Drivers driven by a 35W (LF) / 18W (HF) digital amplifier 5.2-inch Crimson woofer constructed of aramid fiber with mixed diaphragm impregnated with resin to enhance fiber bonding for higher rigidity 1-inch Urethane film laminated polyester fiber dome tweeter tuned with the back chamber for smooth high frequency sonics Digital Network Filter (FIR type) for dividing network - results in very accurate time alignment to deliver supreme sound positioning Unique Rotary Encoder plus LED indication with no aging quality deterioration 44 step level control by Volume/Trim adjustments +/-3dB per 0.3dB step HF level control and +/- 20 step LF roll off frequency adjustment Auto Standby / Auto Operation function for electric power saving Fade In function to gradually increase the output level when powering on