Michael Fremer

What makes a phono cartridge worth $3500 or $4000? Pride of ownership? Snob appeal? Sound? Tracking ability? Exotic materials? Styling? Labor cost for skilled artisans? Special ether? Cool wooden box? All of the above?

The French-made Kora line has been in and out of American distribution over the past decade. It's currently imported by Norman AV of Aventura, Florida. With the window of opportunity open again, I decided to listen to Kora's modestly priced hybrid integrated amplifier, the Explorer 150SB ($2030).

Sometimes you have to make peace with a loudspeaker. You have to accept it on its own terms rather than ask it to bend to your sonic wishes, or to be something it's not. This is especially true when you're auditioning a seemingly endless succession of them, as I have this year. Like beauty-pageant contestants parading across the stage, all different-looking yet all enticing in one way or another, each speaker I've listened to of late has sounded different from the rest, and each has had a unique combination of strengths and weaknesses—yet each has been sufficiently "in the pocket" to paint a credible musical picture. Nonetheless, some required more bending on my part than did others, in order for me to believe the musical portraits they were attempting to create.

Class-A amplifiers have a well-deserved reputation for being power guzzlers that run hot enough to burn fingers. They're inherently inefficient because their output devices conduct full current at all times, and much of that current is dissipated as heat—requiring, in the case of class-A solid-state amplifiers, massive heatsinks. This is why class-A amps tend to produce relatively low power, and tend to be heavy and expensive to buy and run. And these days, energy inefficiency is out of fashion.