Intuitively you’d think that the Sonist is the better speaker match for the Had amplifier due to its specifications. The Silverline Prelude apparently must present a gentle and easy load in order for this amplifier to excel to such an extent. It will be interesting to see if swapping resistors in the Sonist makes an appreciable improvement. The Had amplifier must possess a pretty respectable power supply and output transformer for it to preform this well.
Charles
Charles