What is the recommended ported (bass reflex) box volume for SB Acoustics SB15SFCR39-8?

According to electroacoustic alignment calculations, SB Acoustics SB15SFCR39-8 performs optimally in a 60.1 liter vented enclosure tuned to 29.3 Hz, reaching an F3 cutoff of approximately 27.5 Hz.

Can SB Acoustics SB15SFCR39-8 be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 26.3 liters with a Qtc of 0.707, the system exhibits an F3 of 53.7 Hz with tight transient response and natural roll-off.

What port dimensions should be used for SB Acoustics SB15SFCR39-8 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 7.8 cm is recommended.

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SB Acoustics SB15SFCR39-8

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

47.45 EUR

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Recommended Bass Reflex (Vented)

OPTIMIZED EXTENSION

Net Box Volume (Vb)	60.1 Liters
Tuning Frequency (Fb)	29.3 Hz
F3 (-3 dB Cutoff)	27.5 Hz
F6 / F10 Extension	24.7 Hz / 22.0 Hz
Port Inner Diameter	Ø 5.0 cm
Port Physical Length	7.8 cm
First Pipe Resonance	2196.0 Hz
Estimated MOL @ F3	100.9 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	26.3 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	52.5 Hz
F3 (-3 dB Cutoff)	53.7 Hz
F6 / F10 Extension	40.3 Hz / 30.4 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	32.0 Hz
Total Q (Qts)	0.42
Electrical Q (Qes)	0.446
Mechanical Q (Qms)	7.11

Equivalent Volume (Vas)	48.3 Liters
Diaphragm Area (Sd)	178.0 cm²
DC Resistance (Re)	6.2 Ω
Efficiency Bandwidth Product (EBP)	71.7

Linear Excursion (Xmax)	5.0 mm
Thermal Power (Pe)	50.0 W
Nominal Diameter	7.5"
Catalog Source	Manufacturer Official Datasheet

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SB Acoustics SB15SFCR39-8 Enclosure Card

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[b]SB Acoustics SB15SFCR39-8[/b] — 60.1L Bass Reflex tuned to 29.3Hz (F3: 27.5Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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