Guys, I can't find any discussion regarding tablet as ICE that can answer me. Well, thinking of getting a cheapo tablet, in range of RM 2xx - 4xx as a replacement of player in my car. My friend use 3.5mm to 3.5mm from his Aigopad to his player and from the player to his pre-amp and subwoofer. I don't know how is the exact connection as I'm new to card. BTW, I only drive Saga 1.6 SE.
The reason I want to make android tab as player is IMO most tab have better display in resolution and color. And they are cheaper. Plus I don't need to change the player or install the LCD that might void the warranty. Not to mention a lot of stolen player in a car. Please note that I'm still new in ICE and I don't even know the right sequence. Please correct my mistake.

Does the player determine the AUDIO quality? I mean from cheap to expensive? And from this brand to that brand? My current plan is:
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a) Tablet -> aux -> stock player -> pre-amp, amp, speaker.
b) Stock player -> pre-amp, amp, speaker.
I wonder a) will cause the sound become worse, better or maintain. I have a USB DAC. And I'm thinking of:
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c) Tablet -> USB DAC -> aux -> stock player -> the rest...
And I wonder if USB DAC in car will improve the sound. Well, in computer and mobile case the DAC really improve the output and way better than on-board soundcard.
I used to heard a saying "an mp3 sound worse than a CD". Well, in my tab my collection are FLAC and 320kbps mp3. In other word, they are high quality ripped. Will playing from a tab sound worse than a CD? What I think is mp3 sound sucks than CD when the mp3 are low quality ripped and combined with a sucky modulator.
Thanks...