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I am wondering if there is a clear upgrade from the EE Minimax dac.  I am listening to LCD2-s through a beta 22.  With tube rolling, cables, etc.  I have tamed the upper mids of the minimax to acceptable levels.  I am very sensitive to the frequency range.  I am wondering if it makes sense to try the Isabellina or perhaps a used  Pefectwave, Minerva or Berkeley.  While I am especially in search of sweet highs, I also want to maintain weight and extension in the low frequencies due to a small hearing loss.  Any thoughts about these sources relative to the Minimax?