You do not need a sub with the ZU Essence. Sell your sub and put the money into a great low wattage Class A Amp like a Pass Labs XA 30.5. The ZU go way down and deep, tight and super fast with the right Amp. You could even get the new Pass labs INT 30A which is the same amp as the XA 30.5 but with a killer Preamp built in. The
