Coast Buyouts 1208PB-088A 3" x 5" 5W Paper Cone Speaker 8 Ohm
Best box: 4.5 L bass reflex tuned to 111.1 Hz · F3 126.5 Hz
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Comparable 3.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Coast Buyouts 1208PB-088A 3" x 5" 5W Paper Cone 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
- The textbook alignment (1.5 L at 123.4 Hz) would need a 22.2 cm port; the recommendation is retuned to 4.5 L at 111.1 Hz so the port can be built.
- Limited linear excursion (Xmax: 1.0 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) | 4.5 Liters |
| Tuning Frequency (Fb) | 111.1 Hz |
| F3 (-3 dB Cutoff) | 126.5 Hz |
| F6 / F10 Extension | 92.4 Hz / 85.6 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 7.0 cm |
| First Pipe Resonance | 2450.0 Hz |
| Estimated MOL @ F3 | 97.3 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 1.589 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 2.247; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 1.1 Liters |
| System Q (Qtc) | 2.247 (above Butterworth: Qtc cannot fall below Qts (1.59)) |
| System Resonance (Fc) | 205.3 Hz |
| F3 (-3 dB Cutoff) | 174.1 Hz |
| F6 / F10 Extension | 155.8 Hz / 134.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 145.2 Hz |
| Total Q (Qts) | 1.589 |
| Electrical Q (Qes) | 2.093 |
| Mechanical Q (Qms) | 6.59 |
| Equivalent Volume (Vas) | 1.1 Liters |
| Diaphragm Area (Sd) | 40.7 cm² |
| DC Resistance (Re) | 7.28 Ω |
| Efficiency Bandwidth Product (EBP) | 69.4 |
| Linear Excursion (Xmax) | 1.0 mm |
| Thermal Power (Pe) | 5.0 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 Coast Buyouts 1208PB-088A 3" x 5" 5W Paper Cone Speaker 8 Ohm?
Load Forge's calculated alignment puts Coast Buyouts 1208PB-088A 3" x 5" 5W Paper Cone Speaker 8 Ohm in a 4.5 liter vented enclosure tuned to 111.1 Hz, reaching an F3 cutoff of approximately 126.5 Hz.
Can Coast Buyouts 1208PB-088A 3" x 5" 5W Paper Cone Speaker 8 Ohm be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 1.1 liters with a Qtc of 2.247 (above Butterworth: Qtc cannot fall below Qts (1.59)), the system exhibits an F3 of 174.1 Hz.
What port dimensions should be used for Coast Buyouts 1208PB-088A 3" x 5" 5W Paper Cone Speaker 8 Ohm to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 7.0 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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