Although it was branded as JansZen, the Z-600 was manufactured by the Neshaminy Corporation. The JansZen connection was that it used two square electrostatic tweeters, mounted side-by-side and licensed from Arthur A. Janszen, who had presented a paper, "An Electrostatic Loudspeaker Development," at the Sixth Annual Convention of the Audio Engineering Society in October 1954. (His paper was subsequently published in the first issue of the JAES and reprinted in the journal's anthology, Loudspeakers Vol.1–Vol.25 (1953–1977).) Arthur Janszen subsequently joined KLH and was responsible for the legendary KLH Nine full-range electrostatic loudspeaker, which Gordon Holt reviewed in June 1966, subsequently writing, in 1968, that "this is probably the most nearly perfect loudspeaker we have tested until this time."
Neshaminy ceased operation in the 1970s, KLH was purchased by Kyocera in 1982, which decided to stop manufacturing audio products (footnote 1), and Arthur Janszen passed away in 1991. The JansZen Audio company was founded by David A. Janszen, Arthur Janszen's son, to honor his father's legacy.
The Valentina P8 This full-range, floorstanding loudspeaker costs $9250/pair. Like the Z-600, the P8 uses two electrostatic tweeters, but here they are mounted one above the other in the center of the front baffle forming a panel measuring 7" wide by 16" high. Unlike other electrostatic loudspeakers, which have a dipolar radiation pattern, the P8's panel is loaded with a sealed subenclosure. Two 8" dynamic woofers handle frequencies below 500Hz, one mounted above the electrostatic driver, one below. These, too, are loaded with a sealed enclosure, which the JansZen Audio website says results in the best transient response, minimal group delay, and the best integration with the ESL array. The woofers' level can be increased or decreased by 3dB with a rear-panel switch. The level adjustment is performed using an autoformer rather than a resistive L-pad, which is said to maintain damping factor and cone control.
The electrostatic driver uses a diaphragm with a thickness less than 1/15th of a sheet of 20lb paper—"lighter than the air it is driving"—and is energized with 66-element, parallel-wire, stator electrodes, these supported by an injection-molded ABS frame. The two halves of the ESL panel are canted relative to one another, one tilted slightly backward relative to the baffle face, the other slightly forward. David Janszen explained in an email that this "opens up the vertical listening window from pretty much zero to more like 5° at 10kHz by breaking up the tall aperture." The ESL panel employs what Janszen calls "a half-split, 1.5-way" feature. This controls dispersion by reducing the effective width of the ESL unit. In conjunction with the capacitance of half the panel, a series resistance creates a first-order low-pass rolloff at 5kHz from each panel's inboard half—"dead simple and yet effective," said David Janszen. A rotary level control on the rear of the enclosure allows the ESL panel's level to be reduced by up to 6dB. The AC power supply for the ESL drive unit is agnostic about wall voltage.
The Valentina P8 is supplied with a previously optional feature, the "airLayer." An auxiliary 1" silk ring-dome tweeter is mounted outboard on each speaker, firing sideways toward the near sidewall. A rotary control at the top of the rear panel allows this unit's level to be adjusted from its maximum to completely off. Other than the airLayer tweeter, all the drive units are concealed by nonremovable grilles.
Electrical connection is via a rhodium-plated, solid-copper Cardas dual binding post. The review samples were fitted with the biwiring/biamping option, which adds a pair of conventional binding posts. The JansZen's well-braced enclosure features a 2.5"-thick, poly-and-wax-finished hardwood baffle, with profiled vertical edges. The other walls are 1" thick. The P8 needs to be tilted back so that the center of the ESL panel is aimed toward the listener's ears. To this end, the enclosure is mounted at an angle on a hefty base, which sits on rubber feet or carpet-piercing spikes.
Setting up The primary music source for this review was my Roon Nucleus+ feeding audio data over my network to an MBL N31 CD player/DAC, which was connected either to a pair of Parasound Halo JC 1+ monoblocks or the Luxman M-10X stereo amplifier, which I reviewed in the May issue. The JansZen speakers were single-wired with AudioQuest Robin Hood cable.
With its three level controls, the tiltback of the baffle, and the side-mounted auxiliary tweeter, optimizing the Valentina P8's setup proved complex. Fortunately, the extensive manual offered useful advice. It advised that, as shipped, the tiltback is correct for a listening distance of 8'–13' with an ear height of 39". It recommends using a mirror taped about 6" from the bottom edge of the rectangular grille with a piece of tape centered on the bottom of the mirror. Sitting at the listening position, with your head facing forward, the tilt is correct when you can see your right eye or ear at the marked position on the mirror. My listening distance with the speakers set up where the low frequencies sounded best-balanced was 10' 6". If I sat up straight, my ears were exactly on the intended axis.
Footnote 1: The KLH brand has been resurrected. See Ken Micallef's review of the new KLH Model Five, which includes a succinct history of the company.
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