My experience has been quite different. While my Bottlehead and Foreplay sound nice, they are pretty noisy as far as hum and buzz are concerned. It isn't like an old tube radio or anything like that, but with any speakers more efficient than about 90dB/W/M, you can hear them hum when no signal is present. They also make a sort of a spitting sound, a kind of a high frequency buzz.

If there was one thing I'd say bad about Bottlehead gear, it would be that it is noisy.

Wayne