That is... if... you keep your Harbeths.
Given your preferences - if you want to try tubes, you might find you prefer the sound of the Proac D2's driven by the Line Magnetic 518i, or similar. That combination is closer to what you describe you prefer, especially in an apartment or condo - unless you're prepared to drive the Harbeths with a powerful SS amp.
Given your preferences - if you want to try tubes, you might find you prefer the sound of the Proac D2's driven by the Line Magnetic 518i, or similar. That combination is closer to what you describe you prefer, especially in an apartment or condo - unless you're prepared to drive the Harbeths with a powerful SS amp.