Point-source geometry
LF and HF share one acoustic axis for coherent arrival and focused imaging.
15-INCH FIELD-COIL COAXIAL DRIVER
XH-CX15
Magnetic control you can tune.
XH-CX15 combines a 15-inch paper-cone low-frequency section, a coaxial 51 mm Al-Mg high-frequency diaphragm and an externally powered field coil. Change the excitation voltage to tune Qts—and tune the enclosure alignment with it.
0.379Qts at 148 V
33.4 HzMeasured Fs
95.60 dBCalculated Lp
20.069 TmMeasured Bl
Actual XH-CX15 · isolated product photograph
FIELD-COIL CONTROL
One driver, more than one alignment.
A conventional permanent magnet fixes the motor strength at the factory. The XH-CX15 field coil makes it adjustable: raise the DC excitation to increase magnetic control and lower Qts; reduce it when a softer electrical damping target is desired.
Adjustable motor strength
Measured Qts changes from 0.619 at 80 V to 0.351 at 200 V.
51 mm Al-Mg HF
A central waveguide couples the high-frequency diaphragm directly through the cone axis.
Built for exploration
Suitable for custom QB3 systems, prototypes and voltage-dependent acoustic research.
MEASURED VOLTAGE RESPONSE
Most of the useful Qts change happens by 140–150 V.
The response is deliberately non-linear. Qts drops quickly at lower voltage, then the curve flattens. Around 148 V, the measured Qts is 0.379—a practical starting point for the QB3 reference below.
Qts (total quality factor)
140–150 V working area
!200 V is a measurement point, not a continuous-use recommendation. Set voltage only with an isolated, regulated DC supply and follow the supplied safety instructions.
STARTING-POINT ENCLOSURE
A practical QB3 prototype around 200 L net.
Using the current 148 V parameters as a first-pass basis, start near 200 litres net and tune to 34–35 Hz. Build, measure impedance and near-field response, then trim port length for the final driver and damping arrangement.
≈200 LTarget net volume
34–35 HzTarget tuning
2 × Ø100 mmRound ports
≈120 mmInitial port length
Simple cabinet reference · 21 mm panel
Internal starting dimensions: W560 × H850 × D450 mm (gross 214 L). Deduct driver, ports and bracing to reach the net target. Dimensions are a prototype reference, not a finished production drawing.
560 mm
850 mm
QB3
≈200 LNET
≈200 LNET
450 mm
ACTUAL PRODUCT
The driver, from diaphragm to field coil.
Complete product views are isolated for a clean presentation. The close-up preserves the original photograph to show the coaxial high-frequency waveguide and diaphragm texture.
MEASURED AT 148 V
Core electro-acoustic parameters.
Nominal diameter15 in / 389 mm overall
DC resistance Re9.48 Ω
Resonance Fs33.4 Hz
Total Qts0.379
Electrical Qes0.389
Mechanical Qms14.834
Equivalent volume Vas248.65 L
Force factor Bl20.069 Tm
Moving mass Mms78.87 g
Compliance Cms0.289 mm/N
Calculated reference Lp95.60 dB
HF diaphragm51 mm Al-Mg alloy
Cut-out / bolt circleØ356 / Ø369 mm, 8 × Ø7 mm
Mounting depth / weight256 mm / 8.75 kg
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