Peerless PLS-65F25AL02-08 2-1/2" Aluminum Full-Range Speaker
Best box: 1.5 L bass reflex tuned to 92.8 Hz · F3 88.2 Hz
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Comparable 2.5" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Peerless PLS-65F25AL02-08 2-1/2" Aluminum Full-Range 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
- The textbook alignment (1.5 L at 88.4 Hz) would need a 46.6 cm port; the recommendation is retuned to 1.5 L at 92.8 Hz so the port can be built.
- Limited linear excursion (Xmax: 2.6 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) | 92.8 Hz |
| F3 (-3 dB Cutoff) | 88.2 Hz |
| F6 / F10 Extension | 77.5 Hz / 68.9 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 42.0 cm |
| First Pipe Resonance | 410.0 Hz |
| Estimated MOL @ F3 | 92.8 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.7 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 0.99; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 0.85 Liters |
| System Q (Qtc) | 0.99 (above Butterworth) |
| System Resonance (Fc) | 147.1 Hz |
| F3 (-3 dB Cutoff) | 123.2 Hz |
| F6 / F10 Extension | 100.7 Hz / 80.1 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 104.0 Hz |
| Total Q (Qts) | 0.7 |
| Electrical Q (Qes) | 0.82 |
| Mechanical Q (Qms) | 4.8 |
| Equivalent Volume (Vas) | 0.8 Liters |
| Diaphragm Area (Sd) | 22.1 cm² |
| DC Resistance (Re) | 6.1 Ω |
| Efficiency Bandwidth Product (EBP) | 126.9 |
| Linear Excursion (Xmax) | 2.6 mm |
| Thermal Power (Pe) | 10.0 W |
| Nominal Diameter | 2.5" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Peerless PLS-65F25AL02-08 2-1/2" Aluminum Full-Range Speaker?
Load Forge's calculated alignment puts Peerless PLS-65F25AL02-08 2-1/2" Aluminum Full-Range Speaker in a 1.5 liter vented enclosure tuned to 92.8 Hz, reaching an F3 cutoff of approximately 88.2 Hz.
Can Peerless PLS-65F25AL02-08 2-1/2" Aluminum Full-Range Speaker be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 0.85 liters with a Qtc of 0.99 (above Butterworth), the system exhibits an F3 of 123.2 Hz.
What port dimensions should be used for Peerless PLS-65F25AL02-08 2-1/2" Aluminum Full-Range Speaker to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 42.0 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
Embed this design card on DIYAudio, AVSForum, Reddit, or Facebook. It shows the calculated F3, MOL (when the power rating is published) and box parameters.
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