{"id":182,"date":"2021-04-12T16:19:44","date_gmt":"2021-04-12T14:19:44","guid":{"rendered":"https:\/\/acousticprecision.wordpress.com\/?page_id=182"},"modified":"2021-06-08T13:20:41","modified_gmt":"2021-06-08T11:20:41","slug":"lyra-atlas-mono","status":"publish","type":"page","link":"https:\/\/acoustic-precision.fr\/index.php\/lyra-atlas-mono\/","title":{"rendered":"LYRA ATLAS Mono"},"content":{"rendered":"\n
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LYRA ATLAS Lambda MONO<\/strong><\/strong><\/p>\n<\/div>\n\n\n\n

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Premi\u00e8re cellule phono \u00e0 bobines mobiles de structure asym\u00e9trique<\/em><\/strong><\/p>\n\n\n\n

Le haut de gamme de LYRA.<\/p>\n\n\n\n

LYRA ATLAS Lambda MONO : monophonic “New Angle”<\/strong><\/p>\n\n\n\n

This is a special, built-to-order, mono version of Atlas for real mono playback of monaural\/monophonic (mono) microgroove, vinyl records. It is recommended that the Atlas Mono is used with high-gain, low noise phono stages, or alternatively a step-up transformer designed for phono cartridges of 2 – 3 ohms or less.
On mono records, the vertical axis of the groove contains no musical information, but it will frequently have noise, in the form of groove damage and dirt. The Atlas Mono has therefore been designed to be completely insensitive to the vertical axis, which greatly improves the signal\/noise ratio without any downside on monaural records.
The coil former is a square permeable plate oriented parallel to the record surface rather than the 45-degree angle used for most stereo cartridges, while the coils are wound so that they only generate a signal when there is horizontal movement of the stylus and cantilever when tracking a record.
Two totally separate monaural coils are used in the Atlas Mono, since most monaural cartridges are used with stereo amplifiers and stereo speakers. The separate coils also help avoid possible ground loops and hum problems that could otherwise be caused if a single coil is fed into a stereo two-channel amplification system, thereby tying the two channels together electrically.
In addition to parallel mono connection to a stereo system (two amplifiers and two speakers), it is also possible to leave one set of connections unattached for pure mono playback with a single amplifier and a single speaker. However, it is also possible to connect the two mono channels in series for additional output when used in a pure mono system. Use a short cartridge headshell lead wire with female pin-connectors to connect either the Atlas Mono’s upper right pin with the lower left pin, or alternatively the upper left pin with the lower right pin. Then use the two remaining unused pins for connection to your single amp RIAA input (alternatively a transformer input). The two internal channels are now “chained” in serial-connection for additional output and energy when you only use a single amplifier and a single speaker.

SPECIFICATIONS FOR ATLAS MONO<\/strong>
\u2022 Designer:<\/strong> Jonathan Carr
\u2022 Builder:<\/strong> Yoshinori Mishima (final build, testing), Akiko Ishiyama (preliminary build)
\u2022 Type:<\/strong> Medium weight, medium compliance, low-impedance, low-output moving coil cartridge
\u2022 Stylus:<\/strong> Lyra-designed long-footprint variable-radius line-contact nude diamond (3um x 70um profile, block dimensions 0.08 x 0.12 x 0.5mm), slot-mounted
\u2022 Cantilever system: <\/strong>Diamond-coated solid boron rod with short one-point wire suspension, directly mounted into cartridge body via high-pressure knife-edge system \u2022 Coils:<\/strong> Two individually isolated monophonic\/monaural 6N high-purity copper coils wound in parallel (on top of each other) on a square-shaped chemically-purified high-purity iron former with 3.0 ohms self-impedance
\u2022 Output voltage:<\/strong> 0.25mV@5cm\/sec., 2.4\u03bcH inductance degrees (CBS test record, other test records may alter results)
\u2022 Frequency range:<\/strong> 10Hz ~ 50kHz
\u2022 Compliance:<\/strong> Approx. 12×10-6cm\/dyne at 100Hz
\u2022 Vertical tracking angle:<\/strong> 20 degrees
\u2022 Cartridge body:<\/strong> One-piece machining from solid titanium billet, with reduced-surface higher-pressure headshell contact area, predominately non-parallel and asymmetrical shaping, phase-interference resonance-controlling mechanism, and body threaded directly for mounting screws
\u2022 Cartridge mounting screws:<\/strong> 2.6 mm 0.45 pitch JIS standard
\u2022 Distance from mounting holes to stylus tip:<\/strong> 9.5mm
\u2022 Cartridge weight (without stylus cover):<\/strong> 11.6g
\u2022 Recommended tracking force: <\/strong>1.65 ~ 1.78g (1.72g recommended)
\u2022 Recommended load directly into MC phono input: <\/strong>Determine by listening,
\u2022 Recommended load via step-up transformer: <\/strong>Use a step-up transformer designed for 2 – 3 ohms cartridge impedance. The transformer output must be connected to standard 47kohm MM-level RIAA input, preferably via short, low-capacitance cable
\u2022 Recommended tonearms: <\/strong>High-quality pivoted or linear tangential tonearms with rigid bearing(s), adjustable anti-skating force, preferably VTA<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
Lyra-Atlas-F<\/a><\/div>\n\n\n\n
LYRA-Atlas-SL-Review-TAS<\/a><\/div>\n\n\n\n
Lyra-Atlas-Lambda-The-AudioBeat<\/a><\/div>\n\n\n\n

Les technologies LYRA :<\/strong><\/p>\n\n\n\n

Cellule \u00e0 Structure Asym\u00e9trique<\/strong><\/p>\n\n\n\n

C\u2019est la premi\u00e8re fois qu\u2019une cellule phono est dot\u00e9e d\u2019une structure asym\u00e9trique. Cette structure permet de contourner les barri\u00e8res au \u00ab grand son \u00bb pr\u00e9sentes dans les cellules phono actuelles.<\/p>\n\n\n\n

R\u00e9sonances et vibrations r\u00e9duites<\/strong><\/p>\n\n\n\n