Fryette Amplifications ZMACS Impedance Matching Amp & Cab Selector

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Seamless Switching with Precision - The Fryette Amplifications ZMACS Impedance Matching Amp & Cab Selector Multiple amplifier and speaker cabinet selector systems have been around for decades and offer a wide variety of features and functions. Yet, in all that time, not one of these products has been designed to address the single most important application question surrounding mixing and matching tube amps and speakers: “It is safe to mismatch the impedance of my prized vintage amps and cabs?” Most vacuum tube guitar amplifiers require that the user manually set the amplifier output impedance to match the impedance of the speaker cabinet. Moreover, tube amplifiers require connection to a specific impedance load to operate properly, maintain tone and avoid damage to the output tubes and transformer. Today’s users own a wide variety of vintage and modern vacuum tube amplifiers, all of which exhibit lesser or greater degrees of sensitivity to their applied external loads. This is an esoteric operating condition not well understood by producers of amp switchers, let alone the average user, and raises the possibility of damage to expensive, and possibly irreplaceable vintage gear, as well as expensive to service modern tube amplifiers. Even when running at conservative volumes, an impedance mismatch will at the very least cause highly apparent tonal alterations. Given the importance of this inescapable tube amp operating requirement, why don’t any amp switcher producers offer a solution? The truth is, all of these products answer this question the same way: “It really doesn’t matter.” At Fryette Amplification, we strongly disagree. It does matter! Here’s why: In order to safely use any of the currently available amplifier/cabinet switching systems, the user must either manually set each amplifier to operate correctly into the desired load, or operate a given amplifier or speaker cabinet (load) at a relatively benign mismatch and hopefully avoid any potential conseq