What is the recommended ported (bass reflex) box volume for SB Acoustics SB10PGC21-4?

According to electroacoustic alignment calculations, SB Acoustics SB10PGC21-4 performs optimally in a 1.5 liter vented enclosure tuned to 75.6 Hz, reaching an F3 cutoff of approximately 97.8 Hz.

Can SB Acoustics SB10PGC21-4 be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 4.8 liters with a Qtc of 1.029, the system exhibits an F3 of 83.7 Hz with tight transient response and natural roll-off.

What port dimensions should be used for SB Acoustics SB10PGC21-4 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 65.1 cm is recommended.

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SB Acoustics SB10PGC21-4

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

18.95 EUR

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⚠️ Engineering Notice for Builders

Port length (65.1 cm) is long; consider an elbow bend, slotted vent, or passive radiator to avoid box collision.
Limited linear excursion (Xmax: 2.25 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.

Recommended Bass Reflex (Vented)

OPTIMIZED EXTENSION

Net Box Volume (Vb)	1.5 Liters
Tuning Frequency (Fb)	75.6 Hz
F3 (-3 dB Cutoff)	97.8 Hz
F6 / F10 Extension	80.5 Hz / 59.5 Hz
Port Inner Diameter	Ø 5.0 cm
Port Physical Length	65.1 cm
First Pipe Resonance	264.0 Hz
Estimated MOL @ F3	94.3 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	4.8 Liters
System Q (Qtc)	1.029 (Butterworth Q=0.707)
System Resonance (Fc)	98.3 Hz
F3 (-3 dB Cutoff)	83.7 Hz
F6 / F10 Extension	69.4 Hz / 55.8 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	89.0 Hz
Total Q (Qts)	0.92
Electrical Q (Qes)	1.002
Mechanical Q (Qms)	11.2

Equivalent Volume (Vas)	1.2 Liters
Diaphragm Area (Sd)	27.0 cm²
DC Resistance (Re)	3.4 Ω
Efficiency Bandwidth Product (EBP)	88.8

Linear Excursion (Xmax)	2.2 mm
Thermal Power (Pe)	20.0 W
Nominal Diameter	3.0"
Catalog Source	Manufacturer Official Datasheet

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[b]SB Acoustics SB10PGC21-4[/b] — 1.5L Bass Reflex tuned to 75.6Hz (F3: 97.8Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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