SEAS XM011-04 L22ROY2
Best box: 28.2 L bass reflex tuned to 29.2 Hz · F3 27.5 Hz
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Comparable 8.7" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SEAS XM011-04 L22ROY2 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 (28.2 L at 26.5 Hz) would need a 50.1 cm port; the recommendation is retuned to 28.2 L at 29.2 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 28.2 Liters |
| Tuning Frequency (Fb) | 29.2 Hz |
| F3 (-3 dB Cutoff) | 27.5 Hz |
| F6 / F10 Extension | 24.8 Hz / 22.0 Hz |
| Port Inner Diameter | Ø 6.8 cm |
| Port Physical Length | 40.4 cm |
| First Pipe Resonance | 426.0 Hz |
| Estimated MOL @ F3 | 107.4 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 12.2 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 48.5 Hz |
| F3 (-3 dB Cutoff) | 51.0 Hz |
| F6 / F10 Extension | 38.0 Hz / 28.5 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 27.0 Hz |
| Total Q (Qts) | 0.39 |
| Electrical Q (Qes) | 0.424 |
| Mechanical Q (Qms) | 4.91 |
| Equivalent Volume (Vas) | 28.0 Liters |
| Diaphragm Area (Sd) | 221.0 cm² |
| DC Resistance (Re) | 3.2 Ω |
| Efficiency Bandwidth Product (EBP) | 63.7 |
| Linear Excursion (Xmax) | 11.5 mm |
| Thermal Power (Pe) | 500.0 W |
| Nominal Diameter | 8.7" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for SEAS XM011-04 L22ROY2?
Load Forge's calculated alignment puts SEAS XM011-04 L22ROY2 in a 28.2 liter vented enclosure tuned to 29.2 Hz, reaching an F3 cutoff of approximately 27.5 Hz.
Can SEAS XM011-04 L22ROY2 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 12.2 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 51.0 Hz.
What port dimensions should be used for SEAS XM011-04 L22ROY2 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 6.8 cm with a length of 40.4 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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