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About AmpRx

Today, we should be receiving 120V AC from the wall, but depending on where you are and what time of day it is, you can receive anywhere from 120V to 129V. That’s not good for your amplifier, or your ears. Depending on the specifics of your particular amplifier, you might discover that it runs optimally at as low as 112VAC. You can’t expect an amplifier that wants 112VAC to sound anywhere near the way it should at 129VAC. The BrownBox features a proprietary 5 Amp transformer and flexible voltage attenuation options that let you bring your power input down to an optimal level, resulting in significantly improved amplifier performance. Not only that, the BrownBox itself is the very thing that can help you find your Magic Number. You may have never even heard or felt your amplifier running on optimized voltage. The BrownBox has an easy to read LCD screen and an onboard voltmeter so you will always know exactly what voltage you’re receiving from the wall before you ever plug in your amplifier. Play through your amplifier at as many different voltages as your heart desires and you’ll hear the difference. When the dynamics of a tube amplifier supplied with the proper line voltage are optimized, it will sound and respond as originally intended, revealing the circuit’s true harmonic content. This is the starting point- the basis of the signal chain- and where serious musicians begin creating a signature tone.

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