What is the recommended ported (bass reflex) box volume for SB Acoustics SB17CRC35-4?

According to electroacoustic alignment calculations, SB Acoustics SB17CRC35-4 performs optimally in a 20.2 liter vented enclosure tuned to 36.9 Hz, reaching an F3 cutoff of approximately 38.2 Hz.

Can SB Acoustics SB17CRC35-4 be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 9.1 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 SB17CRC35-4 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 17.8 cm is recommended.

Reflex Optimized

SB Acoustics SB17CRC35-4

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

109.95 EUR

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Recommended Bass Reflex (Vented)

OPTIMIZED EXTENSION

Net Box Volume (Vb)	20.2 Liters
Tuning Frequency (Fb)	36.9 Hz
F3 (-3 dB Cutoff)	38.2 Hz
F6 / F10 Extension	33.4 Hz / 29.0 Hz
Port Inner Diameter	Ø 5.0 cm
Port Physical Length	17.8 cm
First Pipe Resonance	965.0 Hz
Estimated MOL @ F3	101.2 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	9.1 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	68.1 Hz
F3 (-3 dB Cutoff)	69.2 Hz
F6 / F10 Extension	52.1 Hz / 39.2 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	31.5 Hz
Total Q (Qts)	0.32
Electrical Q (Qes)	0.346
Mechanical Q (Qms)	4.32

Equivalent Volume (Vas)	35.5 Liters
Diaphragm Area (Sd)	118.0 cm²
DC Resistance (Re)	3.1 Ω
Efficiency Bandwidth Product (EBP)	91.1

Linear Excursion (Xmax)	5.5 mm
Thermal Power (Pe)	60.0 W
Nominal Diameter	6.0"
Catalog Source	Manufacturer Official Datasheet

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[b]SB Acoustics SB17CRC35-4[/b] — 20.2L Bass Reflex tuned to 36.9Hz (F3: 38.2Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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