... Latency: <0.5ms Frequency response: 20-20Khz 2.1 speaker system with amplifier1. Classic again, MDF & aluminium, built-in antenna ... 25 speaker structure, undertone stronger, output is 30W3. Black with red aluminium line, it is more fashionable.4. Volume ... Frequency response: 20-20KHzMagnetism resistance: yesVolumn Control: KnobLouderhailer: higher: 3 inch,4Ω,15W; Lower: 5 inch,4Ω, 30WLower controler: ...