What is the recommended ported (bass reflex) box volume for Dayton Audio ND105-8?

According to electroacoustic alignment calculations, Dayton Audio ND105-8 performs optimally in a 2.4 liter vented enclosure tuned to 56.6 Hz, reaching an F3 cutoff of approximately 81.7 Hz.

Can Dayton Audio ND105-8 be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 20.1 liters with a Qtc of 0.707, the system exhibits an F3 of 70.8 Hz with tight transient response and natural roll-off.

What port dimensions should be used for Dayton Audio ND105-8 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 73.0 cm is recommended.

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Dayton Audio ND105-8

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

36.45 EUR

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⚠️ Engineering Notice for Builders

Port length (73.0 cm) is long; consider an elbow bend, slotted vent, or passive radiator to avoid box collision.

Recommended Bass Reflex (Vented)

OPTIMIZED EXTENSION

Net Box Volume (Vb)	2.4 Liters
Tuning Frequency (Fb)	56.6 Hz
F3 (-3 dB Cutoff)	81.7 Hz
F6 / F10 Extension	67.0 Hz / 51.2 Hz
Port Inner Diameter	Ø 5.0 cm
Port Physical Length	73.0 cm
First Pipe Resonance	236.0 Hz
Estimated MOL @ F3	97.1 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	20.1 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	70.4 Hz
F3 (-3 dB Cutoff)	70.8 Hz
F6 / F10 Extension	53.7 Hz / 40.7 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	66.6 Hz
Total Q (Qts)	0.66
Electrical Q (Qes)	0.749
Mechanical Q (Qms)	5.57

Equivalent Volume (Vas)	3.0 Liters
Diaphragm Area (Sd)	51.5 cm²
DC Resistance (Re)	7.7 Ω
Efficiency Bandwidth Product (EBP)	89.0

Linear Excursion (Xmax)	4.0 mm
Thermal Power (Pe)	30.0 W
Nominal Diameter	4.0"
Catalog Source	Manufacturer Official Datasheet

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[b]Dayton Audio ND105-8[/b] — 2.4L Bass Reflex tuned to 56.6Hz (F3: 81.7Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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