"Must be efficient enough to be driven with 20-30+ watts (possibly tubes)"
When you say "possibly tubes", does that mean that you haven't yet acquired the amp that you're intending to use with the new speakers? If that's the case, why lock yourself into 20-30 watts(and what does the "+" mean in "30+"). That could severely limits your speaker choices and IMO, knowing whether we're talking tube or SS makes a difference.
When you say "possibly tubes", does that mean that you haven't yet acquired the amp that you're intending to use with the new speakers? If that's the case, why lock yourself into 20-30 watts(and what does the "+" mean in "30+"). That could severely limits your speaker choices and IMO, knowing whether we're talking tube or SS makes a difference.