http://www.head-fi.org/forums/showthread.php?t=240110
The word was always that:
1. The only iPod worth modding is the 4G because of the Wolfson DAC
2. Not enough space in other iPods
So, anything to add, Vinnie? aa
Hi Procreate,
The cat is out of the bag... the 5G/5.5G (iPod Video models) iMods are coming!
I am aiming to be ready to offer these by the end of this month. I will keep you all updated and will be updating the iMod website.
The 5G also uses a Wolfson dac. The main problem was that there is not enough space inside of the iPod Video models for the upgraded signal coupling caps that I install as part of the iMod.
I've been working with Ken Ball of ALO Audio and we determined that these caps can actually be installed inside of the dock connector plug that is featured in his ALO dock cables. So for the upcoming 5G iMod, I will take the line-out signal directly off of the internal Wolfson DAC and hard wire it to the dock connector. Just like the 4G iMod that I've been doing, this will bypass the stock opamp output stages, stock signal coupling caps before and after the op-amp, the tiny board traces, and other components in the signal path (resistors, inductors, etc.). The custom ALO cable will contain the upgraded signal coupling caps inside of the dock connector plug of the cable. He will offer this cable terminated with RCA plugs, or with a 1/8" stereo mini plug. I believe he is working on a few different versions as well.
Regarding sound quality, at the HE2007 we compared the new 5G iMod to the 4G iMod playing the same WAV file. These were connected to a RWA Signature 30 amp, and driving the Omega Max Hemp speakers.
The 5G iMod barely had any burn-in time on the BG caps (under 10 hours) and the 4G iMod was very well broken-in. Even without the burn-in, the 5G iMod was just good as the 4G, but appeared to have even better bass attack! I am really excited to see how good this 5G will sound with more use! It has the potential to sound quite a bit better as the BG caps burn-in.

The 5G/5.5G iMod will require that I modify the unit as described above, AND you must use the custom ALO 5G iMod cable (with installed BG caps). Otherwise, there will be DC offset voltage on the line-out pins of the dock connector. This cable will be sold by ALO Audio. I will not be making these cables. ALO will be selling fully modded 5G units with his custom cable. For those that already own the 5G unit, they can be sent to me for the 5G iMod and you can order the cable from Ken.
The good news is that the stock headphone output is preserved

The other good news is that since the upcoming larger hard drives (120GB) will only be made with ZIF connectors, these will be able to be installed in the 5G iMods. aa
The 5G also features gapless playback (for those who find this to be very important).
The not-so-good news for me is that performing the mod in the 5G iPod is much more time-consuming and difficult (very risky!). Unfortunately, this also means that the price of the 5G iMod will be more than that of the 4G iMod

More to follow...
Thank you for all your interest!
Vinnie