Audio System R 08 FLAT EVO 3-D4
Best box: 11.6 L bass reflex tuned to 49.8 Hz · F3 50.4 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 FLAT EVO 3-D4 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
- 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) | 11.6 Liters |
| Tuning Frequency (Fb) | 49.8 Hz |
| F3 (-3 dB Cutoff) | 50.4 Hz |
| F6 / F10 Extension | 44.2 Hz / 39.9 Hz |
| Port Inner Diameter ESTIMATED | Ø 6.8 cm |
| Port Physical Length | 33.0 cm |
| First Pipe Resonance | 522.0 Hz |
Recommended Sealed (Acoustic Suspension)
MAX TRANSIENT DAMPING| Net Box Volume (Vb) | 5.7 Liters |
| System Q (Qtc) | 0.707 (Butterworth) |
| System Resonance (Fc) | 89.1 Hz |
| F3 (-3 dB Cutoff) | 131.2 Hz |
| F6 / F10 Extension | 91.0 Hz / 62.7 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 59.0 Hz |
| Total Q (Qts) | 0.46 |
| Electrical Q (Qes) | 0.501 |
| Mechanical Q (Qms) | 5.58 |
| Equivalent Volume (Vas) | 7.7 Liters |
| Diaphragm Area (Sd) | 211.0 cm² |
| DC Resistance (Re) | 2.0 Ω |
| Efficiency Bandwidth Product (EBP) | 117.7 |
| 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 FLAT EVO 3-D4?
Load Forge's calculated alignment puts Audio System R 08 FLAT EVO 3-D4 in a 11.6 liter vented enclosure tuned to 49.8 Hz, reaching an F3 cutoff of approximately 50.4 Hz.
Can Audio System R 08 FLAT EVO 3-D4 be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 5.7 liters with a Qtc of 0.707 (Butterworth), the system exhibits an F3 of 131.2 Hz.
What port dimensions should be used for Audio System R 08 FLAT EVO 3-D4 to avoid port chuffing?
Xmax is not published for Audio System R 08 FLAT EVO 3-D4, so the port is an empirical estimate: a 6.8 cm diameter with a length of 33.0 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
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