Historically, only two types of speaker designs paired well with SET amplifiers. It seemed like a perfect pairing of an ancient technology with a brand new one. Readers were requesting that I review several types of SET amplifiers (using different triode tubes) to see how well this breed of amplifier would team up with the Double Impact speaker, which has a 98.82-dB efficiency rating and gentle crossover slopes, and it never dips below four ohms. To get the magic from an SET amp, you have to mate it with a very high-efficiency speaker, at least around 95 dB or higher-and the speaker can't have any nasty low-impedance curves in its design. However, they also earn the nickname "flea-watt amplifiers" because their total power output is anywhere from two to eight watts. SET amplifiers and the tubes used in them (45s/2A3s/300bs) have attained cult-like status because they reproduce certain aspects of music in a special and unique way. Immediately after my review of the Tekton Design Double Impact floorstanding speaker was published, I began to receive emails from readers who saw the potential of mating the Double Impacts with one of the most legendary amplifier designs: the SET, which stands for Single-Ended Triode.
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