Visaton FR 6,5" - 8 Ohm
Best box: 12.8 L bass reflex tuned to 63.8 Hz · F3 105.5 Hz
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Comparable 6.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Visaton FR 6,5" - 8 Ohm 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
- Limited linear excursion (Xmax: 3.0 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 12.8 Liters |
| Tuning Frequency (Fb) | 63.8 Hz |
| F3 (-3 dB Cutoff) | 105.5 Hz |
| F6 / F10 Extension | 96.0 Hz / 83.3 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 7.7 cm |
| First Pipe Resonance | 2228.0 Hz |
| Estimated MOL @ F3 | 108.0 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 1.96 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 2.772; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 16.0 Liters |
| System Q (Qtc) | 2.772 (above Butterworth: Qtc cannot fall below Qts (1.96)) |
| System Resonance (Fc) | 106.1 Hz |
| F3 (-3 dB Cutoff) | 89.9 Hz |
| F6 / F10 Extension | 81.6 Hz / 71.4 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 75.0 Hz |
| Total Q (Qts) | 1.96 |
| Electrical Q (Qes) | 3.249 |
| Mechanical Q (Qms) | 4.94 |
| Equivalent Volume (Vas) | 16.0 Liters |
| Diaphragm Area (Sd) | 129.0 cm² |
| DC Resistance (Re) | 6.8 Ω |
| Efficiency Bandwidth Product (EBP) | 23.1 |
| Linear Excursion (Xmax) | 3.0 mm |
| Thermal Power (Pe) | 40.0 W |
| Nominal Diameter | 6.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Visaton FR 6,5" - 8 Ohm?
Load Forge's calculated alignment puts Visaton FR 6,5" - 8 Ohm in a 12.8 liter vented enclosure tuned to 63.8 Hz, reaching an F3 cutoff of approximately 105.5 Hz.
Can Visaton FR 6,5" - 8 Ohm be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 16.0 liters with a Qtc of 2.772 (above Butterworth: Qtc cannot fall below Qts (1.96)), the system exhibits an F3 of 89.9 Hz.
What port dimensions should be used for Visaton FR 6,5" - 8 Ohm to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 7.7 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
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Not sure if FR 6,5" - 8 Ohm fits your physical space?
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