What is the recommended ported (bass reflex) box volume for SB Acoustics WO34HC-4?

According to electroacoustic alignment calculations, SB Acoustics WO34HC-4 performs optimally in a 51.5 liter vented enclosure tuned to 31.5 Hz, reaching an F3 cutoff of approximately 37.6 Hz.

Can SB Acoustics WO34HC-4 be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 27.6 liters with a Qtc of 0.707, the system exhibits an F3 of 59.0 Hz with tight transient response and natural roll-off.

What port dimensions should be used for SB Acoustics WO34HC-4 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 63.0 cm is recommended.

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SB Acoustics WO34HC-4

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

369.95 EUR

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⚠️ Engineering Notice for Builders

Port length (63.0 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)	51.5 Liters
Tuning Frequency (Fb)	31.5 Hz
F3 (-3 dB Cutoff)	37.6 Hz
F6 / F10 Extension	31.7 Hz / 26.8 Hz
Port Inner Diameter	Ø 12.5 cm
Port Physical Length	63.0 cm
First Pipe Resonance	273.0 Hz
Estimated MOL @ F3	110.1 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	27.6 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	59.9 Hz
F3 (-3 dB Cutoff)	59.0 Hz
F6 / F10 Extension	45.0 Hz / 34.2 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	20.0 Hz
Total Q (Qts)	0.23
Electrical Q (Qes)	0.24
Mechanical Q (Qms)	5.53

Equivalent Volume (Vas)	233.0 Liters
Diaphragm Area (Sd)	585.0 cm²
DC Resistance (Re)	3.5 Ω
Efficiency Bandwidth Product (EBP)	83.3

Linear Excursion (Xmax)	16.6 mm
Thermal Power (Pe)	200.0 W
Nominal Diameter	13.5"
Catalog Source	Manufacturer Official Datasheet

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[b]SB Acoustics WO34HC-4[/b] — 51.5L Bass Reflex tuned to 31.5Hz (F3: 37.6Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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