What is the recommended ported (bass reflex) box volume for SB Acoustics SB20FRPC30-8?

According to electroacoustic alignment calculations, SB Acoustics SB20FRPC30-8 performs optimally in a 100.5 liter vented enclosure tuned to 34.0 Hz, reaching an F3 cutoff of approximately 31.1 Hz.

Can SB Acoustics SB20FRPC30-8 be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 45.2 liters with a Qtc of 0.707, the system exhibits an F3 of 60.0 Hz with tight transient response and natural roll-off.

What port dimensions should be used for SB Acoustics SB20FRPC30-8 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 1.5 cm is recommended.

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SB Acoustics SB20FRPC30-8

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

52.45 EUR

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Recommended Bass Reflex (Vented)

OPTIMIZED EXTENSION

Net Box Volume (Vb)	100.5 Liters
Tuning Frequency (Fb)	34.0 Hz
F3 (-3 dB Cutoff)	31.1 Hz
F6 / F10 Extension	28.2 Hz / 25.3 Hz
Port Inner Diameter	Ø 5.0 cm
Port Physical Length	1.5 cm
First Pipe Resonance	11536.0 Hz
Estimated MOL @ F3	102.5 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	45.2 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	59.0 Hz
F3 (-3 dB Cutoff)	60.0 Hz
F6 / F10 Extension	45.2 Hz / 34.1 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	39.4 Hz
Total Q (Qts)	0.45
Electrical Q (Qes)	0.471
Mechanical Q (Qms)	10.1

Equivalent Volume (Vas)	66.3 Liters
Diaphragm Area (Sd)	216.0 cm²
DC Resistance (Re)	6.0 Ω
Efficiency Bandwidth Product (EBP)	83.7

Linear Excursion (Xmax)	4.1 mm
Thermal Power (Pe)	40.0 W
Nominal Diameter	8.0"
Catalog Source	Manufacturer Official Datasheet

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SB Acoustics SB20FRPC30-8 Enclosure Card

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[url=https://loadforge.io/drivers/sb-acoustics-sb20frpc30-8][img]https://loadforge.io/api/v1/card/sb-acoustics-sb20frpc30-8.svg[/img][/url]
[b]SB Acoustics SB20FRPC30-8[/b] — 100.5L Bass Reflex tuned to 34.0Hz (F3: 31.1Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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