{
  "schema_version": "1.1",
  "id": "cs343-v1",
  "manufacturer": "Amperes Electronics",
  "model": "Amperes CS343",
  "license": "Catalogue data © Amperes Electronics — imported from public spec sheets.",
  "note": "4\" IP65-rated weatherproof ceiling speaker — aluminium rustproof grille. Directivity is approximated from the published 140° coverage.",
  "mount_type": "ceiling",
  "physical": {
    "weight_kg": 0.85,
    "dimensions_m": {
      "w": 0.14,
      "h": 0.13,
      "d": 0.14
    },
    "cutout_diameter_m": 0.12,
    "shape": "round",
    "driver_size_inches": 4
  },
  "electrical": {
    "nominal_impedance_ohm": 8,
    "line_voltage": "100V",
    "max_input_watts": 6,
    "max_spl_db": 97.8
  },
  "acoustic": {
    "sensitivity_db_1w_1m": 90,
    "frequency_range_hz": [
      150,
      18000
    ],
    "frequency_bands_hz": [
      125,
      250,
      500,
      1000,
      2000,
      4000,
      8000,
      16000
    ],
    "directivity_index_db": 4.8,
    "nominal_dispersion_deg": 140,
    "on_axis_response_db": {
      "125": -3,
      "250": 0,
      "500": 0.5,
      "1000": 0,
      "2000": 2,
      "4000": -1,
      "8000": -6,
      "16000": -20
    },
    "fr_fine_db": [
      [
        50,
        -25
      ],
      [
        63,
        -18
      ],
      [
        80,
        -10
      ],
      [
        100,
        -5
      ],
      [
        125,
        -3
      ],
      [
        160,
        -1
      ],
      [
        200,
        0
      ],
      [
        250,
        0
      ],
      [
        315,
        0.5
      ],
      [
        400,
        1
      ],
      [
        500,
        0.5
      ],
      [
        630,
        0
      ],
      [
        800,
        -0.5
      ],
      [
        1000,
        0
      ],
      [
        1250,
        0.5
      ],
      [
        1600,
        1.5
      ],
      [
        2000,
        2
      ],
      [
        2500,
        1.5
      ],
      [
        3150,
        0.5
      ],
      [
        4000,
        -1
      ],
      [
        5000,
        -2.5
      ],
      [
        6300,
        -4
      ],
      [
        8000,
        -6
      ],
      [
        10000,
        -9
      ],
      [
        12500,
        -14
      ],
      [
        16000,
        -20
      ],
      [
        20000,
        -28
      ]
    ],
    "csd_ms": {
      "125": 10,
      "250": 7,
      "500": 5,
      "1000": 4,
      "2000": 3.5,
      "4000": 3,
      "8000": 2.5,
      "16000": 2
    }
  },
  "placement": {
    "position_m": {
      "x": 0,
      "y": 0,
      "z": 3
    },
    "aim_deg": {
      "yaw": 0,
      "pitch": -90,
      "roll": 0
    }
  },
  "directivity": {
    "angular_resolution_deg": 30,
    "class_hint": "standard",
    "azimuth_deg": [
      -180,
      -150,
      -120,
      -90,
      -60,
      -30,
      0,
      30,
      60,
      90,
      120,
      150,
      180
    ],
    "elevation_deg": [
      -90,
      -60,
      -30,
      0,
      30,
      60,
      90
    ],
    "attenuation_db": {
      "1000": [
        [
          -23,
          -19.5,
          -15.5,
          -11.5,
          -7.5,
          -4.5,
          -3,
          -4.5,
          -7.5,
          -11.5,
          -15.5,
          -19.5,
          -23
        ],
        [
          -21.5,
          -18,
          -14,
          -10,
          -6,
          -3,
          -1.5,
          -3,
          -6,
          -10,
          -14,
          -18,
          -21.5
        ],
        [
          -20.5,
          -17,
          -13,
          -9,
          -5,
          -2,
          -0.5,
          -2,
          -5,
          -9,
          -13,
          -17,
          -20.5
        ],
        [
          -20,
          -16.5,
          -12.5,
          -8.5,
          -4.5,
          -1.5,
          0,
          -1.5,
          -4.5,
          -8.5,
          -12.5,
          -16.5,
          -20
        ],
        [
          -20.5,
          -17,
          -13,
          -9,
          -5,
          -2,
          -0.5,
          -2,
          -5,
          -9,
          -13,
          -17,
          -20.5
        ],
        [
          -21.5,
          -18,
          -14,
          -10,
          -6,
          -3,
          -1.5,
          -3,
          -6,
          -10,
          -14,
          -18,
          -21.5
        ],
        [
          -23,
          -19.5,
          -15.5,
          -11.5,
          -7.5,
          -4.5,
          -3,
          -4.5,
          -7.5,
          -11.5,
          -15.5,
          -19.5,
          -23
        ]
      ]
    }
  }
}