What is the recommended ported (bass reflex) box volume for Dayton Audio CE78PF-4?

According to electroacoustic alignment calculations, Dayton Audio CE78PF-4 performs optimally in a 1.5 liter vented enclosure tuned to 85.0 Hz, reaching an F3 cutoff of approximately 111.2 Hz.

Can Dayton Audio CE78PF-4 be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 4.6 liters with a Qtc of 1.107, the system exhibits an F3 of 93.5 Hz with tight transient response and natural roll-off.

What port dimensions should be used for Dayton Audio CE78PF-4 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 50.7 cm is recommended.

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Dayton Audio CE78PF-4

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

12.95 EUR

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⚠️ Engineering Notice for Builders

Port length (50.7 cm) is long; consider an elbow bend, slotted vent, or passive radiator to avoid box collision.
Limited linear excursion (Xmax: 1.4 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)	1.5 Liters
Tuning Frequency (Fb)	85.0 Hz
F3 (-3 dB Cutoff)	111.2 Hz
F6 / F10 Extension	92.5 Hz / 67.6 Hz
Port Inner Diameter	Ø 5.0 cm
Port Physical Length	50.7 cm
First Pipe Resonance	339.0 Hz
Estimated MOL @ F3	93.1 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	4.6 Liters
System Q (Qtc)	1.107 (Butterworth Q=0.707)
System Resonance (Fc)	110.2 Hz
F3 (-3 dB Cutoff)	93.5 Hz
F6 / F10 Extension	78.2 Hz / 63.4 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	100.0 Hz
Total Q (Qts)	0.99
Electrical Q (Qes)	1.327
Mechanical Q (Qms)	3.9

Equivalent Volume (Vas)	1.1 Liters
Diaphragm Area (Sd)	30.2 cm²
DC Resistance (Re)	3.7 Ω
Efficiency Bandwidth Product (EBP)	75.4

Linear Excursion (Xmax)	1.4 mm
Thermal Power (Pe)	10.0 W
Nominal Diameter	3.0"
Catalog Source	Manufacturer Official Datasheet

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[b]Dayton Audio CE78PF-4[/b] — 1.5L Bass Reflex tuned to 85.0Hz (F3: 111.2Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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