Herb had his best results driving the RAAL-Requisite 'phones with solid-state amps, and said of the SR1a/Pass XA25 amp combo, "No matter what hi-fi you have, it's unlikely to dig deeper and find more beauty in your recordings." (Vo.43 No.1 WWW) Electrically, the SR1a's are built using open-baffle ribbon drivers, the very low impedance of which force the need for an impedance-matching box (included) and a 50–150Wpc loudspeaker amplifier (not included). I never felt more kindred or connected to Schoenberg." He also suggested that the Abysses "delivered detail and soundstage images with an uncannily visual-nay, infinite-depth of field." (Vol.40 No.8 WWW)ĭescribed by HR as headphones that will satisfy "headphone connoisseurs and stubborn contrarians" alike, the off-the-ear RAAL-Requisite SR1a's have a physical design that prevents them from covering or putting pressure on your pinnae: Their sound character is not determined in any way by a padded acoustical chamber around the listener's ears. After listening to a Schoenberg piece through the Abysses driven by the Woo WA5 headphone amp, HR observed: "I scribbled the phrase perfectly natural several times. Specs include an 88dB sensitivity and an impedance of 42 ohms. JPS Labs Abyss AB-1266 Phi TC: $4995$7995įor those who regard the JPS Abyss AB-1266 Phi headphones as prohibitively expensive, HR offers perspective by suggesting that they, like such "notorious legacy products" as the Wilson Audio WAMM loudspeaker of 1983 and the Audio Note Ongaku amplifier of 1993, "exist in categories of price and performance all their own." The Abyss 'phones are built into black-anodized aluminum frames, and use single-magnet planar-magnetic drivers, separated from the wearer by rotatable lambskin earpads held in place with magnets. The Susvaras weigh 15.9oz, and offer an impedance of 60 ohms and a sensitivity of only 83dB. The drivers also use HiFiMan's Stealth Magnet grids, the individual magnetic strips of which have rounded edges to reduce interference with sound output. The HiFiMan Susvaras are over-the-ear headphones with planar-magnetic drivers, built around gold-coated Nanometer Grade diaphragms-their thinnest ever, the company claims. HR described the Utopias as capable of producing "a gut-level realism that is rare in high-end audio," adding that the Focals are "lightning-fast, extremely open, and profoundly uncolored." (Vol.39 No.10, Vol.41 No.6 WWW) The yokes are made of carbon fiber, and the earcups and headband are covered with lambskin. The fully open-backed, circumaural Focal Utopias are designed around proprietary beryllium-dome full-range drivers that, uniquely, have no voice-coil formers: each coil is fastened directly to its dome, in a crease near its surround. Editor's Note: We strongly recommend those interested in headphone listening visit our sister website, which is edited by Rafe Arnott.
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