This is the first time I have used a stand alone subwoofer with the JBL MK2. I don't know why I waited so long! It adds that missing thump or kick that no 10 inch Column Array can match. Of course matching with the great Bose Sub1 would be the ultimate but I wanted to keep the price of the total rig closer to $2,000. Here is the link to the RCF Ayra Pro10 sub which at $450 is the same price as the KRK and I believe higher performing - https://www.rcf.it/en_US/products/product-detail/ayra-pro10-sub/1422004 The link to the Battery Source which doesn't break a sweat running the KRK Subwoofer - https://www.amazon.com/gp/product/B07CYMCLDN/ref=ox_sc_act_title_5?smid=ATW4RRWB3JMSM&psc=1