I had the Robert Koda K15 and upgraded it to the K15-EX. The cases are basically identical, and the fit and finish is top notch for both.
But the K15-EX is a significant improvement over the K15 in a number of ways including richness, upper end extension, musicality, dynamics, coherence and realism to name a few.
There has been unanimous consent among those who have heard the K15EX in my room, with both Magico Q7mkIIs and Aries Cerat Symphonias, that the K15-EX is simply an amazing sounding preamp.
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Do you have both Magico Q7 and Symphonia? How do they compare?