Scan Scan-Speak Ellipticor D8404/552000 Dome midrange
Best box: 2.2 L bass reflex tuned to 142.8 Hz · F3 255.9 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Scan Scan-Speak Ellipticor D8404/552000 Dome midrange 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 (1.5 L at 238.0 Hz) would need a 20.6 cm port; the recommendation is retuned to 2.2 L at 142.8 Hz so the port can be built.
- Port length (45.3 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) | 2.2 Liters |
| Tuning Frequency (Fb) | 142.8 Hz |
| F3 (-3 dB Cutoff) | 255.9 Hz |
| F6 / F10 Extension | 184.4 Hz / 113.6 Hz |
| Port Inner Diameter | Ø 10.0 cm |
| Port Physical Length | 45.3 cm |
| First Pipe Resonance | 379.0 Hz |
| Estimated MOL @ F3 | 113.5 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.69 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.976; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 1.0 Liters |
| System Q (Qtc) | 0.976 (above Butterworth) |
| System Resonance (Fc) | 396.0 Hz |
| F3 (-3 dB Cutoff) | 330.6 Hz |
| F6 / F10 Extension | 270.9 Hz / 215.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 280.0 Hz |
| Total Q (Qts) | 0.69 |
| Electrical Q (Qes) | 0.839 |
| Mechanical Q (Qms) | 3.89 |
| Equivalent Volume (Vas) | 1.0 Liters |
| Diaphragm Area (Sd) | 220.0 cm² |
| DC Resistance (Re) | 3.03 Ω |
| Efficiency Bandwidth Product (EBP) | 333.8 |
| Linear Excursion (Xmax) | 4.0 mm |
| Thermal Power (Pe) | 100.0 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 Scan Scan-Speak Ellipticor D8404/552000 Dome midrange?
Load Forge's calculated alignment puts Scan Scan-Speak Ellipticor D8404/552000 Dome midrange in a 2.2 liter vented enclosure tuned to 142.8 Hz, reaching an F3 cutoff of approximately 255.9 Hz.
Can Scan Scan-Speak Ellipticor D8404/552000 Dome midrange be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 1.0 liters with a Qtc of 0.976 (above Butterworth), the system exhibits an F3 of 330.6 Hz.
What port dimensions should be used for Scan Scan-Speak Ellipticor D8404/552000 Dome midrange to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 10.0 cm with a length of 45.3 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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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