What is the recommended ported (bass reflex) box volume for SB Acoustics SB15CRC30-8?

According to electroacoustic alignment calculations, SB Acoustics SB15CRC30-8 performs optimally in a 17.3 liter vented enclosure tuned to 37.5 Hz, reaching an F3 cutoff of approximately 35.9 Hz.

Can SB Acoustics SB15CRC30-8 be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 7.5 liters with a Qtc of 0.707, the system exhibits an F3 of 69.2 Hz with tight transient response and natural roll-off.

What port dimensions should be used for SB Acoustics SB15CRC30-8 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 20.6 cm is recommended.

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SB Acoustics SB15CRC30-8

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

114.95 EUR

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Recommended Bass Reflex (Vented)

OPTIMIZED EXTENSION

Net Box Volume (Vb)	17.3 Liters
Tuning Frequency (Fb)	37.5 Hz
F3 (-3 dB Cutoff)	35.9 Hz
F6 / F10 Extension	32.0 Hz / 28.3 Hz
Port Inner Diameter	Ø 5.0 cm
Port Physical Length	20.6 cm
First Pipe Resonance	834.0 Hz
Estimated MOL @ F3	98.8 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	7.5 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	67.7 Hz
F3 (-3 dB Cutoff)	69.2 Hz
F6 / F10 Extension	52.2 Hz / 39.4 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	40.0 Hz
Total Q (Qts)	0.41
Electrical Q (Qes)	0.464
Mechanical Q (Qms)	3.52

Equivalent Volume (Vas)	14.9 Liters
Diaphragm Area (Sd)	82.0 cm²
DC Resistance (Re)	5.9 Ω
Efficiency Bandwidth Product (EBP)	86.2

Linear Excursion (Xmax)	5.5 mm
Thermal Power (Pe)	50.0 W
Nominal Diameter	5.0"
Catalog Source	Manufacturer Official Datasheet

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[b]SB Acoustics SB15CRC30-8[/b] — 17.3L Bass Reflex tuned to 37.5Hz (F3: 35.9Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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