Monacor SP-167C-4
Best box: 22.1 L bass reflex tuned to 48.0 Hz · F3 46.7 Hz
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Comparable 6.69" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Monacor SP-167C-4 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) | 22.1 Liters |
| Tuning Frequency (Fb) | 48.0 Hz |
| F3 (-3 dB Cutoff) | 46.7 Hz |
| F6 / F10 Extension | 41.4 Hz / 36.5 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 8.0 cm |
| First Pipe Resonance | 2154.0 Hz |
| Estimated MOL @ F3 | 103.3 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 9.6 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 86.0 Hz |
| F3 (-3 dB Cutoff) | 88.6 Hz |
| F6 / F10 Extension | 67.0 Hz / 50.5 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 49.0 Hz |
| Total Q (Qts) | 0.39 |
| Electrical Q (Qes) | 0.451 |
| Mechanical Q (Qms) | 2.89 |
| Equivalent Volume (Vas) | 22.0 Liters |
| Diaphragm Area (Sd) | 137.0 cm² |
| DC Resistance (Re) | 3.7 Ω |
| Efficiency Bandwidth Product (EBP) | 108.7 |
| Linear Excursion (Xmax) | 4.0 mm |
| Thermal Power (Pe) | 50.0 W |
| Nominal Diameter | 6.69" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Monacor SP-167C-4?
Load Forge's calculated alignment puts Monacor SP-167C-4 in a 22.1 liter vented enclosure tuned to 48.0 Hz, reaching an F3 cutoff of approximately 46.7 Hz.
Can Monacor SP-167C-4 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 9.6 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 88.6 Hz.
What port dimensions should be used for Monacor SP-167C-4 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 8.0 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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