What is the recommended ported (bass reflex) box volume for SB Acoustics MR16P-8?

According to electroacoustic alignment calculations, SB Acoustics MR16P-8 performs optimally in a 21.0 liter vented enclosure tuned to 39.7 Hz, reaching an F3 cutoff of approximately 42.9 Hz.

Can SB Acoustics MR16P-8 be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 9.7 liters with a Qtc of 0.707, the system exhibits an F3 of 76.0 Hz with tight transient response and natural roll-off.

What port dimensions should be used for SB Acoustics MR16P-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 14.2 cm is recommended.

Reflex Optimized

SB Acoustics MR16P-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

189.95 EUR

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⚠️ Engineering Notice for Builders

Limited linear excursion (Xmax: 3.1 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.

Recommended Bass Reflex (Vented)

OPTIMIZED EXTENSION

Net Box Volume (Vb)	21.0 Liters
Tuning Frequency (Fb)	39.7 Hz
F3 (-3 dB Cutoff)	42.9 Hz
F6 / F10 Extension	36.9 Hz / 31.9 Hz
Port Inner Diameter	Ø 5.0 cm
Port Physical Length	14.2 cm
First Pipe Resonance	1211.0 Hz
Estimated MOL @ F3	100.0 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	9.7 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	73.2 Hz
F3 (-3 dB Cutoff)	76.0 Hz
F6 / F10 Extension	57.2 Hz / 43.1 Hz
Air Spring Linearity	High (Zero port compression)

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Verified 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)	44.3 Liters
Diaphragm Area (Sd)	119.0 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	6.5"
Catalog Source	Manufacturer Official Datasheet

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[b]SB Acoustics MR16P-8[/b] — 21.0L Bass Reflex tuned to 39.7Hz (F3: 42.9Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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