The road to hell is paved with good inventions: clever ideas that appear, in hindsight, motivated more by a desire to sell clever ideas than to make musically superior products.

The DiaLogue tube amplifiers from PrimaLuna have, at their heart, a clever idea of their own: an output circuit that is user-switchable between triode operation, in which the screen grid of a tetrode or pentode power tube is defeated by means of connection to the tube's anode; and Ultralinear operation, in which the screen grid of a tetrode or pentode carries a portion of the AC music signal, supplied by a tap on the output-transformer primary, in a feedback-like effort to reduce distortion and increase power. Fans of the former often report a sweeter, more tubey sound, while fans of the latter report a tighter, more detailed, more timbrally neutral sound. Audio enthusiasts are given to reporting any number of things.

Last month, I wrote about Light Harmonic's use of Kickstarter to fund the final production and packaging of their Geek Out portable USB DAC–headphone amplifier. The campaign raised $303,061 from 2146 backers. That success led Light Harmonic to create a new division dedicated to mass-market products: LH Labs. The Geek Out would be its first product. (Pre-orders are still being accepted.) LHL's second product would be the Geek Pulse, a "pure class-A" desktop integrated amplifier–DAC capable of handling 32-bit/384kHz PCM files, as well as decoding native DSD64 and DSD128 files.

Domestic audio is based on two simple processes: transforming movement into electricity and electricity back into movement. Easy peasy.

Audio engineers have been doing those things for ages. Have they improved their craft to the same extent as the people who, over the same period of time, earned their livings making, say, automobiles and pharmaceuticals? I don't know. But if it were possible to spend an entire day driving a new car from 50 years ago, treating diabetes and erectile dysfunction with the treatments that were available 50 years ago, and listening to 50-year-old records on 50-year-old playback gear, the answer might seem more clear.

You don't need me to tell you that listening habits are changing. Although those who predict that the end of our beloved home stereo systems is near (footnote 1) have more than a little in common with those who predict the imminent destruction of humankind, there's no question that listening via computers, iPods, and headphones has become the order of the day among a large segment of younger Americans.

James Booker: Classified: Remixed and Expanded Rounder 11661-9175-1 (2 LPs). 1983/2013. Scott Billington, John Parsons, prods.; Jay Gallagher, eng.; Jonathan Wyner, transfer eng.; David Farrell, remix. ADA. TT: 68:12 Performance ***** Sonics ****½

Before anything else, there's his musicality. No one has ever played the piano like James Carroll Booker III. If the piano is New Orleans' preeminent musical instrument, then Booker is its most talented virtuoso. A child prodigy who went on the road as part of Little Richard's band when he was 14, the Ivory Emperor, the Bronze Liberace, Li'l Booker, Little Chopin in Living Color (as he was variously known throughout his life) was breathtakingly gifted.