Dayton Audio CE140-30S-8 Micro Speaker
Best box: 5.0 L sealed · Fc 148.5 Hz · F3 129.9 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Dayton Audio CE140-30S-8 Micro Speaker 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
- Limited linear excursion (Xmax: 2.0 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Textbook Bass Reflex — not recommended (5.5 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 4.0 Liters |
| Tuning Frequency (Fb) | 89.2 Hz |
| F3 (-3 dB Cutoff) | 151.2 Hz |
| F6 / F10 Extension | 139.7 Hz / 123.6 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 14.9 cm |
| First Pipe Resonance | 1153.0 Hz |
| Estimated MOL @ F3 | 100.0 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 2.76 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 3.903; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 5.0 Liters |
| System Q (Qtc) | 3.903 (above Butterworth: Qtc cannot fall below Qts (2.76)) |
| System Resonance (Fc) | 148.5 Hz |
| F3 (-3 dB Cutoff) | 129.9 Hz |
| F6 / F10 Extension | 120.2 Hz / 107.4 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 105.0 Hz |
| Total Q (Qts) | 2.76 |
| Electrical Q (Qes) | 6.812 |
| Mechanical Q (Qms) | 4.64 |
| Equivalent Volume (Vas) | 5.0 Liters |
| Diaphragm Area (Sd) | 220.0 cm² |
| DC Resistance (Re) | 7.75 Ω |
| Efficiency Bandwidth Product (EBP) | 15.4 |
| Linear Excursion (Xmax) | 2.0 mm |
| Thermal Power (Pe) | 10.0 W |
| Nominal Diameter | 8.0" |
| 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 CE140-30S-8 Micro Speaker?
A simple ported box is not recommended for Dayton Audio CE140-30S-8 Micro Speaker: the textbook alignment (4.0 liters tuned to 89.2 Hz) needs a 14.9 cm port, and no nearby retune stays buildable without a bass hump. A sealed box, a passive radiator or a folded duct is the practical choice.
Can Dayton Audio CE140-30S-8 Micro Speaker be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 5.0 liters with a Qtc of 3.903 (above Butterworth: Qtc cannot fall below Qts (2.76)), the system exhibits an F3 of 129.9 Hz.
What port dimensions should be used for Dayton Audio CE140-30S-8 Micro Speaker to avoid port chuffing?
A straight 5.0 cm port would need 14.9 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
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