Factory Buyouts EAS15SO359 2-1/2" X 5-1/4" Rectangular Full-Range Speaker 8 Ohm
Best box: 1.7 L sealed · Fc 248.5 Hz · F3 210.5 Hz
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Comparable 4.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Factory Buyouts EAS15SO359 2-1/2" X 5-1/4" Rectangular 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: 1.0 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Textbook Bass Reflex — not recommended (6.9 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 1.5 Liters |
| Tuning Frequency (Fb) | 149.3 Hz |
| F3 (-3 dB Cutoff) | 239.1 Hz |
| F6 / F10 Extension | 219.3 Hz / 191.8 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 14.0 cm |
| First Pipe Resonance | 1226.0 Hz |
| Estimated MOL @ F3 | 102.4 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 2.409 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 3.407; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 1.7 Liters |
| System Q (Qtc) | 3.407 (above Butterworth: Qtc cannot fall below Qts (2.41)) |
| System Resonance (Fc) | 248.5 Hz |
| F3 (-3 dB Cutoff) | 210.5 Hz |
| F6 / F10 Extension | 193.3 Hz / 171.3 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 175.7 Hz |
| Total Q (Qts) | 2.409 |
| Electrical Q (Qes) | 5.295 |
| Mechanical Q (Qms) | 4.42 |
| Equivalent Volume (Vas) | 1.7 Liters |
| Diaphragm Area (Sd) | 55.4 cm² |
| DC Resistance (Re) | 7.34 Ω |
| Efficiency Bandwidth Product (EBP) | 33.2 |
| Linear Excursion (Xmax) | 1.0 mm |
| Thermal Power (Pe) | 10.0 W |
| Nominal Diameter | 4.0" |
| 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 EAS15SO359 2-1/2" X 5-1/4" Rectangular Full-Range Speaker 8 Ohm?
A simple ported box is not recommended for Factory Buyouts EAS15SO359 2-1/2" X 5-1/4" Rectangular Full-Range Speaker 8 Ohm: the textbook alignment (1.5 liters tuned to 149.3 Hz) needs a 14.0 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 EAS15SO359 2-1/2" X 5-1/4" Rectangular Full-Range Speaker 8 Ohm be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 1.7 liters with a Qtc of 3.407 (above Butterworth: Qtc cannot fall below Qts (2.41)), the system exhibits an F3 of 210.5 Hz.
What port dimensions should be used for Factory Buyouts EAS15SO359 2-1/2" X 5-1/4" Rectangular Full-Range Speaker 8 Ohm to avoid port chuffing?
A straight 5.0 cm port would need 14.0 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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