Our lowest distortion and musical system, the Ultra 15 package has the highest WAF factor with a compact, ultra musical sounding subwoofer (the ULS-15 MK2) with our award winning HB/HC-1 MK2 or CCB-8 speakers that would delight any serious audiophiles with taut musical bass down to 20 Hz. Suitable for rooms up to 4,500 cu. ft. Add another ULS-15 MK2 for larger rooms.