Vented Specialist

Seas Excel C18EN002_A-E0060-08_06

Best box: 3.0 L bass reflex tuned to 83.3 Hz · F3 115.0 Hz

Predicted SPL response of the Seas Excel C18EN002_A-E0060-08_06 in the recommended 3.0 L bass reflex box versus the alternative — open it in the simulator Open and tweak this box live ↗

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⚠️ Engineering Notice for Builders

  • Limited linear excursion (Xmax: 3.0 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.

Recommended Bass Reflex (Vented)

PORT BUILDABLE
Net Box Volume (Vb) 3.0 Liters
Tuning Frequency (Fb) 83.3 Hz
F3 (-3 dB Cutoff) 115.0 Hz
F6 / F10 Extension 92.9 Hz / 71.2 Hz
Port Inner Diameter Ø 5.0 cm
Port Physical Length 24.7 cm
First Pipe Resonance 696.0 Hz
Estimated MOL @ F3 110.9 dB SPL
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Sealed (Acoustic Suspension) — compromise

SUITS INFINITE / OPEN BAFFLE

With Qts 0.62 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.877; for a flat response this driver is better used on an infinite (IB) or open baffle.

Net Box Volume (Vb) 3.7 Liters
System Q (Qtc) 0.877 (above Butterworth)
System Resonance (Fc) 138.6 Hz
F3 (-3 dB Cutoff) 122.2 Hz
F6 / F10 Extension 97.6 Hz / 76.4 Hz
Air Spring Linearity High (Zero port compression)
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Thiele/Small Parameters

Resonance (Fs) 98.0 Hz
Total Q (Qts) 0.62
Electrical Q (Qes) 0.87
Mechanical Q (Qms) 2.16
Equivalent Volume (Vas) 3.7 Liters
Diaphragm Area (Sd) 131.0 cm²
DC Resistance (Re) 6.2 Ω
Efficiency Bandwidth Product (EBP) 112.7
Linear Excursion (Xmax) 3.0 mm
Thermal Power (Pe) 250.0 W
Nominal Diameter 6.5"
Catalog Source Load Forge catalog (manufacturer datasheets and retailer listings)

Frequently Asked Questions

What is the recommended ported (bass reflex) box volume for Seas Excel C18EN002_A-E0060-08_06?

Load Forge's calculated alignment puts Seas Excel C18EN002_A-E0060-08_06 in a 3.0 liter vented enclosure tuned to 83.3 Hz, reaching an F3 cutoff of approximately 115.0 Hz.

Can Seas Excel C18EN002_A-E0060-08_06 be used in a sealed box?

Yes. In a sealed (acoustic suspension) enclosure of 3.7 liters with a Qtc of 0.877 (above Butterworth), the system exhibits an F3 of 122.2 Hz.

What port dimensions should be used for Seas Excel C18EN002_A-E0060-08_06 to avoid port chuffing?

Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 24.7 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.

Shareable Acoustic Card for Forums & Social Media

Embed this design card on DIYAudio, AVSForum, Reddit, or Facebook. It shows the calculated F3, MOL (when the power rating is published) and box parameters.

Seas Excel C18EN002_A-E0060-08_06 Enclosure Card
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