Lyra Atlas Cartridge

Lyra Atlas Cartridge

The Atlas is Lyra's flagship model. It is also the first time that anyone has made an asymmetrically structured phono cartridge. Why asymmetric? Because, by literally misplacing the barriers to great sound that are present in every other cartridge today, it confers a number of important performance benefits.

Linear transducers such as loudspeakers and phono cartridges are inherently inefficient devices - somewhere between 5 and 10%. In other words, of the vibrational energy that enters a cartridge from the LP groove, only 5 to 10% will be converted into electrical signal. Some of the remaining 90 to 95% will be dissipated by the cartridge's internal damping system, but much of the excess vibrational energy will reflect inside the cartridge, creating internal echoes, smearing, and a general diminishing of fidelity. It is easy to demonstrate this with many cartridges - play a highly modulated LP with the power amp turned off, and bring your ear close to the cartridge. The "needle-talk" that you hear is excess vibrational energy which isn't being controlled properly.

Designer: Jonathan Carr

Builder: Yoshinori Mishima

Type: Medium weight, medium compliance, low-impedance moving coil cartridge

Stylus: Lyra-designed long-footprint variable-radius line-contact nude diamond (3um x 70um), slot-mounted

Cantilever system: Diamond-coated solid boron rod with short one-point wire suspension, directly mounted into cartridge body via high-pressure knife-edge system

Coils: 2-layer deep, 6N high-purity copper, cross-shaped chemically-purified high-purity iron former, 4.2ohm self-impedance, 11uH inductance

Output voltage: 0.56mV@5cm/sec., zero to peak, 45 degrees (CBS test record, other test records may alter results)

Frequency range: 10Hz ~ 50kHz

Channel separation: 35dB or better at 1kHz

Compliance: Approx. 12 x 10-6cm/dyne at 100Hz

Vertical tracking angle: 20 degrees

Cartridge body: 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

Cartridge mounting screws: 2.6mm 0.45 pitch JIS standard

Distance from mounting holes to stylus tip: 9.5mm

Cartridge weight (without stylus cover): 11.6g

Recommended tracking force: 1.65 ~ 1.75g (1.72g recommended)

Recommended load directly into MC phono input: 104ohm ~ 887ohm (determine by listening, or follow detailed guidelines in user manual)

Recommended load via step-up transformer: 5 ~ 15ohm (step-up transformer's output must be connected to 10kohm ~ 47kohm MM-level RIAA input, preferably via short, low-capacitance cable)

Recommended tonearms: High-quality pivoted or linear (tangential) tonearms with rigid bearing(s), adjustable anti-skating force, preferably VTA adjustment