This Alpine RUX-KNOB remote subwoofer control knob is compatible with select Alpine amplifiers and allows you to easily make bass adjustments while you drive. Multiamplifier capability allows flexible use (phone cable splitter required; not included).
I have been using this for about 6 months now. It is very easy to use and the bestbuy installer placed this knob in a great spot. I kept my factory head unit and I wanted some extra bass so I added an Alpine sub in my trunk and this knob is essential so that I don't have to keep using the BASS setting on my headunit. I just simply turn the knob to min or max depending on how much bass the song actually has. It is great! Now no one will ever think i have a sub in my trunk and my Sub isnt over powering my speakers because thanks to this knob I have full control of how loud my sub is.