Recently, I posted an entry in the Ultimate Tech blog about a new type of tweeter called the Leading Edge Transducer (LET). In that article, I made some statements to which reader Noah Katz, a structural engineer and, presumably, an audiophile, took exception. At first, I was going to ignore him because he refused to engage in a dialog about it. But, being me, I couldn't resist digging deeper to uncover the truth. After all, one of my guiding principles as a technical journalist is to get the facts straight, and if I don't—which, as a human, is inevitable once in a while—I feel compelled to correct my mistakes.

What do you get if you cross Japanese audio acumen with daring Italian design? The Squeezophone 360, that's what. Born out of a collaboration between Kenwood Design and Claudio Colucci Design, this concept speaker cuts a dashing figure as it pumps sound all around the room.

The materials used to make speaker diaphragms are well established—polypropylene, paper, Kevlar, aluminum, titanium, beryllium, silk, and even diamond, to name a few. So I was surprised to find a speaker system with diaphragms made of glass. Developed over nearly four years by a Japanese glass company called Hario (Japanese for "king of glass"), the Harion system is certainly intriguing, though the English-language website linked here has nothing about it, and the company did not supply much info, even after repeated requests.

Transducers—devices that convert one form of energy into another—are among the most mature technologies in the audio world. The most common musical transducers are microphones, which convert the mechanical energy of acoustic sound waves into electrical signals, and speakers, which do exactly the opposite. Both have been around for a century or so, and despite a few innovations and variations, they haven't changed much in all that time.

As I was looking for products to profile in this blog, I came across something astonishing—a tube-based monoblock power amp that costs $350,000/pair! Hand-built by Japanese boutique maker Wavac Audio Lab, the SH-833 isn't new—it was reviewed in Stereophile in 2004—but when I saw that price tag, I knew I had to include it here.

Danish speaker maker Dynaudio has earned a stellar reputation among audiophiles since its founding in 1977. The current flagship line, known as Evidence, is not new—the Master model was selected as one of Stereophile's products of the year in 2000—but that doesn't mean it can't still kick some serious butt. I wanted to see what the ultimate Evidence home-theater system would consist of—and how much it would cost.

Normally in this blog, I profile a specific product or product line that can be considered "ultimate" in one way or another. But when it comes to a California company called CAT MBX, this approach doesn't work so well. An offshoot of California Audio Technology, CAT MBX designs and builds ultimate home theaters from scratch, customizing the speakers, electronics, and projection system for each venue. The company's "product" is the entire theater, which is unique for each client.