I just ordered a pair of Sennheiser HD 428s as a cheap pair for higher SQ and more bass over my HD 201s but the thing is it seems even with more bass these don't have balanced extended bass like the HD 438s. I'll explain what I hear in the HD 201s: treble stands out obviously, the guitar sounds more "out there" and not as full. I find metal much more enjoyable on my CX 300-IIs which have a lot of bass, maybe too much though. Comparing the two with "Scream" by Avenged Sevenfold the CX 300-IIs over power all the mids and highs but the 201s are a little weak on the bass. I guess any thing near the middle of these two guys would be fine. I just feel like I would be missing out on the balanced more natural sound of the HD 438s if I kept the HD 428s. Should I not open the 428s and return them and save more money for the 438s or would the 428s sound good for me? The 428s and 438s have similar response down to 100hz, and that is where the 438s continue to stay balanced while the 428s drop off. I'm guessing that the bass guitar extends below 100hz so there would be a large difference between the two. If metal will sound as it should, I'm fine with the 428s as I only paid $50 but if I really will benefit from paying $30 more for the 438s please share your wisdom! I can't open the 428s unless I know I'm going to keep them.