When all you've ever heard are wooden boxes that shout, it's difficult to recognize their highly accented "voice." Few of us actually notice how miserably distorted all loudspeakers are. Don't believe me? Try listening to a recording of your child's voice, the sounds of rattling keys, or an audience applauding.

Of the hundreds of product reviews I have written over the years, it is perhaps those of power amplifiers that present the hardest task in defining their worth. This is not because power amps are unimportant. As I wrote in my review of the MBL Corona C15 monoblock, in June 2014, "it is the power amplifier that is responsible for determining the character of the system's sound, because it is the amplifier that must directly interface with the loudspeakers. The relationship between amplifier and loudspeaker is complex, and the nature of that relationship literally sets the tone of the sound quality." But because the amplifier's role is so fundamental, it can at first be difficult to determine a given amp's balance of virtues and failings. A paradox.

Most of us have experienced the proverbial curveball that comes out of nowhere to smack us right in the head. My most recent such encounter was pitched by Stereophile contributor Steve Guttenberg.

Steve's whammy arrived amid an e-mail exchange among Stereophile writers concerning a rather clueless column in another publication on the dearth of women audiophiles. After asking how many female audiophiles each of us knew, Steve G. defined what he meant by audiophile: "a person who frets over their system, agonizes over choices, loves gear, and sometimes music. You know, the kind of person who reads Stereophile or The Abso!ute Sound. Merely owning a nice stereo doesn't make you an audiophile. Owning a Leica doesn't make you a photographer. You have to be at least a little obsessed."

Sly and the Family Stone: Live at the Fillmore East, October 4th & 5th, 1968
Epic 88843023712 (4 CDs). 2015. Sly Stone, orig. prod.; Bob Irwin, reissue prod.; Vic Anesini, mastering. AAD? TT: 3:27:31
Performance *****
Sonics ****

The first thing you hear is not Sly Stone's keyboards or harmonica. Not Freddie Stone's guitar. Not Greg Errico's amazing drumming. Not Larry Graham's slapping bass. Not the voices of Rose Stone (also keys) and Cynthia Robinson (also trumpet). Not Jerry Martini's saxophone.

No. The first thing you hear is pure energy: the nuclear reaction of musical power that Sly and his Family Stone generated onstage on two October nights in 1968 at the Fillmore East. James Brown and his band(s) had nothing on these seven. This is prime Sly, when the band was still hungry, before the hits, before his life spun out of control, the music suffered, and the family split.

High-end audio dealer Audio Den of Long Island (2845 Middle Country Road, Lake Grove, NY 11755) is hosting a music evening Friday, July 24, 5:00–8:00pm, to launch Technics' new Premium and Reference series integrated amplifier, network player, and speakers in North America.

On Wednesday, July 22 (Raleigh) and Thursday, July 23 (Pineville), 5–9pm, Audio Advice (8621 Glenwood Avenue, Raleigh; 11409 Carolina Place Parkway, Pineville) will host its annual Digital Living event, while on Friday, July 24, 6–8pm, Vintage King Audio (2826 Dogwood Place, Nashville) will host an evening seminar with AudioQuest's Steve Silberman, focusing on the tools and resources needed to turn a computer into a true high-resolution music source.