What is the recommended ported (bass reflex) box volume for Dayton Audio ND140-4?

According to electroacoustic alignment calculations, Dayton Audio ND140-4 performs optimally in a 5.8 liter vented enclosure tuned to 50.3 Hz, reaching an F3 cutoff of approximately 74.7 Hz.

Can Dayton Audio ND140-4 be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 27.8 liters with a Qtc of 0.707, the system exhibits an F3 of 57.9 Hz with tight transient response and natural roll-off.

What port dimensions should be used for Dayton Audio ND140-4 to avoid port chuffing?

To keep vent air velocity below turbulence limits at rated power, a minimum port diameter of 5.0 cm with a length of 36.5 cm is recommended.

Versatile Load

Dayton Audio ND140-4

Complete Thiele/Small parameters, optimized ported (bass reflex) and sealed enclosure designs, F3/F6/F10 cutoffs, and vent turbulence analysis calculated by Load Forge.

Estimated Retail

38.45 EUR

Check Price & Availability ↗ Open in Load Forge Simulator ↗

Recommended Bass Reflex (Vented)

OPTIMIZED EXTENSION

Net Box Volume (Vb)	5.8 Liters
Tuning Frequency (Fb)	50.3 Hz
F3 (-3 dB Cutoff)	74.7 Hz
F6 / F10 Extension	62.7 Hz / 48.8 Hz
Port Inner Diameter	Ø 5.0 cm
Port Physical Length	36.5 cm
First Pipe Resonance	471.0 Hz
Estimated MOL @ F3	101.0 dB SPL

Simulate This Reflex Box in App →

Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	27.8 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	65.1 Hz
F3 (-3 dB Cutoff)	57.9 Hz
F6 / F10 Extension	46.7 Hz / 36.8 Hz
Air Spring Linearity	High (Zero port compression)

Simulate This Sealed Box in App →

Verified 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)	86.6 cm²
DC Resistance (Re)	3.7 Ω
Efficiency Bandwidth Product (EBP)	82.9

Linear Excursion (Xmax)	4.0 mm
Thermal Power (Pe)	40.0 W
Nominal Diameter	5.25"
Catalog Source	Manufacturer Official Datasheet

Shareable Acoustic Card for Forums & Social Media

Embed this verified design card on DIYAudio, AVSForum, Reddit, or Facebook. Includes verified F3, MOL, and box parameters.

Copy Forum BBCode (DIYAudio / AVSForum)

[url=https://loadforge.io/drivers/dayton-audio-nd140-4][img]https://loadforge.io/api/v1/card/dayton-audio-nd140-4.svg[/img][/url]
[b]Dayton Audio ND140-4[/b] — 5.8L Bass Reflex tuned to 50.3Hz (F3: 74.7Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

Download SVG Card 📥

Not sure if ND140-4 fits your physical space?

Don't force a driver into the wrong box. Use Bass Match to calculate which of 9,000+ verified manufacturer drivers delivers the highest SPL, lowest F3, and cleanest port air velocity for your exact trunk or room dimensions.

Run Bass Match for Your Space ⚡