What is the recommended ported (bass reflex) box volume for Beyma LOUDSPEAKER 18PW1400FE /S 8 OH?

According to electroacoustic alignment calculations, Beyma LOUDSPEAKER 18PW1400FE /S 8 OH performs optimally in a 80.1 liter vented enclosure tuned to 43.7 Hz, reaching an F3 cutoff of approximately 47.1 Hz.

Can Beyma LOUDSPEAKER 18PW1400FE /S 8 OH be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 39.1 liters with a Qtc of 0.707, the system exhibits an F3 of 79.8 Hz with tight transient response and natural roll-off.

What port dimensions should be used for Beyma LOUDSPEAKER 18PW1400FE /S 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 47.3 cm is recommended.

Reflex Optimized

Beyma LOUDSPEAKER 18PW1400FE /S 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

389.51 GBP

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⚠️ Engineering Notice for Builders

Port length (47.3 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)	80.1 Liters
Tuning Frequency (Fb)	43.7 Hz
F3 (-3 dB Cutoff)	47.1 Hz
F6 / F10 Extension	41.6 Hz / 36.3 Hz
Port Inner Diameter	Ø 20.0 cm
Port Physical Length	47.3 cm
First Pipe Resonance	364.0 Hz
Estimated MOL @ F3	123.9 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	39.1 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	80.0 Hz
F3 (-3 dB Cutoff)	79.8 Hz
F6 / F10 Extension	59.0 Hz / 43.9 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	32.0 Hz
Total Q (Qts)	0.27
Electrical Q (Qes)	0.277
Mechanical Q (Qms)	10.2

Equivalent Volume (Vas)	228.9 Liters
Diaphragm Area (Sd)	1255.0 cm²
DC Resistance (Re)	5.1 Ω
Efficiency Bandwidth Product (EBP)	115.4

Linear Excursion (Xmax)	10.0 mm
Thermal Power (Pe)	1400.0 W
Nominal Diameter	18.0"
Catalog Source	Manufacturer Official Datasheet

Shareable Acoustic Card for Forums & Social Media

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Beyma LOUDSPEAKER 18PW1400FE /S 8 OH Enclosure Card

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[b]Beyma LOUDSPEAKER 18PW1400FE /S 8 OH[/b] — 80.1L Bass Reflex tuned to 43.7Hz (F3: 47.1Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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