{
  "schema_version": "1.1",
  "id": "line-array-element-v1",
  "manufacturer": "AuraLAB Open",
  "model": "Line-array element (single box)",
  "license": "CC-BY-4.0",
  "note": "Single cabinet of a K2 / J8 / STM class line array. Inherently narrow vertical (±10°) from two flanking LF cones, plus shaped horizontal via waveguide. A single element is LF-limited — full range only when 4+ elements are flown together (coherent summation below ~500 Hz).",
  "physical": {
    "weight_kg": 18.0,
    "dimensions_m": { "w": 1.20, "h": 0.42, "d": 0.45 }
  },
  "electrical": {
    "nominal_impedance_ohm": 8,
    "max_input_watts": 500,
    "max_spl_db": 132
  },
  "acoustic": {
    "sensitivity_db_1w_1m": 100.0,
    "frequency_range_hz": [60, 18000],
    "frequency_bands_hz": [125, 250, 500, 1000, 2000, 4000, 8000, 16000],
    "directivity_index_db": 12.0,
    "on_axis_response_db": {
      "125": -11.0,
      "250":  -6.0,
      "500":  -1.5,
      "1000":  0.0,
      "2000":  0.5,
      "4000": -0.5,
      "8000": -2.0
    },
    "_fr_fine_note": "Single-element on-axis response — LF is severely reduced (pre-array summation). Flattens only once 4+ elements couple below ~500 Hz. Waveguide pushes 2–4 kHz slightly up; HF extends cleanly to 15 kHz.",
    "fr_fine_db": [
      [  40, -22 ], [  50, -18 ], [  63, -14 ], [  80, -12 ],
      [ 100, -11 ], [ 125, -11 ], [ 160, -10 ], [ 200,  -9 ],
      [ 250,  -7 ], [ 315,  -5 ], [ 400,  -4 ], [ 500,  -2 ],
      [ 630,  -1 ], [ 800, -0.5], [1000,   0 ], [1250,  0.5],
      [1600,  0.5], [2000,  1.0], [2500,  1.5], [3150,  1.5],
      [4000,  1.0], [5000,  0.5], [6300,   0 ], [8000, -0.5],
      [10000, -1.0], [12500, -2.0], [16000, -5.0], [20000, -10.0]
    ],
    "csd_ms": {
      "125":  18.0,
      "250":  11.0,
      "500":   6.5,
      "1000":  4.8,
      "2000":  3.8,
      "4000":  3.0,
      "8000":  2.5
    }
  },
  "placement": {
    "position_m": { "x": 0.0, "y": 4.0, "z": 0.0 },
    "aim_deg":    { "yaw": 0, "pitch": -5, "roll": 0 }
  },
  "directivity": {
    "angular_resolution_deg": 30,
    "class_hint": "line-element",
    "azimuth_deg":   [-180, -150, -120, -90, -60, -30, 0, 30, 60, 90, 120, 150, 180],
    "elevation_deg": [-90, -60, -30, 0, 30, 60, 90],
    "note": "Single line-array element. On-axis ±55° H × ±10° V main beam at 1 kHz. Off-beam falls 25+ dB; rear rejection ~−36 dB.",
    "attenuation_db": {
      "1000": [
        [-42, -42, -42, -42, -42, -42, -42, -42, -42, -42, -42, -42, -42],
        [-40, -40, -38, -36, -34, -32, -32, -32, -34, -36, -38, -40, -40],
        [-38, -36, -34, -32, -30, -28, -28, -28, -30, -32, -34, -36, -38],
        [-36, -33, -28, -20,  -8,  -1,   0,  -1,  -8, -20, -28, -33, -36],
        [-38, -36, -34, -32, -30, -28, -28, -28, -30, -32, -34, -36, -38],
        [-40, -40, -38, -36, -34, -32, -32, -32, -34, -36, -38, -40, -40],
        [-42, -42, -42, -42, -42, -42, -42, -42, -42, -42, -42, -42, -42]
      ]
    }
  }
}