Dayton Audio CE81PF-8
Best box: 1.5 L bass reflex tuned to 90.8 Hz · F3 98.4 Hz
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Comparable 3.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Dayton Audio CE81PF-8 does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
⚠️ Engineering Notice for Builders
- The textbook alignment (1.5 L at 82.5 Hz) would need a 54.1 cm port; the recommendation is retuned to 1.5 L at 90.8 Hz so the port can be built.
- Limited linear excursion (Xmax: 2.7 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) | 1.5 Liters |
| Tuning Frequency (Fb) | 90.8 Hz |
| F3 (-3 dB Cutoff) | 98.4 Hz |
| F6 / F10 Extension | 81.6 Hz / 68.4 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 44.0 cm |
| First Pipe Resonance | 391.0 Hz |
| Estimated MOL @ F3 | 95.6 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.81 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.146; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 1.0 Liters |
| System Q (Qtc) | 1.146 (above Butterworth: Qtc cannot fall below Qts (0.81)) |
| System Resonance (Fc) | 137.2 Hz |
| F3 (-3 dB Cutoff) | 115.0 Hz |
| F6 / F10 Extension | 96.2 Hz / 78.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 97.0 Hz |
| Total Q (Qts) | 0.81 |
| Electrical Q (Qes) | 0.902 |
| Mechanical Q (Qms) | 7.92 |
| Equivalent Volume (Vas) | 1.0 Liters |
| Diaphragm Area (Sd) | 28.3 cm² |
| DC Resistance (Re) | 6.7 Ω |
| Efficiency Bandwidth Product (EBP) | 107.5 |
| Linear Excursion (Xmax) | 2.7 mm |
| Thermal Power (Pe) | 15.0 W |
| Nominal Diameter | 3.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Dayton Audio CE81PF-8?
Load Forge's calculated alignment puts Dayton Audio CE81PF-8 in a 1.5 liter vented enclosure tuned to 90.8 Hz, reaching an F3 cutoff of approximately 98.4 Hz.
Can Dayton Audio CE81PF-8 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 1.0 liters with a Qtc of 1.146 (above Butterworth: Qtc cannot fall below Qts (0.81)), the system exhibits an F3 of 115.0 Hz.
What port dimensions should be used for Dayton Audio CE81PF-8 to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 44.0 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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