SEAS W12CY004
Best box: 4.3 L bass reflex tuned to 55.4 Hz · F3 52.6 Hz
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Comparable 4.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SEAS W12CY004 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 (4.3 L at 48.2 Hz) would need a 55.3 cm port; the recommendation is retuned to 4.3 L at 55.4 Hz so the port can be built.
- Limited linear excursion (Xmax: 3.0 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 4.3 Liters |
| Tuning Frequency (Fb) | 55.4 Hz |
| F3 (-3 dB Cutoff) | 52.6 Hz |
| F6 / F10 Extension | 47.5 Hz / 42.2 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 41.0 cm |
| First Pipe Resonance | 419.0 Hz |
| Estimated MOL @ F3 | 98.9 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 1.9 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 88.4 Hz |
| F3 (-3 dB Cutoff) | 89.2 Hz |
| F6 / F10 Extension | 67.3 Hz / 50.7 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 48.0 Hz |
| Total Q (Qts) | 0.38 |
| Electrical Q (Qes) | 0.405 |
| Mechanical Q (Qms) | 6.11 |
| Equivalent Volume (Vas) | 4.6 Liters |
| Diaphragm Area (Sd) | 50.0 cm² |
| DC Resistance (Re) | 5.5 Ω |
| Efficiency Bandwidth Product (EBP) | 118.5 |
| Linear Excursion (Xmax) | 3.0 mm |
| Thermal Power (Pe) | 150.0 W |
| Nominal Diameter | 4.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for SEAS W12CY004?
Load Forge's calculated alignment puts SEAS W12CY004 in a 4.3 liter vented enclosure tuned to 55.4 Hz, reaching an F3 cutoff of approximately 52.6 Hz.
Can SEAS W12CY004 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 1.9 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 89.2 Hz.
What port dimensions should be used for SEAS W12CY004 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 41.0 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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