Summary: I bought this from B&H for the same price offered here Amazon but it was cheaper for the shipping. Anyways,to make this review short, if you are true audiophile I don't recommend this. It will reduce the amount of upper trebles and make the midrange muddy, basically this will make your headphones/iems sound signature like Beats.
Summary: I listen to a lot of house, bass-heavy electronica, pop, and jazz via my laptop and a pair of Audio-Technica ATH-A700 headphones and the Digizoid ZO 2 Personal Subwoofer is the audio equivalent of viewing a picture in full, saturated color vs. black & white. The bass gets as deep and full as I want without sounding muddy: detail is maintained across the entire frequency range. Battery life is excellent and the controls intuitive.
Summary: After receiving the ZO² and getting it properly set up*, I tested it with my Sennheiser HD555s on the train sequence in the movie Super 8. Wow, what a difference; I could actually feel the carnage! Good show, Digizoid. *Digizoid's technician, Paul, was a huge help in getting an audible "hiss" eliminated. It turns out that the issue was on my end.
Summary: Perfect if you are listening to pop music and Rap music. The bass is clear and has a large quantity. I usually play my music with the green bass setting. I listen to pop music and some classical music. Compare to my Fiio e10, which is a desktop DAC, ZO 2 got more bass but muddy music. Overall for this size, it's perfect.
Summary: Go get one now! This little device turned my sterile sounding AKG K550's into a monster. There's not much to say because I have no idea how "SmartVector" tech works, but I has saved me from ditching my headphones and sacrificing the wide headstage and crisp mids/highs for a bass can. BOOM.
Summary: This is an updated version of what I posted on the impressions thread located here. I changed a few things because I've now been using the ZO2 for a week, extensively.
I'm running the ZO2 through all of my headphones. Here's a breakdown.
Before ZO2 -- These things are clear and clean, but are very bass-light. I can't really listen to them. I was very disappointed when I got them, considering how well liked they are. I bought AKG K44s to replace them.
Summary: I'll start with the bad... The unit has a cheap feel to it. The plastic seems chintzy. My input headphone jack takes some real force to put the 3.5 into, which makes me worry that it's not long for this world. Fortunately, I can just leave the plug in this side (the headphone jack works just fine). All the cords that come with it feel cheap. There is slight background noise as well...not audible if there's any music going on, but it's there.
Summary: It all started when I was trying to find a headphone amplifier to go along with my Audio Technica ATH-M50's (which don't require an amp at all). I was perfectly content with the M50's by themselves, but I wanted a bit more bass. The search began and I was extremely close to pulling the trigger on the FiiO amplifier. I kept browsing forum posts and decided to get this. From the minute I powered this on and plugged it in, I fell in love.
Summary: This sound processor has been my best purchase in recent memory....it has tremendously improved my quality of life with no exaggeration....I sit in an office all day and this little box has enabled me to enjoy music like I did when I was in high school. Coupled with bass music from the 90's on rhapsody with a creative xfi soundcard and Sony xb-500's or skullcandy titans with eq v'd +xfi@85 % and bass dial at 3 o'clock.