Kartesian Sub185_vKi
Best box: 44.8 L bass reflex tuned to 28.4 Hz · F3 26.3 Hz
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Comparable 7.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Kartesian Sub185_vKi 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 (44.8 L at 27.0 Hz) would need a 103.7 cm port; the recommendation is retuned to 44.8 L at 28.4 Hz so the port can be built.
- Xmax is not published, so the port size is an empirical estimate (area ≥ 12 in² per ft³ of net volume, minimum by driver size), not a displacement calculation. Check air velocity in Load Forge Studio.
- Port length (92.9 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) | 44.8 Liters |
| Tuning Frequency (Fb) | 28.4 Hz |
| F3 (-3 dB Cutoff) | 26.3 Hz |
| F6 / F10 Extension | 23.9 Hz / 21.3 Hz |
| Port Inner Diameter ESTIMATED | Ø 12.5 cm |
| Port Physical Length | 92.9 cm |
| First Pipe Resonance | 185.0 Hz |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 19.6 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 48.9 Hz |
| F3 (-3 dB Cutoff) | 50.1 Hz |
| F6 / F10 Extension | 37.1 Hz / 27.7 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 28.8 Hz |
| Total Q (Qts) | 0.41 |
| Electrical Q (Qes) | 0.46 |
| Mechanical Q (Qms) | 3.8 |
| Equivalent Volume (Vas) | 38.6 Liters |
| Diaphragm Area (Sd) | 179.0 cm² |
| DC Resistance (Re) | 3.2 Ω |
| Efficiency Bandwidth Product (EBP) | 62.7 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 7.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Kartesian Sub185_vKi?
Load Forge's calculated alignment puts Kartesian Sub185_vKi in a 44.8 liter vented enclosure tuned to 28.4 Hz, reaching an F3 cutoff of approximately 26.3 Hz.
Can Kartesian Sub185_vKi be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 19.6 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 50.1 Hz.
What port dimensions should be used for Kartesian Sub185_vKi to avoid port chuffing?
Xmax is not published for Kartesian Sub185_vKi, so the port is an empirical estimate: a 12.5 cm diameter with a length of 92.9 cm (area at least 12 in² per ft³ of net volume). Check the air velocity at your power level in Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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