What is the recommended ported (bass reflex) box volume for Peerless by Tymphany TC5FC81-04?

According to electroacoustic alignment calculations, Peerless by Tymphany TC5FC81-04 performs optimally in a 1.5 liter vented enclosure tuned to 174.0 Hz, reaching an F3 cutoff of approximately 163.6 Hz.

Can Peerless by Tymphany TC5FC81-04 be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 0.1 liters with a Qtc of 0.707, the system exhibits an F3 of 164.2 Hz with tight transient response and natural roll-off.

What port dimensions should be used for Peerless by Tymphany TC5FC81-04 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 9.4 cm is recommended.

Reflex Optimized

Peerless by Tymphany TC5FC81-04

Complete Thiele/Small parameters, optimized ported (bass reflex) and sealed enclosure designs, F3/F6/F10 cutoffs, and vent turbulence analysis calculated by Load Forge.

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⚠️ Engineering Notice for Builders

Limited linear excursion (Xmax: 1.12 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)	174.0 Hz
F3 (-3 dB Cutoff)	163.6 Hz
F6 / F10 Extension	156.9 Hz / 148.1 Hz
Port Inner Diameter	Ø 5.0 cm
Port Physical Length	9.4 cm
First Pipe Resonance	1833.0 Hz
Estimated MOL @ F3	92.5 dB SPL

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Recommended Sealed (Acoustic Suspension)

MAX TRANSIENT DAMPING

Net Box Volume (Vb)	0.1 Liters
System Q (Qtc)	0.707 (Butterworth Q=0.707)
System Resonance (Fc)	309.8 Hz
F3 (-3 dB Cutoff)	164.2 Hz
F6 / F10 Extension	136.6 Hz / 107.7 Hz
Air Spring Linearity	High (Zero port compression)

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Verified Thiele/Small Parameters

Resonance (Fs)	230.0 Hz
Total Q (Qts)	0.52
Electrical Q (Qes)	0.584
Mechanical Q (Qms)	4.77

Equivalent Volume (Vas)	0.1 Liters
Diaphragm Area (Sd)	7.7 cm²
DC Resistance (Re)	3.1 Ω
Efficiency Bandwidth Product (EBP)	394.1

Linear Excursion (Xmax)	1.1 mm
Thermal Power (Pe)	5.0 W
Nominal Diameter	1.5"
Catalog Source	Manufacturer Official Datasheet

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Peerless by Tymphany TC5FC81-04 Enclosure Card

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[url=https://loadforge.io/drivers/peerless-by-tymphany-tc5fc81-04][img]https://loadforge.io/api/v1/card/peerless-by-tymphany-tc5fc81-04.svg[/img][/url]
[b]Peerless by Tymphany TC5FC81-04[/b] — 1.5L Bass Reflex tuned to 174.0Hz (F3: 163.6Hz). Designed with [url=https://loadforge.io]Load Forge[/url].

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