Audio System R 08 EVO
Best box: 10.8 L bass reflex tuned to 46.0 Hz · F3 54.2 Hz
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Comparable 8.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Audio System R 08 EVO 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 (10.8 L at 40.0 Hz) would need a 58.1 cm port; the recommendation is retuned to 10.8 L at 46.0 Hz so the port can be built.
- Xmax is not published, so the port size is an empirical estimate (area ≥ 12 in² per ft³ of net volume, minimum by driver size), not a displacement calculation. Check air velocity in Load Forge Studio.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 10.8 Liters |
| Tuning Frequency (Fb) | 46.0 Hz |
| F3 (-3 dB Cutoff) | 54.2 Hz |
| F6 / F10 Extension | 43.4 Hz / 36.0 Hz |
| Port Inner Diameter ESTIMATED | Ø 6.8 cm |
| Port Physical Length | 42.8 cm |
| First Pipe Resonance | 402.0 Hz |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 4.7 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 73.1 Hz |
| F3 (-3 dB Cutoff) | 87.0 Hz |
| F6 / F10 Extension | 69.7 Hz / 54.7 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 39.9 Hz |
| Total Q (Qts) | 0.38 |
| Electrical Q (Qes) | 0.433 |
| Mechanical Q (Qms) | 3.1 |
| Equivalent Volume (Vas) | 11.6 Liters |
| Diaphragm Area (Sd) | 215.0 cm² |
| DC Resistance (Re) | 2.0 Ω |
| Efficiency Bandwidth Product (EBP) | 92.1 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | N/A 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 Audio System R 08 EVO?
Load Forge's calculated alignment puts Audio System R 08 EVO in a 10.8 liter vented enclosure tuned to 46.0 Hz, reaching an F3 cutoff of approximately 54.2 Hz.
Can Audio System R 08 EVO be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 4.7 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 87.0 Hz.
What port dimensions should be used for Audio System R 08 EVO to avoid port chuffing?
Xmax is not published for Audio System R 08 EVO, so the port is an empirical estimate: a 6.8 cm diameter with a length of 42.8 cm (area at least 12 in² per ft³ of net volume). Check the air velocity at your power level in 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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