After I read Brian Damkroger's rave review of the Audio Research Corporation's Reference 5 SE line stage in the November 2012 Stereophile, I was excited about getting the review sample into my system so that I could do a Follow-Up (February 2013). However, the sample had already been returned to the factory, so I called ARC to see if it could be rerouted eastward to me. Chief Listener Warren Gehl answered the phone.

"Sure, you can listen to the Ref 5 SE, but I'd assumed you were calling about the Reference 75 amplifier."

"Reference 75? What's that?"

"It's our newest amplifier—a half-power version of the Reference 150."

You know what's fascinating? As digital audio technology matures, DAC design is not converging on a single most popular or overall best approach. Multiple design paths continue to thrive, new ones are still appearing, and each variation on the DAC theme has its adherents and side trails: bitstream, non-oversampling, upsampling, various filters, DSD playback options, and on and on.

Monday, January 14, was a difficult day for the abandoned amusement park that is my body. In the morning, I packed two Lamm ML2.2 amplifiers into their wooden crates and wrestled them outside for collection by some unlucky air-freight courier. After that, I backed up my car to the tiny front porch of our house so I could unload a pair of 1966 Altec Valencia loudspeakers I'd collected the day before: in excess of 100 pounds each, just like the crated Lamms, but considerably larger.

My hi-fi basked in morning sunshine. The sparkling white finish of the Usher 520s reflected angular glints of yellow light across plaster walls. Birds chirped as I hoped for the best. Would my bass bloat be gone? Would I have an evenly dispersed image?