What is the recommended ported (bass reflex) box volume for SB Acoustics MW13PNW-8?

According to electroacoustic alignment calculations, SB Acoustics MW13PNW-8 performs optimally in a 7.8 liter vented enclosure tuned to 49.4 Hz, reaching an F3 cutoff of approximately 51.4 Hz.

Can SB Acoustics MW13PNW-8 be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 3.6 liters with a Qtc of 0.707, the system exhibits an F3 of 92.1 Hz with tight transient response and natural roll-off.

What port dimensions should be used for SB Acoustics MW13PNW-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 27.3 cm is recommended.

Reflex Optimized

SB Acoustics MW13PNW-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

166.95 EUR

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Recommended Bass Reflex (Vented)

OPTIMIZED EXTENSION

Net Box Volume (Vb)	7.8 Liters
Tuning Frequency (Fb)	49.4 Hz
F3 (-3 dB Cutoff)	51.4 Hz
F6 / F10 Extension	44.8 Hz / 39.0 Hz
Port Inner Diameter	Ø 5.0 cm
Port Physical Length	27.3 cm
First Pipe Resonance	629.0 Hz
Estimated MOL @ F3	99.2 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	3.6 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	91.6 Hz
F3 (-3 dB Cutoff)	92.1 Hz
F6 / F10 Extension	69.4 Hz / 52.2 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	41.0 Hz
Total Q (Qts)	0.31
Electrical Q (Qes)	0.337
Mechanical Q (Qms)	3.84

Equivalent Volume (Vas)	15.0 Liters
Diaphragm Area (Sd)	70.0 cm²
DC Resistance (Re)	6.0 Ω
Efficiency Bandwidth Product (EBP)	121.6

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

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[b]SB Acoustics MW13PNW-8[/b] — 7.8L Bass Reflex tuned to 49.4Hz (F3: 51.4Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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