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I fail to see the logic behind modifications for iPods. Companies who offer iPod modifications such as this http://redwineaudio.com/imod claim that their modifications "improves soundstage, base control and midrange" while failing to publish any useful specifications about the 'new and improved' dac. And if the improvements in the modified iPods are really that substantial, I'm sure they wouldn't have a problem passing a DBT vs a standard iPod?
The internal modifications for iPods are pretty straightforward and simple to understand, and the modification process does create an improvement. Basically, The signal is picked up directly from the DAC, routed through quality capacitors, and directly out of the iPod and into an external amplifier of your choice. This bypasses all of the insides of the iPod! You are basically picking up the pure signal from the DAC and hearing it, nothing more, nothing less.
Your quote of "new and improved dac" is a bit off..the DAC is not improved, replaced or anything else in this modification. Just the ANALOG signal is picked up from the DAC and sent right out of the iPod. An external amp must be used.
This "iMod" can actually be done with less than $5 worth of parts. $10 if you choose a premium "film" cap. A good soldering iron and a steady hand is all you need. There are members on this site (myself included) who can do these mods if you are curious...
The "external dacs" (which tend to be very high in price - partially due to the licence the companies must pay to Apple) actually extract the DIGITAL signal from the iPod and process the digital to analog conversion outside the iPod, so a different beast altogether. A valid argument could be had whether this external DAC's SQ is any different than the modified iPod plus external amp.
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The 'improvements' are usually one or more of the following:
- Sound staging is improved and is more 3 dimensional, the veil is lifted
- Increased resolution of detail
- Smoother mids
- Improved bass control and bass punch and extension
- Superior treble
- Increased warmth, less sterile sound
It sounds as if you are skeptical or doubting the difference of sound quality of iPod modifications or external DAC's. So are these your actual listening impressions...or? Maybe if you haven't heard firsthand, you should not be posting what the improvements "sound like". I'm not trying to be combative here, just for the sake of the conversation, we should stick to actual listening impressions.
By best descriptor of the modded iPod (not external DAC) is that of looking through a dirty vs. a clean window. Compared to a stock 5/5.5G iPod - There is a blacker background, more extended treble (not muffled and rolled off as stock) and better clarity around instruments/notes.