REDCATT 20NFR
Best box: 0.11 L sealed · Fc 249.8 Hz · F3 254.4 Hz
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Comparable 2.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the REDCATT 20NFR 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: 3.0 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Textbook Bass Reflex — not recommended (5.2 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 1.5 Liters |
| Tuning Frequency (Fb) | 140.0 Hz |
| F3 (-3 dB Cutoff) | 131.0 Hz |
| F6 / F10 Extension | 125.4 Hz / 118.1 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 16.4 cm |
| First Pipe Resonance | 1046.0 Hz |
| Estimated MOL @ F3 | 99.1 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 0.11 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 249.8 Hz |
| F3 (-3 dB Cutoff) | 254.4 Hz |
| F6 / F10 Extension | 193.3 Hz / 146.5 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 185.0 Hz |
| Total Q (Qts) | 0.52 |
| Electrical Q (Qes) | 0.548 |
| Mechanical Q (Qms) | 10.3 |
| Equivalent Volume (Vas) | 0.1 Liters |
| Diaphragm Area (Sd) | 11.3 cm² |
| DC Resistance (Re) | 3.6 Ω |
| Efficiency Bandwidth Product (EBP) | 337.8 |
| Linear Excursion (Xmax) | 3.0 mm |
| Thermal Power (Pe) | 20.0 W |
| Nominal Diameter | 2.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for REDCATT 20NFR?
A simple ported box is not recommended for REDCATT 20NFR: the textbook alignment (1.5 liters tuned to 140.0 Hz) needs a 16.4 cm port, and no nearby retune stays buildable without a bass hump. A sealed box, a passive radiator or a folded duct is the practical choice.
Can REDCATT 20NFR be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.11 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 254.4 Hz.
What port dimensions should be used for REDCATT 20NFR to avoid port chuffing?
A straight 5.0 cm port would need 16.4 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
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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