Fostex FE83A-VB
Best box: 1.5 L bass reflex tuned to 92.8 Hz · F3 110.1 Hz
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Comparable 3.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Fostex FE83A-VB 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 88.4 Hz) would need a 46.6 cm port; the recommendation is retuned to 1.5 L at 92.8 Hz so the port can be built.
- 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) | 1.5 Liters |
| Tuning Frequency (Fb) | 92.8 Hz |
| F3 (-3 dB Cutoff) | 110.1 Hz |
| F6 / F10 Extension | 89.4 Hz / 72.3 Hz |
| Port Inner Diameter ESTIMATED | Ø 5.0 cm |
| Port Physical Length | 42.0 cm |
| First Pipe Resonance | 410.0 Hz |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.63 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.891; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 0.9 Liters |
| System Q (Qtc) | 0.891 (above Butterworth) |
| System Resonance (Fc) | 147.1 Hz |
| F3 (-3 dB Cutoff) | 141.4 Hz |
| F6 / F10 Extension | 116.3 Hz / 93.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 104.0 Hz |
| Total Q (Qts) | 0.63 |
| Electrical Q (Qes) | 0.755 |
| Mechanical Q (Qms) | 3.81 |
| Equivalent Volume (Vas) | 0.9 Liters |
| Diaphragm Area (Sd) | 28.3 cm² |
| DC Resistance (Re) | 6.9 Ω |
| Efficiency Bandwidth Product (EBP) | 137.8 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 3.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Fostex FE83A-VB?
Load Forge's calculated alignment puts Fostex FE83A-VB in a 1.5 liter vented enclosure tuned to 92.8 Hz, reaching an F3 cutoff of approximately 110.1 Hz.
Can Fostex FE83A-VB be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.9 liters with a Qtc of 0.891 (above Butterworth), the system exhibits an F3 of 141.4 Hz.
What port dimensions should be used for Fostex FE83A-VB to avoid port chuffing?
Xmax is not published for Fostex FE83A-VB, so the port is an empirical estimate: a 5.0 cm diameter with a length of 42.0 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
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