Dayton Audio ND140-8 Bass-midwoofer
Best box: 6.2 L bass reflex tuned to 48.0 Hz · F3 69.0 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Dayton Audio ND140-8 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) | 6.2 Liters |
| Tuning Frequency (Fb) | 48.0 Hz |
| F3 (-3 dB Cutoff) | 69.0 Hz |
| F6 / F10 Extension | 56.7 Hz / 43.3 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 37.6 cm |
| First Pipe Resonance | 457.0 Hz |
| Estimated MOL @ F3 | 100.1 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.68 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.962; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 7.7 Liters |
| System Q (Qtc) | 0.962 (above Butterworth) |
| System Resonance (Fc) | 79.9 Hz |
| F3 (-3 dB Cutoff) | 68.6 Hz |
| F6 / F10 Extension | 56.1 Hz / 44.6 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 56.5 Hz |
| Total Q (Qts) | 0.68 |
| Electrical Q (Qes) | 0.787 |
| Mechanical Q (Qms) | 5.01 |
| Equivalent Volume (Vas) | 7.7 Liters |
| Diaphragm Area (Sd) | 220.0 cm² |
| DC Resistance (Re) | 1.0 Ω |
| Efficiency Bandwidth Product (EBP) | 71.8 |
| 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 ND140-8 Bass-midwoofer?
Load Forge's calculated alignment puts Dayton Audio ND140-8 Bass-midwoofer in a 6.2 liter vented enclosure tuned to 48.0 Hz, reaching an F3 cutoff of approximately 69.0 Hz.
Can Dayton Audio ND140-8 Bass-midwoofer be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 7.7 liters with a Qtc of 0.962 (above Butterworth), the system exhibits an F3 of 68.6 Hz.
What port dimensions should be used for Dayton Audio ND140-8 Bass-midwoofer to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 37.6 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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