What does the impedance curve of the Brodmann speaker look like? Does it have peaks and valleys? What is the output impedance of your Mastersound tube amp? If it is over 1 ohm then it will interact with any speaker having a non-flat impedance curve. The result will be a non-flat frequency response from the amp/speaker combination. Hardly what can be called "accurate" sound quality! Ohm's Law rules here!
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