Acr Speaker 3MN0445-00 (5in CURVE 538) Rev-1
Best box: 5.1 L bass reflex tuned to 62.9 Hz · F3 92.2 Hz
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Comparable 5.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Acr Speaker 3MN0445-00 (5in CURVE 538) Rev-1 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
- Limited linear excursion (Xmax: 1.7 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) | 5.1 Liters |
| Tuning Frequency (Fb) | 62.9 Hz |
| F3 (-3 dB Cutoff) | 92.2 Hz |
| F6 / F10 Extension | 77.5 Hz / 60.2 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 25.6 cm |
| First Pipe Resonance | 672.0 Hz |
| Estimated MOL @ F3 | 98.5 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) | 6.4 Liters |
| System Q (Qtc) | 1.061 (above Butterworth: Qtc cannot fall below Qts (0.75)) |
| System Resonance (Fc) | 104.7 Hz |
| F3 (-3 dB Cutoff) | 86.4 Hz |
| F6 / F10 Extension | 72.3 Hz / 58.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 74.0 Hz |
| Total Q (Qts) | 0.75 |
| Electrical Q (Qes) | 0.914 |
| Mechanical Q (Qms) | 4.19 |
| Equivalent Volume (Vas) | 6.4 Liters |
| Diaphragm Area (Sd) | 85.0 cm² |
| DC Resistance (Re) | 5.6 Ω |
| Efficiency Bandwidth Product (EBP) | 81.0 |
| Linear Excursion (Xmax) | 1.7 mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 5.0" |
| 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 3MN0445-00 (5in CURVE 538) Rev-1?
Load Forge's calculated alignment puts Acr Speaker 3MN0445-00 (5in CURVE 538) Rev-1 in a 5.1 liter vented enclosure tuned to 62.9 Hz, reaching an F3 cutoff of approximately 92.2 Hz.
Can Acr Speaker 3MN0445-00 (5in CURVE 538) Rev-1 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 6.4 liters with a Qtc of 1.061 (above Butterworth: Qtc cannot fall below Qts (0.75)), the system exhibits an F3 of 86.4 Hz.
What port dimensions should be used for Acr Speaker 3MN0445-00 (5in CURVE 538) Rev-1 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 25.6 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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Not sure if 3MN0445-00 (5in CURVE 538) Rev-1 fits your physical space?
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