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Cowon d2 hardware mod (Z'ning mod)

post #1 of 5
Thread Starter 

We all know that cowon can put out some amazing players, but they all suffer from the same problem(at least the newer models), bass roll off.

this mod removes the small 220uf caps and replaces them with 470uf caps. my version adds some 25ohm resistors as well, feel free to experiment with your own combinations.

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sorry for the blur pic but this was the only one i could find. credits anythingbutipod.com

the 220uf caps are the ones circled in white.

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there is no place for the larger caps, so after removing them, we soldered thin wire extensions for the cap mod. thin wires will fit better because the caps are located under the screen. thicker wires will not allow the screen to snap close to the pcb board.

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modifying the casing for the new caps

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and finally the end product

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FR curve generated from RMAA

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Original before mod(credit dfkt)                   After mod. Typo on the entry, the purple curve should be the control unloaded one.


Edited by davtse - 11/25/12 at 11:40pm
post #2 of 5
I honestly don't know what that graph means, but I can take a pretty accurate guess and say you improved your player by a whole heck of a lot. I am pretty new to the whole circuit board thing, but what are the odds of taking a 40 dollar cheapo music player and modding it to be an audiophile music player?
post #3 of 5
Thread Starter 
To be honest, the cowons use pretty decent dacs(wolfson) and amplifiers in their players. Their one fault would be that either due to space constraint or just to save manufacturing costs, they use some pretty small value capacitors, which in the case of the d2 results in massive bass rolloff and congestion.
The graphs just show how the bass response has improved post-mod and with different IEMs. Pre-mod when paired with the jh16s, the bass was bloated and a lot of the sub bass was missing.
post #4 of 5
Thread Starter 

Just had a break through today.

complete bassrolloff fix with rockbox + mod.
 

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post #5 of 5

Funny how there's so little replies, I think the mod is very interesting.

 

May I ask a few noob questions?

  1. What do the resistors do?
  2. What happens if I use bigger caps? (I could borrow some off an old video card.)
  3. What if I take polymer or ceramic caps? Those could be pretty small.
  4. What's the Rockbox mod you mentioned? :)

Edited by hoichi - 6/27/13 at 2:48pm
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