What is the recommended ported (bass reflex) box volume for SB Acoustics SB13PFC25-4-COAX?

According to electroacoustic alignment calculations, SB Acoustics SB13PFC25-4-COAX performs optimally in a 5.0 liter vented enclosure tuned to 58.7 Hz, reaching an F3 cutoff of approximately 64.4 Hz.

Can SB Acoustics SB13PFC25-4-COAX be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 2.5 liters with a Qtc of 0.707, the system exhibits an F3 of 107.7 Hz with tight transient response and natural roll-off.

What port dimensions should be used for SB Acoustics SB13PFC25-4-COAX 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 30.6 cm is recommended.

Reflex Optimized

SB Acoustics SB13PFC25-4-COAX

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

54.95 EUR

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Recommended Bass Reflex (Vented)

OPTIMIZED EXTENSION

Net Box Volume (Vb)	5.0 Liters
Tuning Frequency (Fb)	58.7 Hz
F3 (-3 dB Cutoff)	64.4 Hz
F6 / F10 Extension	55.4 Hz / 47.6 Hz
Port Inner Diameter	Ø 5.0 cm
Port Physical Length	30.6 cm
First Pipe Resonance	562.0 Hz
Estimated MOL @ F3	99.9 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	2.5 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	110.3 Hz
F3 (-3 dB Cutoff)	107.7 Hz
F6 / F10 Extension	81.9 Hz / 61.8 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	43.0 Hz
Total Q (Qts)	0.27
Electrical Q (Qes)	0.307
Mechanical Q (Qms)	2.26

Equivalent Volume (Vas)	14.4 Liters
Diaphragm Area (Sd)	82.0 cm²
DC Resistance (Re)	3.2 Ω
Efficiency Bandwidth Product (EBP)	140.2

Linear Excursion (Xmax)	4.7 mm
Thermal Power (Pe)	40.0 W
Nominal Diameter	5.0"
Catalog Source	Manufacturer Official Datasheet

Shareable Acoustic Card for Forums & Social Media

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SB Acoustics SB13PFC25-4-COAX Enclosure Card

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[url=https://loadforge.io/drivers/sb-acoustics-sb13pfc25-4-coax][img]https://loadforge.io/api/v1/card/sb-acoustics-sb13pfc25-4-coax.svg[/img][/url]
[b]SB Acoustics SB13PFC25-4-COAX[/b] — 5.0L Bass Reflex tuned to 58.7Hz (F3: 64.4Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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