... Latency: <0.5ms Frequency response: 20-20Khz 2.1 speaker system with amplifier1. Classic again, MDF & aluminium, built-in antenna, shortest ... 5.25 speaker structure, undertone stronger, output is 30W3. Black with red aluminium line, it is more fashionable.4. Volume part ... , according to your request to adjust the sound, moreover, it show the blue light.5. Back part, clear cables hole ...