters with a Qtc of 0.905 (above Butterworth), the system exhibits an F3 of 52.8 Hz.
What port dimensions should be used for Acr Speaker acr-15500-black-platinum to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 5.9 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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