Audio System R 12 FA EVO
Best box: 27.0 L sealed · Fc 52.3 Hz · F3 43.8 Hz
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Comparable 12.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Audio System R 12 FA 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
- 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.
- Straight vent would be 103.4 cm long: not physically buildable as a simple tube. Use a passive radiator, a folded slot port or model a 3D folded duct in Load Forge Studio.
Textbook Bass Reflex — not recommended
PORT NOT BUILDABLE| Net Box Volume (Vb) | 21.6 Liters |
| Tuning Frequency (Fb) | 31.4 Hz |
| F3 (-3 dB Cutoff) | 49.5 Hz |
| F6 / F10 Extension | 43.1 Hz / 35.1 Hz |
| Port Inner Diameter ESTIMATED | Ø 10.0 cm |
| Port Physical Length | 103.4 cm |
| First Pipe Resonance | 166.0 Hz |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 1.02 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.442; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 27.0 Liters |
| System Q (Qtc) | 1.442 (above Butterworth: Qtc cannot fall below Qts (1.02)) |
| System Resonance (Fc) | 52.3 Hz |
| F3 (-3 dB Cutoff) | 43.8 Hz |
| F6 / F10 Extension | 38.1 Hz / 31.8 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 37.0 Hz |
| Total Q (Qts) | 1.02 |
| Electrical Q (Qes) | 1.138 |
| Mechanical Q (Qms) | 9.85 |
| Equivalent Volume (Vas) | 27.0 Liters |
| Diaphragm Area (Sd) | 498.0 cm² |
| DC Resistance (Re) | 3.3 Ω |
| Efficiency Bandwidth Product (EBP) | 32.5 |
| Linear Excursion (Xmax) | N/A mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 12.0" |
| 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 12 FA EVO?
A simple ported box is not recommended for Audio System R 12 FA EVO: the textbook alignment (21.6 liters tuned to 31.4 Hz) needs a 103.4 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 Audio System R 12 FA EVO be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 27.0 liters with a Qtc of 1.442 (above Butterworth: Qtc cannot fall below Qts (1.02)), the system exhibits an F3 of 43.8 Hz.
What port dimensions should be used for Audio System R 12 FA EVO to avoid port chuffing?
A straight 10.0 cm port would need 103.4 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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