Just a note regarding the Esoteric C-03, they have released the upgraded model C-03x. You may find some original C-03 preamps still available but they should be priced accordingly.
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I have a Levinson 432 amp and Sonus Faber Cremona speakers. I had a Classe 65 preamp and wanted to upgrade. It had a slight amount of digital harshness in the treble. I tried a 326 and the sound was pleasant but had no pizazz. I also think of Levinson of slightly laid back and the combo of the 432 and the 326 was a little too laid back. especially with my speakers. I eventually went to a Cary SLP-05 which had the tube sweetness, but still have plenty of jump. Before deciding on a 326 I would look at various tube pre-amps, like the Cary, Conrad Johnson and others. The normal disclaimer - YMMV depending on other components, notable the speakers.