I am actually selling my SoundStream XXX-10000D......the reason I went with the DD Z1 instead is because it is more efficient.... I will be competing in a class where only 1 battery is allowed and the car will be off......well, when the SS draws up to 565amp per burp....that made up my mind, LOL I am selling the SS for $800 plus shipping. I have only used it for testing purposes.