Fostex FW208HS
Best box: 17.7 L bass reflex tuned to 43.2 Hz · F3 43.6 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Fostex FW208HS 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) | 17.7 Liters |
| Tuning Frequency (Fb) | 43.2 Hz |
| F3 (-3 dB Cutoff) | 43.6 Hz |
| F6 / F10 Extension | 38.3 Hz / 33.4 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 14.2 cm |
| First Pipe Resonance | 1208.0 Hz |
| Estimated MOL @ F3 | 105.4 dB SPL |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 7.8 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 79.3 Hz |
| F3 (-3 dB Cutoff) | 80.5 Hz |
| F6 / F10 Extension | 60.8 Hz / 45.9 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 40.0 Hz |
| Total Q (Qts) | 0.35 |
| Electrical Q (Qes) | 0.376 |
| Mechanical Q (Qms) | 5.0 |
| Equivalent Volume (Vas) | 24.0 Liters |
| Diaphragm Area (Sd) | 221.0 cm² |
| DC Resistance (Re) | 8.0 Ω |
| Efficiency Bandwidth Product (EBP) | 106.3 |
| Linear Excursion (Xmax) | 5.0 mm |
| Thermal Power (Pe) | 120.0 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 Fostex FW208HS?
Load Forge's calculated alignment puts Fostex FW208HS in a 17.7 liter vented enclosure tuned to 43.2 Hz, reaching an F3 cutoff of approximately 43.6 Hz.
Can Fostex FW208HS be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 7.8 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 80.5 Hz.
What port dimensions should be used for Fostex FW208HS to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 14.2 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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