Sundown Audio SW-EV415D4
Best box: 112.6 L bass reflex tuned to 30.1 Hz · F3 35.0 Hz
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Comparable 15.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Sundown Audio SW-EV415D4 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 (112.6 L at 26.2 Hz) would need a 57.8 cm port; the recommendation is retuned to 112.6 L at 30.1 Hz so the port can be built.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 112.6 Liters |
| Tuning Frequency (Fb) | 30.1 Hz |
| F3 (-3 dB Cutoff) | 35.0 Hz |
| F6 / F10 Extension | 28.8 Hz / 23.8 Hz |
| Port Inner Diameter | Ø 15.0 cm |
| Port Physical Length | 41.2 cm |
| First Pipe Resonance | 417.0 Hz |
| Estimated MOL @ F3 | 117.7 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 64.2 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 46.0 Hz |
| F3 (-3 dB Cutoff) | 50.8 Hz |
| F6 / F10 Extension | 40.3 Hz / 31.4 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 32.2 Hz |
| Total Q (Qts) | 0.48 |
| Electrical Q (Qes) | 0.533 |
| Mechanical Q (Qms) | 4.79 |
| Equivalent Volume (Vas) | 75.1 Liters |
| Diaphragm Area (Sd) | 1141.9 cm² |
| DC Resistance (Re) | 4.0 Ω |
| Efficiency Bandwidth Product (EBP) | 60.4 |
| Linear Excursion (Xmax) | 14.0 mm |
| Thermal Power (Pe) | 750.0 W |
| Nominal Diameter | 15.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Sundown Audio SW-EV415D4?
Load Forge's calculated alignment puts Sundown Audio SW-EV415D4 in a 112.6 liter vented enclosure tuned to 30.1 Hz, reaching an F3 cutoff of approximately 35.0 Hz.
Can Sundown Audio SW-EV415D4 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 64.2 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 50.8 Hz.
What port dimensions should be used for Sundown Audio SW-EV415D4 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 15.0 cm with a length of 41.2 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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