SEAS H0512_P21RFXP
Best box: 10.7 L bass reflex tuned to 53.6 Hz · F3 66.2 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SEAS H0512_P21RFXP 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) | 10.7 Liters |
| Tuning Frequency (Fb) | 53.6 Hz |
| F3 (-3 dB Cutoff) | 66.2 Hz |
| F6 / F10 Extension | 54.7 Hz / 46.1 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 15.6 cm |
| First Pipe Resonance | 1105.0 Hz |
| Estimated MOL @ F3 | 110.9 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 5.7 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 101.4 Hz |
| F3 (-3 dB Cutoff) | 104.6 Hz |
| F6 / F10 Extension | 79.2 Hz / 59.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 34.0 Hz |
| Total Q (Qts) | 0.23 |
| Electrical Q (Qes) | 0.266 |
| Mechanical Q (Qms) | 1.7 |
| Equivalent Volume (Vas) | 48.3 Liters |
| Diaphragm Area (Sd) | 194.0 cm² |
| DC Resistance (Re) | 6.4 Ω |
| Efficiency Bandwidth Product (EBP) | 127.8 |
| Linear Excursion (Xmax) | 4.0 mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 8.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for SEAS H0512_P21RFXP?
Load Forge's calculated alignment puts SEAS H0512_P21RFXP in a 10.7 liter vented enclosure tuned to 53.6 Hz, reaching an F3 cutoff of approximately 66.2 Hz.
Can SEAS H0512_P21RFXP be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 5.7 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 104.6 Hz.
What port dimensions should be used for SEAS H0512_P21RFXP to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 15.6 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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