ETON 4-308
Best box: 6.6 L bass reflex tuned to 56.7 Hz · F3 54.8 Hz
Open and tweak this box live ↗
Will it fit your requirements?
Check the ETON 4-308 against your space and targets — instant, no sign-up.
Free, no sign-up to simulate · a free account saves your design
Comparable 4.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the ETON 4-308 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
- Xmax is not published, so the port size is an empirical estimate (area ≥ 12 in² per ft³ of net volume, minimum by driver size), not a displacement calculation. Check air velocity in Load Forge Studio.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 6.6 Liters |
| Tuning Frequency (Fb) | 56.7 Hz |
| F3 (-3 dB Cutoff) | 54.8 Hz |
| F6 / F10 Extension | 48.7 Hz / 42.9 Hz |
| Port Inner Diameter ESTIMATED | Ø 5.0 cm |
| Port Physical Length | 24.2 cm |
| First Pipe Resonance | 712.0 Hz |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 2.9 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 102.6 Hz |
| F3 (-3 dB Cutoff) | 102.8 Hz |
| F6 / F10 Extension | 77.9 Hz / 58.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 57.9 Hz |
| Total Q (Qts) | 0.39 |
| Electrical Q (Qes) | 0.415 |
| Mechanical Q (Qms) | 6.48 |
| Equivalent Volume (Vas) | 6.6 Liters |
| Diaphragm Area (Sd) | 50.0 cm² |
| DC Resistance (Re) | 5.7 Ω |
| Efficiency Bandwidth Product (EBP) | 139.5 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | N/A 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 ETON 4-308?
Load Forge's calculated alignment puts ETON 4-308 in a 6.6 liter vented enclosure tuned to 56.7 Hz, reaching an F3 cutoff of approximately 54.8 Hz.
Can ETON 4-308 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 2.9 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 102.8 Hz.
What port dimensions should be used for ETON 4-308 to avoid port chuffing?
Xmax is not published for ETON 4-308, so the port is an empirical estimate: a 5.0 cm diameter with a length of 24.2 cm (area at least 12 in² per ft³ of net volume). Check the air velocity at your power level in 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.
Not sure if 4-308 fits your physical space?
Don't force a driver into the wrong box. Use Bass Match to calculate which of 8,000+ catalog drivers delivers the highest SPL, lowest F3, and cleanest port air velocity for your exact trunk or room dimensions.
Run Bass Match for Your Space