The 12" Line Array Speaker Design Guide provides a full bill of materials and measurement responses.
To achieve this, the 12-inch drivers and high-frequency (HF) compression drivers must be spaced closely enough to couple constructively. If the spacing between sound sources exceeds half the wavelength of the frequency being produced, the system will suffer from "combing" and destructive interference. Core Components of a 12-Inch Line Array Box
The physical offset between the 12-inch woofer and the HF driver must be corrected, often via DSP (Digital Signal Processing). Recommended Tools for Design