What is the recommended ported (bass reflex) box volume for Beyma 5CX200Nd/N?

According to electroacoustic alignment calculations, Beyma 5CX200Nd/N performs optimally in a 3.5 liter vented enclosure tuned to 99.1 Hz, reaching an F3 cutoff of approximately 104.8 Hz.

Can Beyma 5CX200Nd/N be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 1.7 liters with a Qtc of 0.707, the system exhibits an F3 of 147.4 Hz with tight transient response and natural roll-off.

What port dimensions should be used for Beyma 5CX200Nd/N 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 13.5 cm is recommended.

Reflex Optimized

Beyma 5CX200Nd/N

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

220.02 GBP

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Recommended Bass Reflex (Vented)

OPTIMIZED EXTENSION

Net Box Volume (Vb)	3.5 Liters
Tuning Frequency (Fb)	99.1 Hz
F3 (-3 dB Cutoff)	104.8 Hz
F6 / F10 Extension	91.1 Hz / 78.7 Hz
Port Inner Diameter	Ø 5.0 cm
Port Physical Length	13.5 cm
First Pipe Resonance	1270.0 Hz
Estimated MOL @ F3	113.8 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	1.7 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	182.4 Hz
F3 (-3 dB Cutoff)	147.4 Hz
F6 / F10 Extension	117.7 Hz / 90.6 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	75.0 Hz
Total Q (Qts)	0.28
Electrical Q (Qes)	0.288
Mechanical Q (Qms)	10.0

Equivalent Volume (Vas)	9.1 Liters
Diaphragm Area (Sd)	95.0 cm²
DC Resistance (Re)	5.2 Ω
Efficiency Bandwidth Product (EBP)	260.4

Linear Excursion (Xmax)	5.7 mm
Thermal Power (Pe)	300.0 W
Nominal Diameter	5.0"
Catalog Source	Manufacturer Official Datasheet

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[b]Beyma 5CX200Nd/N[/b] — 3.5L Bass Reflex tuned to 99.1Hz (F3: 104.8Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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