LaVoce CSF051.20
Best box: 0.002 L sealed · Fc 151.3 Hz · F3 131.5 Hz
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Comparable 0.75" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the LaVoce CSF051.20 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
- 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 (9.5 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 1.5 Liters |
| Tuning Frequency (Fb) | 91.0 Hz |
| F3 (-3 dB Cutoff) | 86.5 Hz |
| F6 / F10 Extension | 83.5 Hz / 79.4 Hz |
| Port Inner Diameter ESTIMATED | Ø 5.0 cm |
| Port Physical Length | 43.8 cm |
| First Pipe Resonance | 393.0 Hz |
| Estimated MOL @ F3 | 83.5 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.67 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.948; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 0.002 Liters |
| System Q (Qtc) | 0.948 (above Butterworth) |
| System Resonance (Fc) | 151.3 Hz |
| F3 (-3 dB Cutoff) | 131.5 Hz |
| F6 / F10 Extension | 107.4 Hz / 85.4 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 107.0 Hz |
| Total Q (Qts) | 0.67 |
| Electrical Q (Qes) | 0.704 |
| Mechanical Q (Qms) | 13.7 |
| Equivalent Volume (Vas) | 0.0 Liters |
| Diaphragm Area (Sd) | 2.0 cm² |
| DC Resistance (Re) | 3.1 Ω |
| Efficiency Bandwidth Product (EBP) | 151.9 |
| 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 CSF051.20?
A simple ported box is not recommended for LaVoce CSF051.20: the textbook alignment (1.5 liters tuned to 91.0 Hz) needs a 43.8 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 CSF051.20 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.002 liters with a Qtc of 0.948 (above Butterworth), the system exhibits an F3 of 131.5 Hz.
What port dimensions should be used for LaVoce CSF051.20 to avoid port chuffing?
A straight 5.0 cm port would need 43.8 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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