LaVoce CSF061.20
Best box: 0.001 L sealed · Fc 141.4 Hz · F3 119.9 Hz
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Comparable 0.75" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the LaVoce CSF061.20 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 85.0 Hz) would need a 50.7 cm port; the recommendation is retuned to 1.5 L at 93.5 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.
Textbook Bass Reflex — not recommended (10.2 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 1.5 Liters |
| Tuning Frequency (Fb) | 93.5 Hz |
| F3 (-3 dB Cutoff) | 88.9 Hz |
| F6 / F10 Extension | 85.8 Hz / 81.5 Hz |
| Port Inner Diameter ESTIMATED | Ø 5.0 cm |
| Port Physical Length | 41.3 cm |
| First Pipe Resonance | 416.0 Hz |
| Estimated MOL @ F3 | 82.5 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.79 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.117; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 0.001 Liters |
| System Q (Qtc) | 1.117 (above Butterworth: Qtc cannot fall below Qts (0.79)) |
| System Resonance (Fc) | 141.4 Hz |
| F3 (-3 dB Cutoff) | 119.9 Hz |
| F6 / F10 Extension | 100.3 Hz / 81.2 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 100.0 Hz |
| Total Q (Qts) | 0.79 |
| Electrical Q (Qes) | 0.858 |
| Mechanical Q (Qms) | 10.0 |
| Equivalent Volume (Vas) | 0.0 Liters |
| Diaphragm Area (Sd) | 2.0 cm² |
| DC Resistance (Re) | 3.1 Ω |
| Efficiency Bandwidth Product (EBP) | 116.6 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | 50.0 W |
| Nominal Diameter | 0.75" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for LaVoce CSF061.20?
A simple ported box is not recommended for LaVoce CSF061.20: the textbook alignment (1.5 liters tuned to 93.5 Hz) needs a 41.3 cm port, and no nearby retune stays buildable without a bass hump. A sealed box, a passive radiator or a folded duct is the practical choice.
Can LaVoce CSF061.20 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.001 liters with a Qtc of 1.117 (above Butterworth: Qtc cannot fall below Qts (0.79)), the system exhibits an F3 of 119.9 Hz.
What port dimensions should be used for LaVoce CSF061.20 to avoid port chuffing?
A straight 5.0 cm port would need 41.3 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
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