What is the recommended ported (bass reflex) box volume for Dayton Audio MB620-8?

According to electroacoustic alignment calculations, Dayton Audio MB620-8 performs optimally in a 10.2 liter vented enclosure tuned to 72.8 Hz, reaching an F3 cutoff of approximately 88.6 Hz.

Can Dayton Audio MB620-8 be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 15.5 liters with a Qtc of 0.707, the system exhibits an F3 of 113.2 Hz with tight transient response and natural roll-off.

What port dimensions should be used for Dayton Audio MB620-8 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 7.3 cm is recommended.

Reflex Optimized

Dayton Audio MB620-8

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

58.45 EUR

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⚠️ Engineering Notice for Builders

Limited linear excursion (Xmax: 2.0 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.

Recommended Bass Reflex (Vented)

OPTIMIZED EXTENSION

Net Box Volume (Vb)	10.2 Liters
Tuning Frequency (Fb)	72.8 Hz
F3 (-3 dB Cutoff)	88.6 Hz
F6 / F10 Extension	65.2 Hz / 55.4 Hz
Port Inner Diameter	Ø 5.0 cm
Port Physical Length	7.3 cm
First Pipe Resonance	2352.0 Hz
Estimated MOL @ F3	107.1 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	15.5 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	119.3 Hz
F3 (-3 dB Cutoff)	113.2 Hz
F6 / F10 Extension	87.4 Hz / 66.6 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	104.0 Hz
Total Q (Qts)	0.59
Electrical Q (Qes)	0.684
Mechanical Q (Qms)	4.29

Equivalent Volume (Vas)	6.8 Liters
Diaphragm Area (Sd)	132.7 cm²
DC Resistance (Re)	5.47 Ω
Efficiency Bandwidth Product (EBP)	152.0

Linear Excursion (Xmax)	2.0 mm
Thermal Power (Pe)	200.0 W
Nominal Diameter	6.5"
Catalog Source	Manufacturer Official Datasheet

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[b]Dayton Audio MB620-8[/b] — 10.2L Bass Reflex tuned to 72.8Hz (F3: 88.6Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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