All,
Careful listening tests of burned-in 4G vs 5G/5.5G iMods (playing identical WAV files, using Apple Firmware) has confirmed with me that the 5G/5.5G with ALO iMod Dock Cable is my favorite sounding unit. In order to try and keep it as fair as possible, I am also using an ALO cable with the 4G iMod (that uses the same wire and RCA plugs at the ALO iMod Dock cable).
Here are a few notes on my findings:
I have found that the 5.5G iMod (I have an 80GB here) offers slightly enhanced bass response. There is some added weight and "attack" to the bass, but the bass quality is still just as well-defined at the 4G.
I have also found that the midrange with the 5.5G iMod is a little bit more clear, and offers a tad more fullness (especially with vocals) that to me is a little more engaging than the 4G iMod.
The top-end on both units is very close... both detailed but never bright/etchy. Its all about tonal balance, and both the 4G and 5G/5.5G iMods offer this in spades!
It is important to note that although I do believe that the 5.5G iMod is superior sounding to the 4G iMod, the 5.5G does not crush the 4G by any means... in other words, the improvements are subtle (but easy enough to notice in a well-resolving system). Also, the 4G does not seem to offer any aspect to the sound that is superior to the 5G/5.5G.
I am getting ready to visit family for the weekend and will not be back until Monday, so for now this is all I have time to post. I apologize for the delay in posting, but I've been so busy modding 5.5G iPods and doing so many other RWA-related things... but these iMod are coming out great! I have a process in place to mod the 5.5G iPods, and am also using a new internal wire for all 5G/5.5G iMods (it is a special-made wire by Cardas and it is fantastic... thanks to Ken for getting it to me!).
Best regards,
Vinnie