SB Audience NERO-18OBN500D
Best box: 662.0 L sealed · Fc 31.1 Hz · F3 24.2 Hz
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Comparable 18.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the SB Audience NERO-18OBN500D 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
- Large enclosure volume (529.6 L) requires extensive internal matrix bracing to prevent panel resonance.
Textbook Bass Reflex — not recommended (4.7 dB bass hump)
PORT BUILDABLE| Net Box Volume (Vb) | 529.6 Liters |
| Tuning Frequency (Fb) | 18.7 Hz |
| F3 (-3 dB Cutoff) | 26.7 Hz |
| F6 / F10 Extension | 22.8 Hz / 18.0 Hz |
| Port Inner Diameter | Ø 15.0 cm |
| Port Physical Length | 17.9 cm |
| First Pipe Resonance | 962.0 Hz |
| Estimated MOL @ F3 | 118.2 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 0.9 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 1.273; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 662.0 Liters |
| System Q (Qtc) | 1.273 (above Butterworth: Qtc cannot fall below Qts (0.90)) |
| System Resonance (Fc) | 31.1 Hz |
| F3 (-3 dB Cutoff) | 24.2 Hz |
| F6 / F10 Extension | 20.6 Hz / 17.0 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 22.0 Hz |
| Total Q (Qts) | 0.9 |
| Electrical Q (Qes) | 1.042 |
| Mechanical Q (Qms) | 6.6 |
| Equivalent Volume (Vas) | 662.0 Liters |
| Diaphragm Area (Sd) | 1244.0 cm² |
| DC Resistance (Re) | 5.34 Ω |
| Efficiency Bandwidth Product (EBP) | 21.1 |
| Linear Excursion (Xmax) | 16.0 mm |
| Thermal Power (Pe) | 500.0 W |
| Nominal Diameter | 18.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for SB Audience NERO-18OBN500D?
A simple ported box is not recommended for SB Audience NERO-18OBN500D: the textbook alignment (529.6 liters tuned to 18.7 Hz) needs a 17.9 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 SB Audience NERO-18OBN500D be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 662.0 liters with a Qtc of 1.273 (above Butterworth: Qtc cannot fall below Qts (0.90)), the system exhibits an F3 of 24.2 Hz.
What port dimensions should be used for SB Audience NERO-18OBN500D to avoid port chuffing?
A straight 15.0 cm port would need 17.9 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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