Neotera Audio UF-295-CBS
Best box: 25.0 L sealed · Fc 29.6 Hz · F3 23.8 Hz
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Comparable 11.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Neotera Audio UF-295-CBS 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 (20.0 L at 17.8 Hz) would need a 203.6 cm port; the recommendation is retuned to 40.0 L at 17.8 Hz so the port can be built.
- Port length (99.1 cm) exceeds a straight internal run; use an elbow bend, slotted vent or 3D folded duct to fit the enclosure.
Textbook Bass Reflex — not recommended (5.2 dB bass hump)
PORT NEEDS ELBOW / 3D| Net Box Volume (Vb) | 40.0 Liters |
| Tuning Frequency (Fb) | 17.8 Hz |
| F3 (-3 dB Cutoff) | 20.7 Hz |
| F6 / F10 Extension | 16.6 Hz / 12.4 Hz |
| Port Inner Diameter | Ø 7.5 cm |
| Port Physical Length | 99.1 cm |
| First Pipe Resonance | 174.0 Hz |
| Estimated MOL @ F3 | 111.2 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 1.45 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 2.051; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 25.0 Liters |
| System Q (Qtc) | 2.051 (above Butterworth: Qtc cannot fall below Qts (1.45)) |
| System Resonance (Fc) | 29.6 Hz |
| F3 (-3 dB Cutoff) | 23.8 Hz |
| F6 / F10 Extension | 21.2 Hz / 18.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 20.9 Hz |
| Total Q (Qts) | 1.45 |
| Electrical Q (Qes) | 2.135 |
| Mechanical Q (Qms) | 4.52 |
| Equivalent Volume (Vas) | 25.0 Liters |
| Diaphragm Area (Sd) | 394.0 cm² |
| DC Resistance (Re) | 3.8 Ω |
| Efficiency Bandwidth Product (EBP) | 9.8 |
| Linear Excursion (Xmax) | 16.5 mm |
| Thermal Power (Pe) | N/A W |
| Nominal Diameter | 11.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Neotera Audio UF-295-CBS?
A simple ported box is not recommended for Neotera Audio UF-295-CBS: the textbook alignment (40.0 liters tuned to 17.8 Hz) needs a 99.1 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 Neotera Audio UF-295-CBS be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 25.0 liters with a Qtc of 2.051 (above Butterworth: Qtc cannot fall below Qts (1.45)), the system exhibits an F3 of 23.8 Hz.
What port dimensions should be used for Neotera Audio UF-295-CBS to avoid port chuffing?
A straight 7.5 cm port would need 99.1 cm of length, which does not fit a practical cabinet. Use a passive radiator or a folded/3D duct instead of a straight tube.
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