Over the last few days, we have duly noted all of your comments/criticisms to identify exactly what needed to be remedied. To say the least, the two main points (hiss and line out incompatibility) very much surprised us, as they were not present in any of our prototype versions. Please understand that these issues were not intentionally allowed. Therefore Paul, ZO's creator and the inventor of our SmartVektor technology, has been working feverishly to resolve these issues. At this point in time, he has found the source of the problem (both issues are being caused by the same fault), has determined a means of resolving it, and we intend to fix each and every ZO from our first production run. We value the trust you placed in our company through your pre-orders, and we will not rest until our product sounds the way we intended the ZO2 to sound to each and every customer.