What is the recommended ported (bass reflex) box volume for Beyma LOUDSPEAKER 6G40Nd/N 8 OH?

According to electroacoustic alignment calculations, Beyma LOUDSPEAKER 6G40Nd/N 8 OH performs optimally in a 3.5 liter vented enclosure tuned to 100.3 Hz, reaching an F3 cutoff of approximately 104.7 Hz.

Can Beyma LOUDSPEAKER 6G40Nd/N 8 OH be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 1.5 liters with a Qtc of 0.707, the system exhibits an F3 of 146.5 Hz with tight transient response and natural roll-off.

What port dimensions should be used for Beyma LOUDSPEAKER 6G40Nd/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 13.1 cm is recommended.

Reflex Optimized

Beyma LOUDSPEAKER 6G40Nd/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

114.95 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)	3.5 Liters
Tuning Frequency (Fb)	100.3 Hz
F3 (-3 dB Cutoff)	104.7 Hz
F6 / F10 Extension	93.2 Hz / 81.6 Hz
Port Inner Diameter	Ø 5.0 cm
Port Physical Length	13.1 cm
First Pipe Resonance	1309.0 Hz
Estimated MOL @ F3	110.8 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	1.5 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	180.3 Hz
F3 (-3 dB Cutoff)	146.5 Hz
F6 / F10 Extension	116.7 Hz / 89.7 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	100.0 Hz
Total Q (Qts)	0.38
Electrical Q (Qes)	0.454
Mechanical Q (Qms)	2.33

Equivalent Volume (Vas)	3.7 Liters
Diaphragm Area (Sd)	140.0 cm²
DC Resistance (Re)	6.0 Ω
Efficiency Bandwidth Product (EBP)	220.2

Linear Excursion (Xmax)	3.0 mm
Thermal Power (Pe)	170.0 W
Nominal Diameter	6.5"
Catalog Source	Manufacturer Official Datasheet

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Beyma LOUDSPEAKER 6G40Nd/N 8 OH Enclosure Card

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[url=https://loadforge.io/drivers/beyma-loudspeaker-6g40ndn-8-oh][img]https://loadforge.io/api/v1/card/beyma-loudspeaker-6g40ndn-8-oh.svg[/img][/url]
[b]Beyma LOUDSPEAKER 6G40Nd/N 8 OH[/b] — 3.5L Bass Reflex tuned to 100.3Hz (F3: 104.7Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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