I have a TARAMPS Big Boss 3 Smart Amp (The black edition) with the stock bass knob for sale. These units are absolutely brand new, never used, just open box. This "Smart Amp" automatically adjusts itself for 0.5 ohms - 2 ohm loads, and boasts a 3000RMS output for your subwoofers. I bought this amplifier and bass knob, took them out of the box, then realized that 3000RMS watts was way to much for me and my set up. Paid over $500 recently, going for over $472 plus tax on Amazon. Comes with everything that it did when I got, including the stickers, minus the plastic wrap I took off the amplifier. My loss is your gain $300 obo. cash only