Accuphase E-530
¥ 500,000 (released in February 2002)
Commentary
This integrated amplifier has been developed as the highest level by combining the design technology cultivated up to now with the latest circuit and high-grade materials.
The output amplifier stage employs a power MOS FET with negative thermal characteristics. The pure class A operation with 3 pairs of parallel push-pull drive per channel guarantees stable linear power up to ultra-low impedance loads. The parallel connection can reduce output impedance and internal noise, and can disperse heat generated from the device. In addition, the low linear power region of the MOS FET with excellent linearity can be used efficiently to improve performance and sound quality.
Both the preamp and power amplifier sections use a current feedback amplifier circuit that feeds back in the form of current and has excellent high-frequency phase characteristics and sound quality.
Since the impedance of the feedback input part is very low in this circuit, phase rotation hardly occurs, and as a result, there is almost no need for phase guarantee. Therefore, various characteristics can be greatly improved with a small amount of NFB, and natural energy response can be obtained even in sound quality with excellent dynamic characteristics such as rise.
The line amplifier section consists of discrete parts using a current feedback amplifier circuit.
The circuit configuration is pure complimentary service push-pull, and the input elements are parallel to reduce noise.
A logic relay control method is adopted to configure the shortest and straight signal path.
The relay used in this system is a closed-type relay for the communication industry. By using a gold-plated cross-bar twin system for contacts, low contact resistance and post-durability are realized.
An additive active filter method is used for tone control.
In this method, the original flat signal passes straight through, and the sound quality is adjusted by adding or subtracting the characteristics from the flat signal as needed.
The power supply section is equipped with an approximately 450 VA toroidal power transformer fixed to a high-efficiency, non-resonant aluminum case and two 40,000 μ F aluminum electrolytic capacitors for filters.
Equipped with an analog peak power meter.
An insulator made of high carbon cast iron is used.
It has a built-in headphone amplifier circuit to emphasize sound quality.
Equipped with an Ext Pre button and a preamplifier output / power amplifier input terminal for independent use of the pre-section and power section.
It is equipped with a compensator function that increases the bass range when the volume is low.
Comes with a remote commander capable of volume adjustment and input switching.
Two optional board slots allow for additional digital input boards and analog disk input boards.
Model Rating
Type | Integrated stereo amplifier | ||||||||||||||||||
Rated continuous average power (both channel operation, 20 Hz to 20 kHz) |
150W/ch (1 Ω, music signal only) 120W/ch (2 Ω) 60W/ch (4 Ω) 40W/ch (6 Ω) 30W/ch (8 Ω) |
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Total harmonic distortion factor (both channel operation, 20 Hz to 20 kHz) |
0.05% (2 Ω) 0.02% (4 Ω ~ 16 Ω) |
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IM distortion factor | 0.01% | ||||||||||||||||||
Frequency characteristic | High Level input/Main input: 20 Hz ~ 20 kHz + 0 -0.2 dB (at rated continuous average output) 2 Hz ~ 150 kHz + 0 -3.0 dB at 1W Output |
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Damping factor | 120 (8 Ω load, 50 Hz) | ||||||||||||||||||
Input Sensitivity / Impedance (Rated Output / EIA1W Output) |
High Level input : 61.7mV/11.3mV/20k Ω Balanced input : 61.7mV/11.3mV/40k Ω Main input : 0.617V/113mV/20k Ω |
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Output Voltage / Impedance | Pre output : 0.617V/50 Ω (at rated continuous output) | ||||||||||||||||||
Gain | High Level input → Pre output : 20 dB Main input → output : 28 db |
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S/N, input conversion noise |
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Tone control | Bass (300 Hz) + / - 10 dB (50 Hz) High tone (3 kHz) : ± 10 dB (20 kHz) |
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Loudness compensator | + 6 dB (100 Hz, Volume -30dB) | ||||||||||||||||||
Attenuator | -20dB | ||||||||||||||||||
Power meter | Logarithmic compression type peak level display Direct reading of output at dB scale and 8 Ω load |
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Load impedance | 2 Ω ~ 16 Ω | ||||||||||||||||||
Headphone port | Applicable Impedance : 8 Ω ~ 100 Ω | ||||||||||||||||||
Pwer | 100 VAC, 50Hz/60Hz | ||||||||||||||||||
Power consumption | 180W (no input) 280W (Electrical Appliance and Material Control Law) 250W (at 8 Ω load rated output) |
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Maximum external dimensions | Width 475x Height 196x Depth 422 mm | ||||||||||||||||||
Weight | 25.0kg | ||||||||||||||||||
Attachment | Remote Commander RC-29 AC power cord |
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Optional Board Sold Separately | |||||||||||||||||||
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