Volt Loudspeakers VM752
Best box: 0.16 L sealed · Fc 565.7 Hz · F3 471.7 Hz
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Comparable 4.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Volt Loudspeakers VM752 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: 1.0 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Textbook Bass Reflex — not recommended (14.0 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 1.5 Liters |
| Tuning Frequency (Fb) | 340.0 Hz |
| F3 (-3 dB Cutoff) | 313.4 Hz |
| F6 / F10 Extension | 297.5 Hz / 278.0 Hz |
| Port Inner Diameter | Ø 7.5 cm |
| Port Physical Length | 2.3 cm |
| First Pipe Resonance | 7562.0 Hz |
| Estimated MOL @ F3 | 118.7 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.75 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.061; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 0.16 Liters |
| System Q (Qtc) | 1.061 (above Butterworth: Qtc cannot fall below Qts (0.75)) |
| System Resonance (Fc) | 565.7 Hz |
| F3 (-3 dB Cutoff) | 471.7 Hz |
| F6 / F10 Extension | 391.7 Hz / 315.4 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 400.0 Hz |
| Total Q (Qts) | 0.75 |
| Electrical Q (Qes) | 0.814 |
| Mechanical Q (Qms) | 9.53 |
| Equivalent Volume (Vas) | 0.2 Liters |
| Diaphragm Area (Sd) | 57.0 cm² |
| DC Resistance (Re) | 6.3 Ω |
| Efficiency Bandwidth Product (EBP) | 491.4 |
| Linear Excursion (Xmax) | 1.0 mm |
| Thermal Power (Pe) | 100.0 W |
| Nominal Diameter | 4.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Volt Loudspeakers VM752?
A simple ported box is not recommended for Volt Loudspeakers VM752: the textbook alignment (1.5 liters tuned to 340.0 Hz) needs a 2.3 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 Volt Loudspeakers VM752 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.16 liters with a Qtc of 1.061 (above Butterworth: Qtc cannot fall below Qts (0.75)), the system exhibits an F3 of 471.7 Hz.
What port dimensions should be used for Volt Loudspeakers VM752 to avoid port chuffing?
A straight 7.5 cm port would need 2.3 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
Shareable Acoustic Card for Forums & Social Media
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