According to the designer all amplifiers sound the same too.
I can't really say for sure how long does it take for the speakers to break-in since I've tried half a dozen amps with the speakers in the first 6 months. Nonetheless I feel the character of the speaker changes very little with extended listening sessions(with the same amp). In this sense I believe the designer's views in the break in period for Harbeth speakers may be accurate. I believe 1-2 weeks should be more than sufficient. Any apparent changes after that would probably be minimal or subtle at best.
As for biwire vs single, I think this topic was covered at length on the user forum as well. I have used both and personally there is no difference. Currently I prefer the single wire to the biwired speaker cables, but then again the single wire matches the system better than the biwired version. As for which speaker cable, that would depend on the type of sound you are looking for. Personally I would follow Harbeth's advice and recommendation on the topic of speaker cables.
I can't really say for sure how long does it take for the speakers to break-in since I've tried half a dozen amps with the speakers in the first 6 months. Nonetheless I feel the character of the speaker changes very little with extended listening sessions(with the same amp). In this sense I believe the designer's views in the break in period for Harbeth speakers may be accurate. I believe 1-2 weeks should be more than sufficient. Any apparent changes after that would probably be minimal or subtle at best.
As for biwire vs single, I think this topic was covered at length on the user forum as well. I have used both and personally there is no difference. Currently I prefer the single wire to the biwired speaker cables, but then again the single wire matches the system better than the biwired version. As for which speaker cable, that would depend on the type of sound you are looking for. Personally I would follow Harbeth's advice and recommendation on the topic of speaker cables.