Buy 2 used Jeff Rowland Model 12 monoblocks. Class AB. 350W into 4 ohms. Least expensive option for the best result.
Easy peasy. You win!
How do I know? That's what I have into my 4 ohm, 92.5dB Mezzo Utopia's.
Easy peasy. You win!
How do I know? That's what I have into my 4 ohm, 92.5dB Mezzo Utopia's.