3.5" Woofer with Kevlar cone 1" Tweeter with silk cone Frequency range: 80 - 20,000 Hz Sound pressure level: 100 dBA SPL (peak) Inputs: TRS jacks (L/R symmetrical) RCA pair (L/R) Treble control Bass control (-6 to +6dB each) Front-side AUX input (stereo mini jack) for smartphone etc. Front-side headphone jack (stereo mini jack) Front-side volume control with on/off switch and status LED Class AB power amplifier (2x 25 W sine) Shielded against HF interference Switch-on delay and output current limiter Overheating protection and subsonic filter