Aerial's new 6T loudspeaker ($6000/pair) is a 4-driver, 3-way and will be available in February. It sounded very promising: tight bass (the material didn't challenge the extreme bass, but what I did hearbass drumsuggested more extension than you might expect from two 150mm woofers); open top end, uncolored mids; fine imaging. Typically fine sound from Aerial Acoustics.
While it is not quite accurate to say that $500/pair loudspeakers are a dime a dozen, they are by no means unusual. And since this is a price area where major design compromises are mandatory (footnote 1), the sound of such loudspeakers tends to vary all over the map, from pretty good to godawfuldepending on what performance areas the designer chose to compromise and by how much.
I approached this latest half-grander with little enthusiasm, despite Siefert's persuasive literature, I have, after all, been reading such self-congratulatory hype abiout new products for longer than most Stereophile readers have been counting birthdays. This, I must admit, was ho-humsville.
When a manufacturer sets out to design and build a product, be it in high-end audio or any other field, the final retail price is usually a prime consideration. Parts and assembly are only part of the equation; there also must be enough buyers to amortize the design and development costs. If the product is to be a flagship modelsomething a company hopes will give a lift to its entire lineengineers will sometimes throw caution to the winds, designing a product without thought to its ultimate price, which is only set after the design is complete. When Madrigal Audio Laboratories set out to design their No.30 Reference Digital Processor, they appear to have chosen exactly this approach.
I should begin this review by confessing that I've never been a fan of subwoofers. Most subwoofer systems I've heard have been plagued by a familiar litany of sonic horrors: poor integration between subwoofer and main speakers, boom, bloat, tubbiness, slowness, excessive LF output, and an overall presentation that constantly reminds the listener he is hearing a big cone moving. To me, subwoofers often sound detached from the music, providing an accompanying thump that bears little relationship to the sound from the main speakers. Rather than revealing the music's harmonic underpinnings, subwoofers often obscure them in a thick morass of featureless boom. In addition, adding a subwoofer often destroys the qualities of the main speakers that made you buy them in the first placejust to name a few of my observations (footnote 1).
A useful test CD has recently come my way, courtesy of the Stereophile editorial staff in Santa Fe (a copy was provided to each of the contributing equipment editors). Digital Test was produced in France by Pierre Verany (PV.788031/788032, 2 CDs), and is distributed in the USA by Harmonia Mundi. It provides a wide variety of tests and useful musical selections, but the subject of special interest here is its test bands for evaluation of laser-tracking and error-correction capability.
There are two interrelated parameters which, in the absence of drop-outs or information gapswe'll get to them shortlycan affect the ability of a player to track the CD "groove" (or "whorl," as the quaintly translated disc booklet calls it): linear "cutting velocity" and track pitch. The standards for the first establish a range of 1.2 to 1.4 meters/second (the rotation speed of the disc varies from 500 to 200rpm from the inside to the outside of the disc to maintain this linear velocity); for the second, the spacing between adjacent tracks, from 1.50 to 1.70 micrometers (µm).
Compared to the Krell KSA-300S power amplifier that I also review this month, the KRC preamp's design is, at first glance, almost conventional. But its thoroughly high-end internal design has been equally well thought-out and executed. Its main, four-layer, glass-epoxy circuit board is for the audio signal, DC power, and groundtwo layers for the latter are said to minimize noise. The gain stages are pure class-A and complementary. As in the amplifier, the circuit is direct-coupled, with servo circuits controlling the DC offset. The fully regulated power supply is housed in an external chassis. Seven inputs are provided: four single-ended, two balanced, and one single-ended tape. All inputs are line-level except for the optional, single-ended phono stage. (This review will address the line stages; a Follow-Up will discuss the phono stage's operation.) There are three outputs: balanced and single-ended main outputs, and a single-ended tape output.
It was a dark and stormy night. A biting, cold wind cut through Sam's skimpy jacket; ice crystals clung tenaciously to his bushy moustache. As he approached his front door, visions of a toasty-warm, Krell-heated listening room softened the chill. He could feel the glow already; his Krell amp had been on all day, awaiting his return.
You'd probably be surprised to learn that headphones are the most common means for listening to music. No, I didn't get that from a book, but from personal observation. I'm referring here to personal portable stereo listeningthe ubiquitous Jogman with which a whole generation has retreated into its own private world, isolated from traffic noise, muggers, and, at home, housemates or parents screaming "Turn it down!"
James Bongiorno, the engineer behind the Sumo Andromeda, has enjoyed a long and colorful career as an audio amplifier designer. He has cast himself at times as an enfant terrible, exploding at audio critics and running scandalous advertisements (footnote 1). His best-known amplifier is the Ampzilla, produced by Great American Sound, but he also designed the Dyna 400. Currently Jim is living on a boat and serving as part-time consultant to the Sumo Company.
While headphone listening remains secondary to that of loudspeakers for most serious listeners, it's still an important alternative for many. And while good conventional headphones exist, electrostatics are usually considered first when the highest playback quality is required. As always, there are exceptions (Grado's headphones come immediately to mind), but most high-end headphones are electrostaticsuch designs offer the benefits of electrostatic loudspeakers without their dynamic limitations. Last year I reviewed the Koss ESP/950 electrostatics (Vol.15 No.12), a remarkable set of headphones from the company that practically invented headphones for serious home listening. Here I listen to examples from two other companies, each known for its headphones since Pluto was a pup.