REDCATT 61FHMX8
Best box: 42.3 L bass reflex tuned to 27.9 Hz · F3 27.2 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the REDCATT 61FHMX8 does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 42.3 Liters |
| Tuning Frequency (Fb) | 27.9 Hz |
| F3 (-3 dB Cutoff) | 27.2 Hz |
| F6 / F10 Extension | 23.6 Hz / 20.9 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 14.3 cm |
| First Pipe Resonance | 1203.0 Hz |
| Estimated MOL @ F3 | 100.2 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 26.1 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 49.5 Hz |
| F3 (-3 dB Cutoff) | 48.5 Hz |
| F6 / F10 Extension | 37.1 Hz / 28.3 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 35.0 Hz |
| Total Q (Qts) | 0.49 |
| Electrical Q (Qes) | 0.513 |
| Mechanical Q (Qms) | 11.01 |
| Equivalent Volume (Vas) | 28.2 Liters |
| Diaphragm Area (Sd) | 132.7 cm² |
| DC Resistance (Re) | 5.8 Ω |
| Efficiency Bandwidth Product (EBP) | 68.2 |
| Linear Excursion (Xmax) | 6.4 mm |
| Thermal Power (Pe) | 60.0 W |
| Nominal Diameter | 6.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for REDCATT 61FHMX8?
Load Forge's calculated alignment puts REDCATT 61FHMX8 in a 42.3 liter vented enclosure tuned to 27.9 Hz, reaching an F3 cutoff of approximately 27.2 Hz.
Can REDCATT 61FHMX8 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 26.1 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 48.5 Hz.
What port dimensions should be used for REDCATT 61FHMX8 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 14.3 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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