What is the recommended ported (bass reflex) box volume for Beyma LOUDSPEAKER 5G40Nd/N 8 OH?

According to electroacoustic alignment calculations, Beyma LOUDSPEAKER 5G40Nd/N 8 OH performs optimally in a 2.1 liter vented enclosure tuned to 120.6 Hz, reaching an F3 cutoff of approximately 117.5 Hz.

Can Beyma LOUDSPEAKER 5G40Nd/N 8 OH be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 1.0 liters with a Qtc of 0.707, the system exhibits an F3 of 141.7 Hz with tight transient response and natural roll-off.

What port dimensions should be used for Beyma LOUDSPEAKER 5G40Nd/N 8 OH 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 15.7 cm is recommended.

Reflex Optimized

Beyma LOUDSPEAKER 5G40Nd/N 8 OH

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

109.95 EUR

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⚠️ Engineering Notice for Builders

Limited linear excursion (Xmax: 3.0 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)	2.1 Liters
Tuning Frequency (Fb)	120.6 Hz
F3 (-3 dB Cutoff)	117.5 Hz
F6 / F10 Extension	107.5 Hz / 96.3 Hz
Port Inner Diameter	Ø 5.0 cm
Port Physical Length	15.7 cm
First Pipe Resonance	1096.0 Hz
Estimated MOL @ F3	107.8 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	1.0 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	215.2 Hz
F3 (-3 dB Cutoff)	141.7 Hz
F6 / F10 Extension	109.2 Hz / 81.4 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	140.0 Hz
Total Q (Qts)	0.45
Electrical Q (Qes)	0.536
Mechanical Q (Qms)	2.8

Equivalent Volume (Vas)	1.4 Liters
Diaphragm Area (Sd)	85.0 cm²
DC Resistance (Re)	6.6 Ω
Efficiency Bandwidth Product (EBP)	261.1

Linear Excursion (Xmax)	3.0 mm
Thermal Power (Pe)	100.0 W
Nominal Diameter	5.0"
Catalog Source	Manufacturer Official Datasheet

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Beyma LOUDSPEAKER 5G40Nd/N 8 OH Enclosure Card

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[url=https://loadforge.io/drivers/beyma-loudspeaker-5g40ndn-8-oh][img]https://loadforge.io/api/v1/card/beyma-loudspeaker-5g40ndn-8-oh.svg[/img][/url]
[b]Beyma LOUDSPEAKER 5G40Nd/N 8 OH[/b] — 2.1L Bass Reflex tuned to 120.6Hz (F3: 117.5Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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