Factory Buyouts EAS15S03F9 2-1/2" X 5-1/4" Full Range Speaker 8 Ohm
Best box: 1.6 L sealed · Fc 242.5 Hz · F3 217.5 Hz
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Comparable 4.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Factory Buyouts EAS15S03F9 2-1/2" X 5-1/4" Full Range Speaker 8 Ohm 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: 0.55 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Textbook Bass Reflex — not recommended (7.1 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 1.5 Liters |
| Tuning Frequency (Fb) | 145.8 Hz |
| F3 (-3 dB Cutoff) | 243.2 Hz |
| F6 / F10 Extension | 222.3 Hz / 194.0 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 14.9 cm |
| First Pipe Resonance | 1156.0 Hz |
| Estimated MOL @ F3 | 96.9 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 2.149 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 3.039; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 1.6 Liters |
| System Q (Qtc) | 3.039 (above Butterworth: Qtc cannot fall below Qts (2.15)) |
| System Resonance (Fc) | 242.5 Hz |
| F3 (-3 dB Cutoff) | 217.5 Hz |
| F6 / F10 Extension | 199.0 Hz / 175.5 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 171.5 Hz |
| Total Q (Qts) | 2.149 |
| Electrical Q (Qes) | 5.216 |
| Mechanical Q (Qms) | 3.65 |
| Equivalent Volume (Vas) | 1.6 Liters |
| Diaphragm Area (Sd) | 60.0 cm² |
| DC Resistance (Re) | 7.42 Ω |
| Efficiency Bandwidth Product (EBP) | 32.9 |
| Linear Excursion (Xmax) | 0.6 mm |
| Thermal Power (Pe) | 3.0 W |
| Nominal Diameter | 4.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Factory Buyouts EAS15S03F9 2-1/2" X 5-1/4" Full Range Speaker 8 Ohm?
A simple ported box is not recommended for Factory Buyouts EAS15S03F9 2-1/2" X 5-1/4" Full Range Speaker 8 Ohm: the textbook alignment (1.5 liters tuned to 145.8 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 Factory Buyouts EAS15S03F9 2-1/2" X 5-1/4" Full Range Speaker 8 Ohm be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 1.6 liters with a Qtc of 3.039 (above Butterworth: Qtc cannot fall below Qts (2.15)), the system exhibits an F3 of 217.5 Hz.
What port dimensions should be used for Factory Buyouts EAS15S03F9 2-1/2" X 5-1/4" Full Range Speaker 8 Ohm 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.
Shareable Acoustic Card for Forums & Social Media
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