B&C Speakers 12HCX76
B&C 12HCX76: 12″ coaxial driver with a shared neodymium motor, 3″ HF section with titanium diaphragm and 60° × 40° coverage.
Current · Last checked: 2026-11-13
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General data
Link to section “General data”- Type
- Coaxial driver
- Nominal size
- 12″
- Nominal impedance
- 8 Ω Manufacturer
- Minimum impedance
- 6.7 Ω Manufacturer
- Sensitivity
- 99 dB 2.83 V, distance not stated Value of the LF section. B&C states the voltage (2.83 V) but no measurement distance. Manufacturer
- Frequency range
- 45 Hz – 18,000 Hz Manufacturer
- Voice coil Ø
- 76 mm Manufacturer
- Winding height
- 16.5 mm Manufacturer
- Gap depth
- 8 mm Manufacturer
- Flux density
- 1.15 T Manufacturer
- Magnet
- neodymium (ring, shared magnet for LF and HF)
- Weight
- 5.3 kg Manufacturer
- Baffle cut-out Ø
- 283 mm Manufacturer
- Overall diameter
- 315 mm Manufacturer
- Mounting depth
- 168 mm Manufacturer
- Displacement
- not available
- Recommended enclosure volume
- not available
The LF and HF sections are 8 Ω each. Sensitivity for both is referenced to 2.83 V; the 8 dB difference between the LF and HF sections has to be compensated by the crossover. The Thiele-Small parameters apply to the LF section; the manufacturer does not state Cms or Xmax.
Coverage angle according to the manufacturer 60° × 40° (“60°x40° nominal coverage”, table: “Dispersion Angle 60°”, referenced to the –6 dB points). The datasheet does not give a recommended enclosure volume.
What can this driver do?
Link to section “What can this driver do?”Simulation from the datasheet values above. The suggestions are calculated, not stated by the manufacturer.
The EBP is above 130 – by the rule of thumb, this points to a vented enclosure and also makes the driver interesting for horns. This is based on an EBP of 210.
- Net volume
- 28 L
- Tuning frequency
- 87 Hz
- F3 (−3 dB)
- 85.5 Hz
- F6 (−6 dB)
- 77.1 Hz
- F10 (−10 dB)
- 68.1 Hz
- Sensitivity (2.83 V / 1 m)
- 100.6 dB
- Max. SPL at 85.5 Hz
- 123 dB
- Max. SPL at 171 Hz
- 126.1 dB
- Ports
- 2 × 125 mm
- Port area for 17 m/s
- 236 cm²
- Max. port velocity
- 16.3 m/s
- Port length
- 25.4 cm
- at 350 W
- Xmax is not known: excursion and maximum SPL cannot be limited.
- Power into 8 Ω (nominal impedance of the wiring).
- Flattest alignment: lowest F3 without the response rising more than 0.25 dB above the passband level or dropping more than 0.5 dB at 2 × F3.
- The 17 m/s limit (about 5 % of the speed of sound) is a common rule of thumb against port noise, not a standard. Rounded port ends allow higher values.
- Lumped-element Thiele/Small model, Half space, 1 m, chamber losses QL 7, Le as a plain inductance, no room influence. At high levels (heating, non-linear Bl and Cms) real results are lower.
Thiele-Small parameters
Link to section “Thiele-Small parameters”Small-signal parameters as stated by the manufacturer. They change with temperature and level.
Plausibility check
Link to section “Plausibility check”We recalculate dependent values from the datasheet. We flag deviations above 3 %.
| Check | Formula | Datasheet | Calculated | Result |
|---|---|---|---|---|
| Qts from Qes and Qms | Qts = Qes · Qms / (Qes + Qms) | 0.19 | 0.195 | consistent |
| EBP from Fs and Qes | EBP = Fs / Qes | 210 | 210 | consistent |
Power handling
Link to section “Power handling”- Continuous power (standard not stated)350 W
- Programme power700 W
B&C tests the LF section for two hours with pink noise in the range Fs to 10 × Fs, and the HF section for two hours with pink noise from the recommended crossover frequency to 20 kHz – each free-air mounted and referenced to the minimum impedance. Programme power (“Continuous Power Handling”) is defined as 3 dB above rated power handling – i.e. a calculated figure.
High-frequency section
Link to section “High-frequency section”A coaxial driver combines two transducers in one basket. The values here apply only to the high-frequency section – its sensitivity and power handling must not be combined with those of the low-frequency section.
- Throat diameter
- 33 mm
- Nominal impedance
- 8 Ω
- Minimum impedance
- 8 Ω
- Sensitivity
- 107 dB
- Frequency range
- not available
- Recommended crossover
- 1,200 Hz
- Voice coil Ø
- 75 mm
- Diaphragm
- titanium
- Continuous power (standard not stated) (HF)80 W
- Programme power (HF)160 W
B&C does not give a separate frequency range for the HF section; the 45 Hz to 18 kHz applies to the whole driver. The recommended crossover point is 1.2 kHz with a high-pass of 12 dB/octave or steeper. The voice coil is aluminium (0.14 mH, 1.9 T).
Build plans with this driver
Link to section “Build plans with this driver”Sources
Link to section “Sources”-
Tier A · primary source
B&C Speakers 12HCX76 (8 Ω) – Datasheet (PDF) and Product page
B&C Speakers S.p.A. · accessed on 13 November 2026
The datasheet (7 pages) is generated by the manufacturer’s website via the “Download → Datasheet” button on the product page https://www.bcspeakers.com/en/products/coaxial/12/8/12HCX76. Values and footnotes match the product page. The document contains no issue date or revision.
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Tier A · primary source
B&C Speakers · 9 November 2009 (Date from file metadata) · accessed on 13 September 2026
File on the older B&C domain (old.bcspeakers.com/media/W1siZiIsIjIwMTkvMDUvMDkv…), whose TLS certificate had expired as of 2026-09-13. The current overview page is therefore linked instead.