... 21(H)mmModel: SL-BT-1201 (1ch, 2-way passive crossover)1) Terminal board integrated2) Frequency response: 1,000Hz, 5,000Hz3) X ... 100(H)mmModel: SL-BT-1206 (1ch, 2-way passive crossover)1) Terminal board integrated2) Frequency response: 1,000Hz, 12,500Hz3) X ... 75(H)mmModel: SL-BT-1301 (1ch, 3-way passive crossover)1) Terminal board integrated2) Frequency response: 2,000Hz, 6,000Hz3) X ...