Well this changes the game considerably for me then. I went out and bought the Denon AH-C351 again and am convinced these are the IEMs for me. So if I am correct, its their sound signature which I am in love with. Now my question to you, or anyone else for that matter, is how do I proceed with upgrading? How do I get a technically improved product within the same sound signature? Does this mean that I stick with Denon products? Even though I believe the 351 is a foster product...
Any advice and/or thoughts would be greatly appreciated.
Well first off, I'd like to mention that I don't think the FX67 is technically hampered just because it's cheap. There are parts of the sound that simply are just better than other IEMs I've tried. Other parts such as bass, are extremely subjective to judge. The Golds are known to have deep extension, great impact, and a smooth texture. The FX67 might not extend as low, have as much impact, or be as smooth, but that doesn't mean they score lower. Do you see what I mean? Mainly, it's about what sounds good to you as apposed to advances in technology and sound quality. That said, I do appreciate good sound quality, or else I wouldn't have my HE-500. But it really has to be a sound that you like in order for you to really appreciate it. The DT880 is a high end headphone that has excellent technical qualities, yet I didn't like the sound. The AD900 is less technically advanced, yet it had a sound I appreciated much more. Based on a 50/50 between sound quality and sound presentation, the presentation is the most important thing one will usually look for. When you can find something that sounds to your liking AND has excellent sound quality is when you hit the sweet spot.
You don't have to stick with Denon just because you like the IEM, as they all will sound different. You just have to pick what you like about the sound, and search for a headphone that matches those specifications. But you really just have to try around, and see what your ears tell you. Because I wouldn't have thought in a million years that a $20 IEM would beat everything else I've tried regardless of price. Technically? Pretty impressive for the price. Presentation? Absolutely amazing. Making it a winner in my book.