REDCATT DR-18-007-4R-B2-C0001
Best box: 43.1 L bass reflex tuned to 47.3 Hz · F3 57.2 Hz
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Comparable 18.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the REDCATT DR-18-007-4R-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
- Port length (99.4 cm) exceeds a straight internal run; use an elbow bend, slotted vent or 3D folded duct to fit the enclosure.
Recommended Bass Reflex (Vented)
PORT NEEDS ELBOW / 3D| Net Box Volume (Vb) | 43.1 Liters |
| Tuning Frequency (Fb) | 47.3 Hz |
| F3 (-3 dB Cutoff) | 57.2 Hz |
| F6 / F10 Extension | 47.9 Hz / 40.4 Hz |
| Port Inner Diameter | Ø 21.7 cm |
| Port Physical Length | 99.4 cm |
| First Pipe Resonance | 173.0 Hz |
| Estimated MOL @ F3 | 137.8 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 23.1 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 89.0 Hz |
| F3 (-3 dB Cutoff) | 89.5 Hz |
| F6 / F10 Extension | 68.3 Hz / 51.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 30.0 Hz |
| Total Q (Qts) | 0.23 |
| Electrical Q (Qes) | 0.234 |
| Mechanical Q (Qms) | 13.2 |
| Equivalent Volume (Vas) | 195.0 Liters |
| Diaphragm Area (Sd) | 1256.6 cm² |
| DC Resistance (Re) | 3.3 Ω |
| Efficiency Bandwidth Product (EBP) | 128.2 |
| Linear Excursion (Xmax) | 17.0 mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 18.0" |
| 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-18-007-4R-B2-C0001?
Load Forge's calculated alignment puts REDCATT DR-18-007-4R-B2-C0001 in a 43.1 liter vented enclosure tuned to 47.3 Hz, reaching an F3 cutoff of approximately 57.2 Hz.
Can REDCATT DR-18-007-4R-B2-C0001 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 23.1 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 89.5 Hz.
What port dimensions should be used for REDCATT DR-18-007-4R-B2-C0001 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 21.7 cm with a length of 99.4 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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