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

According to electroacoustic alignment calculations, Beyma LOUDSPEAKER 6NMFW 8 OH performs optimally in a 7.5 liter vented enclosure tuned to 44.4 Hz, reaching an F3 cutoff of approximately 45.3 Hz.

Can Beyma LOUDSPEAKER 6NMFW 8 OH be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 3.3 liters with a Qtc of 0.707, the system exhibits an F3 of 85.6 Hz with tight transient response and natural roll-off.

What port dimensions should be used for Beyma LOUDSPEAKER 6NMFW 8 OH to avoid port chuffing?

To keep vent air velocity below turbulence limits at rated power, a minimum port diameter of 6.8 cm with a length of 68.8 cm is recommended.

Reflex Optimized

Beyma LOUDSPEAKER 6NMFW 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

279.95 EUR

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⚠️ Engineering Notice for Builders

Port length (68.8 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)	7.5 Liters
Tuning Frequency (Fb)	44.4 Hz
F3 (-3 dB Cutoff)	45.3 Hz
F6 / F10 Extension	40.7 Hz / 36.0 Hz
Port Inner Diameter	Ø 6.8 cm
Port Physical Length	68.8 cm
First Pipe Resonance	250.0 Hz
Estimated MOL @ F3	104.7 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	3.3 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	82.3 Hz
F3 (-3 dB Cutoff)	85.6 Hz
F6 / F10 Extension	61.3 Hz / 44.4 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	40.0 Hz
Total Q (Qts)	0.34
Electrical Q (Qes)	0.356
Mechanical Q (Qms)	7.5

Equivalent Volume (Vas)	11.0 Liters
Diaphragm Area (Sd)	154.0 cm²
DC Resistance (Re)	5.8 Ω
Efficiency Bandwidth Product (EBP)	112.3

Linear Excursion (Xmax)	9.0 mm
Thermal Power (Pe)	200.0 W
Nominal Diameter	6.5"
Catalog Source	Manufacturer Official Datasheet

Shareable Acoustic Card for Forums & Social Media

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Beyma LOUDSPEAKER 6NMFW 8 OH Enclosure Card

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[url=https://loadforge.io/drivers/beyma-loudspeaker-6nmfw-8-oh][img]https://loadforge.io/api/v1/card/beyma-loudspeaker-6nmfw-8-oh.svg[/img][/url]
[b]Beyma LOUDSPEAKER 6NMFW 8 OH[/b] — 7.5L Bass Reflex tuned to 44.4Hz (F3: 45.3Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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