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Chicago retailer Pro Musica, led by recording engineer Ken Christianson, had two rooms at AXPONA. The first featured a system built around Dynaudio's Confidence C2 Signature loudspeakers ($13,500/pair in standard Mk.II finishes; $15,000/pair in Signature finish). The electronics were a Naim NAP 300 amplifier with 300PS power supply ($11,495), Naim 282 preamp with NAPSC2 ($6795), Naim SuperCap2 DR preamp power supply ($6595), Naim UnityServe SSD server ($3045), Naim NDS streaming player ($10,995) with Naim 555PS DR power supply ($9645). Speaker cable was Naim NACA5 ($15/foot) and the equipment rack was the Quadraspire EVO (6 shelf, $1200).

In Pro Musica's second room, Dynaudio's Confidence C1 Signature speakers ($8500/pair in Signature finish, $7700/pair in standard Mk.II finish) were driven by Naim's SuperUniti integrated streaming amplifier ($6000), hooked up with Naim NACA5 speaker cable ($15/foot). I listend again to some of Ken Christianson's recordings on the Naim label, including a Schubert Symphony 5 performed by Iona Brown leading the Norwegian Chamber Orchestra. Sonics, music, balance, communication—I wanted for nothing.

Lowther-America showcased their prototype, 98dB-sensitive speakers. Aimed at the DIYer, but potentially available in finished form, the open-baffle design uses a Lowther PM5a, Rythmic subwoofer with dedicated servo amplifier, and SLS ribbon tweeter crossed over at 11kHz (DIY parts cost approx. $4500, custom-built approx. $12,000).

In Room 806, one word said it all: Rega. Demming the Rega RP8 turntable with Rega Exact 2 cartridge ($3400), Rega Apollo R CD player ($1095), Rega Brio R integrated amp with phono stage ($895), and Rega RS3 floor-standing speakers ($1395/pair), the nattily bow-tied Barnaby Fry of The Sound Organisation was having a ball playing Johnny Adams' From the Heart. The system did best on Adams' voice—the voice was great—but when the blues artist sang, "I can't control the vibrations," I'm afraid he was talking about the limitations of the system's bottom reach and bass control. (For starters, I don't believe power conditioning or special equipment supports were in use.) But on voice and piano, Rega x 4 = very nice.

As Halie Loren sang her distinctly un-Peggy Lee version of "Fever," I reflected on how much I love the color and warm of Unison Research electronics. The internal glow of the sound, and the sweetness of the electric keyboard, especially stood out. Yummy.

I first heard the dipole Orion 4 speakers ($14,750/pair with Analog Signal Processor), designed by Siegfried Linkwitz and manufactured by Wood Artistry of Healdsburg, California, at the 2011 AXPONA in Atlanta, where they were one of the best-sounding rooms at the Show. They were in too large a room in Chicago, but still managed to sound clean and natural, with a full range of frequencies, driven by Pass Labs amplification with DH Labs cabling. I refer you to me 2011 report for details on the speaker's design but new at Chicago was a refined version of the Analog Signal Processor, with closer-tolerance crossover components, and an amplifier/processor that obviates the need to drive the Orions with 6 or 8 amplifier channels and the resulting confusion of cables.

The Chicago Show was my second opportunity to hear the unique circular-arc line array speakers designed by legendary audio engineer Don Keele, who was for many years the speaker reviewer at the long-gone Audio magazine. The 5'-tall CBT36 covers a 36° vertical arc, and with its 72 ¾" tweeters and 18 3.5" midrange units, all sourced from Dayton, projects a tailored wavefront that both allows for a very wide sweet spot from where a stereo image can be perceived and doesn't fall off with distance in the usual manner. The speakers used a DEQX digital crossover and were being driven by an Acurus amplifier. They were operating down to 45Hz, below which a subwoofer took over.