Focal 8 WM
Best box: 24.0 L bass reflex tuned to 41.6 Hz · F3 62.0 Hz
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Comparable 7.9" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Focal 8 WM 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) | 24.0 Liters |
| Tuning Frequency (Fb) | 41.6 Hz |
| F3 (-3 dB Cutoff) | 62.0 Hz |
| F6 / F10 Extension | 52.8 Hz / 41.6 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 10.6 cm |
| First Pipe Resonance | 1623.0 Hz |
| Estimated MOL @ F3 | 109.0 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.9 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.273; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 30.0 Liters |
| System Q (Qtc) | 1.273 (above Butterworth: Qtc cannot fall below Qts (0.90)) |
| System Resonance (Fc) | 69.3 Hz |
| F3 (-3 dB Cutoff) | 56.7 Hz |
| F6 / F10 Extension | 48.1 Hz / 39.4 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 49.0 Hz |
| Total Q (Qts) | 0.9 |
| Electrical Q (Qes) | 1.0 |
| Mechanical Q (Qms) | 9.0 |
| Equivalent Volume (Vas) | 30.0 Liters |
| Diaphragm Area (Sd) | 216.4 cm² |
| DC Resistance (Re) | 2.7 Ω |
| Efficiency Bandwidth Product (EBP) | 49.0 |
| Linear Excursion (Xmax) | 5.5 mm |
| Thermal Power (Pe) | 100.0 W |
| Nominal Diameter | 7.9" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Focal 8 WM?
Load Forge's calculated alignment puts Focal 8 WM in a 24.0 liter vented enclosure tuned to 41.6 Hz, reaching an F3 cutoff of approximately 62.0 Hz.
Can Focal 8 WM be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 30.0 liters with a Qtc of 1.273 (above Butterworth: Qtc cannot fall below Qts (0.90)), the system exhibits an F3 of 56.7 Hz.
What port dimensions should be used for Focal 8 WM to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 10.6 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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