... , 32Ω- Front speaker: 2X40mm, 64Ω- Surround sound speaker: 2X30mm, 32Ω- Bass: 2X40mm, 8Ω- Pre frequency response :25-18000Hz- Surround sound Frequency ... response :100-18000Hz- Mid frequency response :100-18000Hz- Bass frequency response :20-160Hz- Microphone: Φ6.0mm, 2.2KΩ,-58dB ...