Presonus Eureka MODS.
Presonus does not put part numbers on the board so identification is by approx location.
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IC MoD:
- Replace the 2 socketed chips with better ic's (OPA627(My fav), OPA602, LT1357, or LME49710NA)

Capacitor MoD:
- Replace the 6 bipolar 47u capacitors with 470uf bipolar capacitors of the same voltage. (1 near the input, 2 near the compressor, 3 near the output)

Input transformer MoD:
- Replace the input transformer with a Jensen JT-11K8-APC transformer
Note: You will need to change your impedance selection resistors. Jensen will give you the info when you place the order for the transformer.

SMT MoD:
- If you're good at replacing surface mount parts and have the proper equipment then you could change all of the 14 pin MC33079 chips for LME49740NA, OPA404, or OPA4227 chips
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Disclaimer: I encourage people to DIY and I'm here in a informative role.
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Here are some pictures from some mods.
HERE!!! https://www.facebook.com/media/set/?set=a.566612136765790.1073741835.478520652241606&type=1&l=ff1646c994

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ModDefecation is about making equipment sound better, providing knowledge and support, repairing that awesome piece of gear, and custom builds. Send me you questions or Ideas.