Passive Radiator / Folded Port

SB Acoustics Satori MR16PNW-8 Bass-midwoofer

Best box: 0.35 L sealed · Fc 75.4 Hz · F3 76.9 Hz

Predicted SPL response of the SB Acoustics Satori MR16PNW-8 Bass-midwoofer in the recommended 0.35 L sealed box versus the alternative — open it in the simulator Open and tweak this box live ↗

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⚠️ Engineering Notice for Builders

  • Straight vent would be 245.4 cm long: not physically buildable as a simple tube. Use a passive radiator, a folded slot port or model a 3D folded duct in Load Forge Studio.
  • Limited linear excursion (Xmax: 3.1 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.

Textbook Bass Reflex — not recommended

PORT NOT BUILDABLE
Net Box Volume (Vb) 1.5 Liters
Tuning Frequency (Fb) 39.7 Hz
F3 (-3 dB Cutoff) 37.1 Hz
F6 / F10 Extension 34.1 Hz / 30.7 Hz
Port Inner Diameter Ø 5.0 cm
Port Physical Length 245.4 cm
First Pipe Resonance 70.0 Hz
Estimated MOL @ F3 86.5 dB SPL
⚠️ Port feasibility: a straight tube would need 245.4 cm and cannot fit in a practical cabinet, and no nearby retune stays buildable without a bass hump. Prefer the sealed alignment, a passive radiator, or a 3D folded duct in Load Forge Studio.
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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING
Net Box Volume (Vb) 0.35 Liters
System Q (Qtc) 0.707 (Butterworth)
System Resonance (Fc) 75.4 Hz
F3 (-3 dB Cutoff) 76.9 Hz
F6 / F10 Extension 57.9 Hz / 43.7 Hz
Air Spring Linearity High (Zero port compression)
Simulate This Sealed Box in App →

Thiele/Small Parameters

Resonance (Fs) 32.0 Hz
Total Q (Qts) 0.3
Electrical Q (Qes) 0.319
Mechanical Q (Qms) 5.11
Equivalent Volume (Vas) 1.6 Liters
Diaphragm Area (Sd) 220.0 cm²
DC Resistance (Re) 6.2 Ω
Efficiency Bandwidth Product (EBP) 100.4
Linear Excursion (Xmax) 3.1 mm
Thermal Power (Pe) 30.0 W
Nominal Diameter 8.0"
Catalog Source Load Forge catalog (manufacturer datasheets and retailer listings)

Frequently Asked Questions

What is the recommended ported (bass reflex) box volume for SB Acoustics Satori MR16PNW-8 Bass-midwoofer?

A simple ported box is not recommended for SB Acoustics Satori MR16PNW-8 Bass-midwoofer: the textbook alignment (1.5 liters tuned to 39.7 Hz) needs a 245.4 cm port, and no nearby retune stays buildable without a bass hump. A sealed box, a passive radiator or a folded duct is the practical choice.

Can SB Acoustics Satori MR16PNW-8 Bass-midwoofer be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 0.35 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 76.9 Hz.

What port dimensions should be used for SB Acoustics Satori MR16PNW-8 Bass-midwoofer to avoid port chuffing?

A straight 5.0 cm port would need 245.4 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.

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SB Acoustics Satori MR16PNW-8 Bass-midwoofer Enclosure Card
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