Dayton Audio ND140-4 Bass-midwoofer
Best box: 5.8 L bass reflex tuned to 50.3 Hz · F3 71.1 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Dayton Audio ND140-4 Bass-midwoofer 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) | 5.8 Liters |
| Tuning Frequency (Fb) | 50.3 Hz |
| F3 (-3 dB Cutoff) | 71.1 Hz |
| F6 / F10 Extension | 57.7 Hz / 44.0 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 36.5 cm |
| First Pipe Resonance | 471.0 Hz |
| Estimated MOL @ F3 | 100.3 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.63 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.891; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 7.2 Liters |
| System Q (Qtc) | 0.891 (above Butterworth) |
| System Resonance (Fc) | 83.7 Hz |
| F3 (-3 dB Cutoff) | 73.4 Hz |
| F6 / F10 Extension | 59.2 Hz / 46.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 59.2 Hz |
| Total Q (Qts) | 0.63 |
| Electrical Q (Qes) | 0.714 |
| Mechanical Q (Qms) | 5.35 |
| Equivalent Volume (Vas) | 7.2 Liters |
| Diaphragm Area (Sd) | 220.0 cm² |
| DC Resistance (Re) | 1.0 Ω |
| Efficiency Bandwidth Product (EBP) | 82.9 |
| Linear Excursion (Xmax) | 4.0 mm |
| Thermal Power (Pe) | 40.0 W |
| Nominal Diameter | 8.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Dayton Audio ND140-4 Bass-midwoofer?
Load Forge's calculated alignment puts Dayton Audio ND140-4 Bass-midwoofer in a 5.8 liter vented enclosure tuned to 50.3 Hz, reaching an F3 cutoff of approximately 71.1 Hz.
Can Dayton Audio ND140-4 Bass-midwoofer be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 7.2 liters with a Qtc of 0.891 (above Butterworth), the system exhibits an F3 of 73.4 Hz.
What port dimensions should be used for Dayton Audio ND140-4 Bass-midwoofer to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 36.5 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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