Audio Database

L-570X's (Equus)
Commentary

As the third generation 570, while inheriting the elements of L-570, the know-how obtained in L-570Z's was incorporated and the technology was further elaborated to complete the pre-main amplifier.

Inheriting the track record and know-how of A-class amplifiers, we have adopted a pure A-class system that always supplies a large amount of current.

In addition to the concept of "Simple is best" pursued in the L-570, a newly designed circuit board has been adopted to eliminate complicated routing and sound quality neckpoints in the signal path from the input terminal to the speaker terminal and ensure a simple and smooth flow.
In addition, a new type of gold contact relay is adopted for the switching of the input section, and by switching the input at the optimum position close to the input terminal, the routing of the signal path is minimized. Since this relay circuit switches not only the hot side but also the ground side, everything except the selection signal circuit is completely disconnected, enabling pure signal transmission.
In addition, the A/B switching of the speaker and even the headphone terminal are eliminated for complete simplification.

The power supply section is equipped with a newly designed power transformer that enhances dynamic energy supply capability rather than static characteristics.
In addition, we use our own custom parts for regulator circuits and constant voltage circuits.
The low impedance drive capability is improved by this power supply, and the load drive capability of 200W + 200W at 2 Ω load is obtained according to the theoretical value.

The volume uses a rotary switch type Ultimate Attenuator, eliminating the limitations of sound quality due to the stray current of the sliding part and the contact material that were generated in the continuously variable volume.
This is based on a 32-contact rotary switch made of a glass-epoxy gold-plated substrate, and non-magnetic resistors are mounted one by one. Further improvements such as higher gap accuracy have improved usability.

In order to achieve higher sound quality, many custom parts are used.
Other audio parts include non-magnetic resistors with gold-plated caps, polystyrene capacitors with copper foils, pure focus electrolytic capacitors, and high-purity copper cables.

The bottom chassis is made of high-rigidity and large-mass ceramic special FRP, eliminating resonance as a construction with symmetric weight balance.
In addition, a 5-point grounding insulator reduces the effects of external and internal vibrations.

A tone compensator is installed as a tone correction circuit.
This circuit allows natural phase correction rather than large f-specific movement as in conventional tone control.

Model Rating
Type Integrated amplifier
Continuous effective output 50W + 50W (8 Ω, Class A Operation)
Total harmonic distortion factor 0.01% or Less (8 Ω, Rated Output, Direct On)
Cross modulation distortion factor 0.01% or Less (8 Ω, 60 Hz : 7 kHz = 4 : 1, Rated Output, Direct On)
Input Sensitivity / Impedance Phono MM : 2.5mV/50k Ω
Phono MC : 0.1mV/100 Ω
CD, Tuner, Line1, 2, 3 (XLR) : 150mV/47k Ω
DAT/Tape1, Tape2, 3 : 150mV/47k Ω
Signal Processor : 150mV/47k Ω
Signal-to-noise ratio
(IHF-A correction, direct on)
Phono MM : 86 dB or more (5 mV input)
Phono MC : 74 dB or more (250 μ V input)
CD, Tuner, Line1, 2 : 108 dB or more (input short)
Frequency response (direct on)
Phono MM : 20 Hz to 20 kHz ± 0.3 dB
Phono MC : 20 Hz to 20 kHz ± 0.3 dB
CD, Tuner, Line1, 2 : 10 Hz to 100 kHz - within 1 dB
Tone compensator Maximum variation : ± 4.5 dB
Attachment Muting Inti
Operating indicator
Direct switch
Signal processor switch
Recording Selector
Monitor switch
Tone compensator
Line fuse sensor
Pwer 100 VAC, 50Hz/60Hz
Power consumption 270W (Electrical Appliance and Material Control Law)
AC outlet Switched : 2, up to 200W
Unswitched : 1 line, up to 300W
External dimensions Width 438x Height 176x Depth 467 mm
Weight 30kg