Bassknob not included The product is Used Used means: the product was used and still in good working condition.It may have some scratches after previous installation and signs of wear.The product is working, tested by our technician and still under the limited warranty for a 3 month. Warranty doesn’t cover: Damage due to misuse of product Damage due to using the product outside of the recommended specifications. Damage due to negligence or abuse Improper installation (including professional installation) Damage due to clipping, overpowering and/or distortion (improper tuning) Model MFA-1.1500 Class D Number of the channels 1 Frequency response 10 - 250 Hz 1 Ohm RMS Power (14.4 V) 1500 W 2 Ohm RMS Power (14.4 V) 1000 W 4 Ohm RMS Power (14.4 V) 610 W Minimum permissible load on the channel 1 Ohm Low pass filter 50-250 Hz Crossover 24 dB/Oct Subsonic filter 10 - 55 Hz Input terminal 4 Ga Output terminal 8 Ga Working voltage 9 - 15 V Signal-to-noise ratio ≥ 160 dB Size (WxLxH) 10.7 x 6 x 2.1 inch