REDCATT DR-5-003-8R-B2-C0001
Best box: 1.7 L bass reflex tuned to 85.9 Hz · F3 84.5 Hz
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Comparable 4.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the REDCATT DR-5-003-8R-B2-C0001 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
- The textbook alignment (1.7 L at 68.7 Hz) would need a 69.8 cm port; the recommendation is retuned to 1.7 L at 85.9 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 1.7 Liters |
| Tuning Frequency (Fb) | 85.9 Hz |
| F3 (-3 dB Cutoff) | 84.5 Hz |
| F6 / F10 Extension | 75.9 Hz / 66.9 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 43.3 cm |
| First Pipe Resonance | 397.0 Hz |
| Estimated MOL @ F3 | 112.4 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 0.78 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 128.5 Hz |
| F3 (-3 dB Cutoff) | 128.3 Hz |
| F6 / F10 Extension | 98.4 Hz / 74.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 57.0 Hz |
| Total Q (Qts) | 0.31 |
| Electrical Q (Qes) | 0.337 |
| Mechanical Q (Qms) | 3.9 |
| Equivalent Volume (Vas) | 3.3 Liters |
| Diaphragm Area (Sd) | 52.8 cm² |
| DC Resistance (Re) | 6.9 Ω |
| Efficiency Bandwidth Product (EBP) | 169.3 |
| Linear Excursion (Xmax) | 4.2 mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 4.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for REDCATT DR-5-003-8R-B2-C0001?
Load Forge's calculated alignment puts REDCATT DR-5-003-8R-B2-C0001 in a 1.7 liter vented enclosure tuned to 85.9 Hz, reaching an F3 cutoff of approximately 84.5 Hz.
Can REDCATT DR-5-003-8R-B2-C0001 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.78 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 128.3 Hz.
What port dimensions should be used for REDCATT DR-5-003-8R-B2-C0001 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 43.3 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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