What is the recommended ported (bass reflex) box volume for Beyma LOUDSPEAKER 15"WRS 400 8 OH?

According to electroacoustic alignment calculations, Beyma LOUDSPEAKER 15"WRS 400 8 OH performs optimally in a 146.9 liter vented enclosure tuned to 41.0 Hz, reaching an F3 cutoff of approximately 41.1 Hz.

Can Beyma LOUDSPEAKER 15"WRS 400 8 OH be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 65.7 liters with a Qtc of 0.707, the system exhibits an F3 of 71.7 Hz with tight transient response and natural roll-off.

What port dimensions should be used for Beyma LOUDSPEAKER 15"WRS 400 8 OH to avoid port chuffing?

To keep vent air velocity below turbulence limits at rated power, a minimum port diameter of 12.5 cm with a length of 6.0 cm is recommended.

Reflex Optimized

Beyma LOUDSPEAKER 15"WRS 400 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

151.70 GBP

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⚠️ Engineering Notice for Builders

Large enclosure volume (146.9 L) requires extensive internal matrix bracing to prevent panel resonance.

Recommended Bass Reflex (Vented)

OPTIMIZED EXTENSION

Net Box Volume (Vb)	146.9 Liters
Tuning Frequency (Fb)	41.0 Hz
F3 (-3 dB Cutoff)	41.1 Hz
F6 / F10 Extension	37.2 Hz / 32.9 Hz
Port Inner Diameter	Ø 12.5 cm
Port Physical Length	6.0 cm
First Pipe Resonance	2887.0 Hz
Estimated MOL @ F3	119.1 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	65.7 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	72.1 Hz
F3 (-3 dB Cutoff)	71.7 Hz
F6 / F10 Extension	51.7 Hz / 37.8 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	36.0 Hz
Total Q (Qts)	0.33
Electrical Q (Qes)	0.342
Mechanical Q (Qms)	9.1

Equivalent Volume (Vas)	236.0 Liters
Diaphragm Area (Sd)	880.0 cm²
DC Resistance (Re)	5.6 Ω
Efficiency Bandwidth Product (EBP)	105.1

Linear Excursion (Xmax)	6.3 mm
Thermal Power (Pe)	400.0 W
Nominal Diameter	15.0"
Catalog Source	Manufacturer Official Datasheet

Shareable Acoustic Card for Forums & Social Media

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Beyma LOUDSPEAKER 15"WRS 400 8 OH Enclosure Card

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[url=https://loadforge.io/drivers/beyma-loudspeaker-15inwrs-400-8-oh][img]https://loadforge.io/api/v1/card/beyma-loudspeaker-15inwrs-400-8-oh.svg[/img][/url]
[b]Beyma LOUDSPEAKER 15"WRS 400 8 OH[/b] — 146.9L Bass Reflex tuned to 41.0Hz (F3: 41.1Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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