What is the recommended ported (bass reflex) box volume for Beyma LOUDSPEAKER 18"LEX1600Nd 8 OH?

According to electroacoustic alignment calculations, Beyma LOUDSPEAKER 18"LEX1600Nd 8 OH performs optimally in a 307.4 liter vented enclosure tuned to 29.6 Hz, reaching an F3 cutoff of approximately 28.4 Hz.

Can Beyma LOUDSPEAKER 18"LEX1600Nd 8 OH be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 135.6 liters with a Qtc of 0.707, the system exhibits an F3 of 52.9 Hz with tight transient response and natural roll-off.

What port dimensions should be used for Beyma LOUDSPEAKER 18"LEX1600Nd 8 OH to avoid port chuffing?

To keep vent air velocity below turbulence limits at rated power, a minimum port diameter of 20.0 cm with a length of 20.7 cm is recommended.

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Beyma LOUDSPEAKER 18"LEX1600Nd 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

398.15 GBP

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⚠️ Engineering Notice for Builders

Large enclosure volume (307.4 L) requires extensive internal matrix bracing to prevent panel resonance.

Recommended Bass Reflex (Vented)

OPTIMIZED EXTENSION

Net Box Volume (Vb)	307.4 Liters
Tuning Frequency (Fb)	29.6 Hz
F3 (-3 dB Cutoff)	28.4 Hz
F6 / F10 Extension	26.1 Hz / 23.4 Hz
Port Inner Diameter	Ø 20.0 cm
Port Physical Length	20.7 cm
First Pipe Resonance	832.0 Hz
Estimated MOL @ F3	123.3 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	135.6 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	51.8 Hz
F3 (-3 dB Cutoff)	52.9 Hz
F6 / F10 Extension	36.2 Hz / 25.6 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	33.0 Hz
Total Q (Qts)	0.43
Electrical Q (Qes)	0.447
Mechanical Q (Qms)	11.4

Equivalent Volume (Vas)	231.0 Liters
Diaphragm Area (Sd)	1255.0 cm²
DC Resistance (Re)	5.8 Ω
Efficiency Bandwidth Product (EBP)	73.8

Linear Excursion (Xmax)	14.5 mm
Thermal Power (Pe)	1600.0 W
Nominal Diameter	18.0"
Catalog Source	Manufacturer Official Datasheet

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Beyma LOUDSPEAKER 18"LEX1600Nd 8 OH Enclosure Card

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[url=https://loadforge.io/drivers/beyma-loudspeaker-18inlex1600nd-8-oh][img]https://loadforge.io/api/v1/card/beyma-loudspeaker-18inlex1600nd-8-oh.svg[/img][/url]
[b]Beyma LOUDSPEAKER 18"LEX1600Nd 8 OH[/b] — 307.4L Bass Reflex tuned to 29.6Hz (F3: 28.4Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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