Nakamichi IA-1

Commentary

Based on Nakamichi's technology, this integrated amplifier seeks sound and taste comparable to high-grade separate amplifiers.

The preamp section and power amplifier section use a harmonic time alignment amplifier, a circuit technology unique to Nakamichi.
This circuit is a technology that focuses on the time lag between the music signal and the distortion component brought about by the extensive use of NFB. It combines techniques that strictly adjust the phase relationship between the music signal and the distortion component over the entire audio band, such as maintaining a constant amount of NFB through the audio band by a wide-band, low-gain, open-loop design, and minimizing the amount of NFB itself.
By using this circuit, the music signal and harmonic distortion components are time-adjusted correctly, and by masking effect, distortion free sound is realized.

By providing a high current supply capability of peak current 28A, it is compatible with large low-impedance speakers.

In addition to connecting the signal path at the shortest distance, the line amplifier and power amplifier are all discrete components, and carefully selected high-quality devices are used to improve sound quality.

Equipped with four motor-driven volume and rotary selector, it can be operated from a remote location with wireless remote control.

A large power transformer is used for the power supply.
In addition, interference between circuits is eliminated by adopting a multi-regulated power supply system to prevent power interference between sections and stages, and by adopting an isolated ground system to prevent noise from entering the signal line around the ground.

Equipped with a CD direct input that jumps to a selector and balance volume and passes through a dedicated volume.

Equipped with a high-gain equalizer amplifier.

Equipped with a leave-out selector.

Equipped with a tone control with defeat.

Equipped with audio mute function.

Equipped with high-speed protection circuit.

Gold plated terminals are used for phono terminal and CD direct terminal.

The included wireless remote control allows remote control of the system.

Model Rating

Type	Integrated amplifier
Power Amplifier Unit
Rated output	80W + 80W (8 Ω, double-channel drive, 20 hz to 20 khz, THD0.01%)
Power bandwidth	10 Hz to 50 kHz
Frequency characteristic	5 Hz ~ 80 kHz + 0 -3dB
Signal-to-noise ratio	105 dB (IHF A-WTD, input short)
Total harmonic distortion factor	0.1% or Less (8 Ω, Rated Output, 20 Hz to 20 kHz)
Headphone out	187 mW (40 Ω load)
Maximum output current	28A peak (per one channel)
Preamplifier Section
Input Sensitivity / Impedance	Phono MC : 0.125mV/100 Ω Phono MM : 2.5mV/47k Ω CD, Tuner, Tape, Aux : 150mV/20k Ω
Phono maximum input level (1 kHz)	Phono MC:9mV Phono MM:180mV
Output Level / Impedance	Rec out : 150mV/1.5k Ω
Total harmonic distortion factor (at 1 kHz, Rec out, 1 V output)	Phono MC : not more than 0.01% Phono MM : not more than 0.008%
RIAA deviation	MC/MM : 30 Hz to 20 kHz ± 0.5 dB
S / N ratio (IHF A-WTD, speaker output)	Phono MC:70dB Phono MM:82dB
Tone control	Bass : ± 10 dB (20 Hz) Treble : ± 10 dB (20 kHz)
<General>
Power outlet	Switched : 2, up to 200W
Pwer	100 VAC, 50Hz/60Hz
Power consumption	Up to 600W
External dimensions	Width 430x Height 125x Depth 360 mm
Weight	Approx. 15.0 kg
Attachment	Wireless Remote Control