ATC SB75-234SC
Best box: 29.6 L bass reflex tuned to 37.5 Hz · F3 39.1 Hz
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Comparable 9.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the ATC SB75-234SC 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) | 29.6 Liters |
| Tuning Frequency (Fb) | 37.5 Hz |
| F3 (-3 dB Cutoff) | 39.1 Hz |
| F6 / F10 Extension | 34.1 Hz / 29.6 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 21.3 cm |
| First Pipe Resonance | 808.0 Hz |
| Estimated MOL @ F3 | 110.2 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 13.4 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 69.1 Hz |
| F3 (-3 dB Cutoff) | 70.7 Hz |
| F6 / F10 Extension | 53.2 Hz / 40.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 32.0 Hz |
| Total Q (Qts) | 0.32 |
| Electrical Q (Qes) | 0.343 |
| Mechanical Q (Qms) | 4.8 |
| Equivalent Volume (Vas) | 52.0 Liters |
| Diaphragm Area (Sd) | 260.0 cm² |
| DC Resistance (Re) | 6.2 Ω |
| Efficiency Bandwidth Product (EBP) | 93.3 |
| Linear Excursion (Xmax) | 8.5 mm |
| Thermal Power (Pe) | 300.0 W |
| Nominal Diameter | 9.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for ATC SB75-234SC?
Load Forge's calculated alignment puts ATC SB75-234SC in a 29.6 liter vented enclosure tuned to 37.5 Hz, reaching an F3 cutoff of approximately 39.1 Hz.
Can ATC SB75-234SC be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 13.4 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 70.7 Hz.
What port dimensions should be used for ATC SB75-234SC to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 21.3 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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