Model: 2024 , The reason why SINGTRONIC KS-6000Pro Professional 6000Watts (3000W + 3000W) Vocalist Karaoke Speaker is crystal clear sound and ground shaking so good that is because KS-6000Pro are equipped with 2" High Frequency Compression Driver.  The Compressor Driver are the speakers that produce sharp mids and highs so that the overall vocal is much more crystal clear and natural. SINGTRONIC KS-6000Pro are also equipped with 15" Bass Super Woofer (also called bottom end) with Low Frequency Response from 16Hz ~ 256KHz and Sensitivity: 35Hz ~ 19.5KHz with Max SPL: 135dB will bring any karaoke system with ground shaking Boom Bass and can vibrate your entire body if they are turning up loud enough.