search

Thanks to Jason and all at Stereophile for such a great review of our amplifier.

All Infigo Audio models are designed to create the ultimate musical experience. Of course, measurements are important, and we thank John Atkinson for uncovering some things that will lead to demonstrable improvements.

Scrutinizing the bias circuit to find and fix what caused those issues revealed a small undershoot of idle bias current right after the zero crossing of the signal. This undershoot deepens with increasing frequency and with total signal-current drawn. This…

That wasn't streaming exactly, or not in the current sense, because the files needed to be downloaded, stored locally, then either played out of a computer or loaded…

Headphone listening
The next thing I did was plug in some headphones. I wanted to learn if I could hear differences with the same tunes streamed over Qobuz via Bluetooth from the phone vs the desktop Qobuz app via USB, and vs Qobuz through Roon via Wi-Fi. I tried an assortment of music from Qobuz's new releases. The Bluetooth stream sounded a bit plastic, as Bluetooth will—not the same tonal balance and not as much low end as Qobuz streamed through Roon via Wi-Fi and direct from Qobuz on my computer connected by USB.

Between USB-connected Qobuz and Roon-streamed Qobuz,…

Description: Streaming digital-to-analog converter with built-in Roon core and network-server capabilities, with analog preamplifier, headphone amplifier, and MM/MC phono stage. Digital inputs: Bluetooth 5, Wi-Fi, Ethernet, S/PDIF (2 RCA, TosLink), USB2 Type B, 2 USB-A (for attaching storage or another DAC for a second Roon zone). Analog/phono inputs: one pair single-ended (RCA) line-level, one pair single-ended (RCA) phono. Analog outputs: one pair balanced (XLR), one pair single-ended (RCA). Headphone outputs: two ¼" stereo convertible to 1 pair balanced; 6W…

Digital sources: Oppo DV-981HD universal disc player, dCS Bartók DAC/streamer.
Analog sources: Technics SL-1200MK7 turntable, Ortofon 2M Blue cartridge, Pro-Ject Phono Box RS2 preamp.
Preamplifier: Benchmark LA4.
Power amplifier: LSA Warp 1, Little Labs Monotor (headphone).
Integrated amplifier: McIntosh MA6500.
Loudspeakers: B&W 808, Amphion One18.
Headphones: Sennheiser HD 650, Neumann NDH 30, AKG K240DF.—Tom Fine

I measured Mytek's Brooklyn Bridge II Roon Core using my Audio Precision SYS2722 system. I powered up the Mytek then connected it to my router with an Ethernet cable. However, the processor remained inert—it needed to be powered up after the Ethernet connection had been made. When I opened the Roon 2.0 app on my iPad mini, Roon identified two Brooklyn Bridge IIs in the Audio Settings window, one a generic ALSA device, the other a networked audio device not yet certified. I managed to enable the latter.

The Brooklyn Bridge II was recognized as a Roon core. I…

Her father is John Lenard Burnett of Lenard Audio, a veteran designer, researcher, and educator whose work has crossed over from recording studios, concert halls, and commercial spaces to hi-fi for the home. The Opal 4-way active loudspeaker system is the senior Burnett's signature product and serves as the foundation of Lenard Audio's hardware and strategic…

Japanese culture is so formal that there is a precise etiquette of how to offer one's business card: Hold the card lengthwise in both hands, gripping it between thumbs and index fingers, and present it with a slight bow. For someone with so long and distinguished a career…

Setup and use
Though its headshell screws are inserted from the bottom up, threading into nuts atop the shell (as in Miyajima Laboratory cartridges), the AT-ART1000's securely locking stylus guard reduces anxiety during installation: Cleverly designed holes in the transparent-plastic guard let you install the cartridge with the guard in place. Still, setting overhang and tightly securing the cartridge to the shell with the supplied slotted screws can be tricky, unless you have a very short screwdriver.

Setting zenith angle and overhang are more difficult, because the AT-…