ONKYO Integra A-815

Commentary

Cost-performance machine that adopts W / Super Servo system, dual direct amplifier system, etc.

The W / Super Servo system is adopted in which all components caused by the inside of the amplifier are canceled by the feedback loop of the servo operational amplifier separately provided.
As a result, harmful components such as ultra-low frequency components below 1 to 2 Hz and noise electromotive force due to impedance caused by power supply capacitors, ground patterns, wiring, etc. are canceled, and the purity of the input music signal is increased.

The A-815 uses a linear switching method for amplification.
Although the basic operating characteristics of this system are high efficiency class B, the amplification part of the two transistors is made smooth, and harmful crossover distortion hardly occurs. Thus, the system has operating characteristics equivalent to class A.

Compatible with MC cartridges. In addition to the head amplifier and step-up transformer, it is equipped with a straight equalizer amplifier designed mainly for MC.
In addition, the tone circuit and buffer amplifier are omitted, and a 2-amplifier configuration is used for direct input to a high-gain power amplifier, giving priority to sound quality.

It is equipped with accessory circuits such as a 5-stage mode selector, a subsonic filter that cuts low frequencies below 15 kHz, a high-cut filter connected directly to the Treble control, a loudness switch, and a 2-channel speaker selector switch.

It uses a direct tone system composed only of passive elements.

In order to avoid high-order harmonic distortion, we use non-ferrous metals instead of magnetic materials such as iron for mechanical parts.

Model Rating

Type	W super servo type pre-main amplifier
Rated Output (20 Hz ~ 20 kHz)	50W + 50W (8 Ω, AUX → SP out, both channels driven)
Total harmonic distortion rate (20 Hz to 20 kHz)	0.02% (AUX → SP out, rated) 0.009% (AUX → SP out, 1/2 rated) 0.005% (PH ・ MM → Rec out, 3 v) 0.02% (PH ・ MC → Rec out, 3 v)
Cross modulation distortion factor	0.008% (AUX → SP out)
Powerbandwidth	5 Hz to 100 kHz (IHF-3dB, THD0.2%)
Damping factor	100 (1 kHz, 8 Ω)
Frequency characteristic	20 Hz to 20 kHz ± 0.2 dB (PH → Rec out, RIAA deviation) 2 Hz ~ 100 kHz + 0 dB -2dB (AUX → SP out, RIAA deviation)
Input Sensitivity / Impedance	Phono MM : 2.9mV/47k Ω Phono MC : 350 μ V/330 Ω Tuner, AUX, Tape Play1, 2 : 150mV/47k Ω
Phono maximum allowable input (1kHz/10kHz 0.05%)	Phono MM:230mV/1100mV Phono MC:30mV/145mV
Output Voltage / Impedance	Tape Rec1, 2 : 150mV/2.2k Ω
S/N ratio (IHF A, input short)	Phono MM:83dB Phono MC:67dB Tuner, AUX, Tape Play1, 2 : 100 dB
Tone Control (Vol-16dB)	Bass (70 Hz) : ± 8 dB Treble (20 kHz) : ± 8 dB
Loudness	+ 6 dB, 100 Hz
Subsonic filter	15 Hz, 6dB/oct.
Muting	-20dB
Pwer	100 V, 50/60Hz
Power consumption (Electrical Appliance and Material Control Law standard)	95W
AC outlet	Unswitched-1 (200W) Switched : 2 (total 200W)
External dimensions	Width 435x Height 125x Depth 385 mm
Weight	10.0kg