HD 668B are far away from real studio monitor. Just listen Sennheiser HD600 and compare, words here are useless. Superlux  HD660 lack in bass indeed. Superlux HD330 are much better headphones. Both had the same driver and construction, but HD 330 are not closed. Difference is big in the bass...

  I burned in the 668B around 4 weeks, every day and after that I can listen. On first week I was shocked how they sound. I wondered how could this ever be able to listen but with time they become better and better. After 6-7 months they do not change in sound anymore. Still to much problems...

I had these headphones 2 years and HD681. For the price are great, but there are several big cons in sound. I gave them to my friend for his birthday. When compare them to Superlux HD330 and Sennheiser HD598 and Sennheiser HD600 the problems are too obvious.  I have all these headphones and...

Quote: Yes, I read several review for 681 and his tinny sounding. That's why I choose HD-668B. But even 668B is bright for me. High are also sharp. HD-330 are everything but not tinny or sharp. I love this headphones. Every day when I listening music I am appraise high quality of the sound...

Yes, Beyerlux is much better than Superlux  .  The name is dummy in my opinion, and I didn't expect much from such name. I read in another forum that they compare hd-330 with Beyerdynamic 880, the guy wrote that main difference is slight small soundstage. I never hear Beyer 880 and can't confirm...

Quote:   Well, I tested all headphones and with Marantz PM-68 Amplifier too, and HD-330 sound more louder than HD-668B. They are 150 Ohm compare to 56 Ohm in HD-668B, in theory 56 Ohm must drive more easily, but HD-330 150 Ohm are more sensitive headphones and they sound louder. After 100...

The soundstage is very good. Wide, deeper and more correct soundstage compare to HD-668B. The sound is little more forward than HD-668B.  The sound stage from HD-668B are little more wider and flat, but too much wider and that cause lack of focus in music. HD-330 are better.

Hi All    I will try to write correctly because my English is not perfect. Before 6 days finally I got the new Superlux HD-330 150 Ohm.   How I tested and Equipment.   I am also an owner of HD-668B. I had them from 4 months. I have also Zennnheiser HD-530 MARKII 300 Ohm, AKG K141...