Digital Processor Reviews

Three high-performance products were subjected to second opinions and/or measurements in recent issues: Channel D's Lino C 3.3 phono preamplifier, Mola Mola's Tambaqui D/A processor, and Pass Labs' XP-32 line preamplifier.

Music lovers (and reviewers) long for those listening moments when their entire being lights up with joy. For me, that divine spark surfaced unexpectedly one February afternoon when, late for an appointment, I dashed into the music room, searching for my keys. That's when I heard a bit of the 24/96 WAV files of this issue's Recording of the Month, conductor Andris Nelsons's mammoth survey of the complete orchestral works of Richard Strauss, which I'd cued up on repeat to help Meitner's MA3 integrated D/A converter ($10,500) settle in.

The increasing prominence of Blu-ray explains why a device to extract audio from an HDMI stream has become necessary. At first, Blu-ray players had HDMI outputs for video and audio, but to speed their adoption, they also sported analog audio outputs to help users who had older AV receivers (AVRs). Bye the bye, those audio outputs were pared off.

Ah, domesticity. Just when I had the reference system sounding better than ever, the husband decided to relocate his electric keyboard and music stand, which had been positioned along the right wall of the detached music room, to the dining room in the main house. His reason was rational: While I did the reviewer thing in one space, he'd be free to practice keyboard and sing in another. But what was rational to him screwed with my reference sound and drove me to the brink of irrationality.

I start this review with a confession. I have consistently found that when I play CDs on a transport and feed the digital data via AES3 (AES/EBU) to a D/A processor, the music has more drive, particularly at low frequencies, than it does when I send the same 16/44.1 data to the same D/A processor via my network.

There are words that, for reasons I can't fathom, I cannot stand. One such is "dongle." So when Bluebird Music's PR rep emailed me to ask if I would be interested in reviewing a new dongle from Chinese company Questyle Audio, I shuddered. But I must admit that "dongle" rolls off the tongue a lot more readily than "portable USB D/A headphone amplifier." I put aside my grammatical quibble and agreed to a review.

The January and February 2022 issues of Stereophile feature followup reviews of three products: the darTZeel NHB-18NS Mk.2 preamplifier; the Sutherland Little Loco Mk.2 phono preamplifier; and the Mola Mola Tambaqui D/A processor.