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“To put the Qualiton A50i to the test in more of a brute-force way, I cued up “Back in Black” from AC/DC’s album of the same name. While some would argue that tube amps are for more refined music, my tastes are broad, and I never know what the mood brings, so any amplifier in my system needs to stand up to whatever the occasion brings.

Thankfully, the A50i delivered. The amp maintained the grit and energy of Brian Johnson’s raspy voice, and struggled not in the slightest with the song’s driving bass. There was no indication of distortion, but I did notice some loss of energy at the very bottom end, which had more to do with the QLN Signature 3’s 42Hz low frequency response, not the A50i’s 30Hz -3dB point.”

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