One day this past summer I was in Target and saw these on sale. I hadn't heard anything about them and I expected they'd be junk, but they were $10 on sale so I grabbed a pair, to use with my MB Air. They sounded pretty mediocre without any equalization. I suspect that part of the problem was that the impedance isn't very high compared to the output impedance of the 'phone jack on that model of MB Air. But I downloaded one of the cheap-as-dirt sound apps for the Mac, and discovered something I had not expected. Even though they are bass-weak in their natural response, they are capable of pumping out colossal bass with the help of EQ. According to Amir's distortion graph the distortion should have been unbearable in low frequency. And I recall that after listening for a little while, I turned the deep bass down again because the distortion was bothersome. But then with the next song, I'd turn it back up again. Then with the next song, back down again. It was annoying to have to readjusting the deep bass level with each different song. But that's how it was, because with a track where the deep bass wasn't very loud, I would turn up the deep bass, and with a track where the deep bass was loud, I'd turn it back down because of the bothersome distortion. I think they would best be used with a headphone amp that has a bass control with an exceptionally low cutover frequency. This wouldn't eliminate the need for the EQ, but it would give a convenient way to adjust bass level as needed, so that the deep bass EQ could be set somewhere in the middle, louder but not too much louder, then left alone. I eventually picked up a different pair that I had prior experience with, and stopped using the ZX110. I gave them away, and then later I wondered why I gave them away. But it doesn't matter, because they cost less than a haircut. What I actually need to do is find a better EQ app for the Mac, i.e., better than that Boom piece of garbage.