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Nakamichi SR-4 Stasis Receiver
$495
PRICE FIXED.
The Nakamichi SR-4 redefines the word "receiver". It offers the same convenience and economy but it's designed like separate audiophile components - each individually optimized, each individually powered, each isolated for minimum interference. And what a receiver: STASIS power amplification for uniform impedance, inherent stability and tremendous peak-current capability, a moving-coil/moving-magnet phono preamp with precise equalization, an effective subsonic filter and more. Like continuously variable loudness and tone controls, independent recording and input selectors with two-way dubbing and two video inputs, a 10-preset PLL Quartz-Lock FM/AM tuner with manual and auto-seek tuning, and wireless remote control.
The SR-4 performance is due in part to its unique power supply. Unlike ordinary receivers, the SR-4A transfrmer has separate windings, rectifiers and regulators for each major section; power amplifier, preamplifier, tuner and display. Within the audio circuitry, separate regulators are used for the phono preamp and high-level stages, and the video amplifiers are regulated independently of the audio stages to prevent video noise from intruding. Separate grounds are used for audio, tuner, display and power supply so ripple and RF noise will not enter the audio circuitry. The tuner is even buffered from the other inputs to prevent interference. Critical subregulators are discretely configured with a unique topology that cancels noise on the ground line. This unusually exotic power supply permits each section to operate independently of the others - the major advantage of "separate" components.
Stasis Amplification
Audiophiles who hear the SR-4 are amazed at its effortlessly transparent sound. Music has more detail, more impact, more realism - especially when reproduced on "difficult" top-quality speakers. The reason is our "Stasis" power amplifier - the same concept used in the PA-7 and PA-5 Power Amplifiers.
STASIS is a radically different and superior design in which two amplifiers drive the speaker; a high-quality low-power amplifier and a "Current-Mirror Bootstrap" to supply muscle. The low-power amplifier can be designed for virtually perfect performance, "global" feedback isn't needed as in ordinary power amps. Removing the overall feedback ensures uniform output impedance and inherent stability, and, since the amplifier is stable, there's no need to isolate it from the speaker with a coil as is usually done. This permits the amplifier to control the speaker more preciselly and realize its full potential. The current bootstrap provides tremendous peak-current reserves - up to 25 ampers into low-impedance loads
Specifications
Tuning range: FM, MW
Power output: 60 watts per channel into 8Ω (stereo)
Frequency response: 20Hz to 20kHz
Total harmonic distortion: 0.1%
Input sensitivity: 0.16mV (MC), 2.5mV (MM), 200mV (line)
Signal to noise ratio: 73dB (MC), 80dB (MM), 105dB (line)
Output: 200mV (line)
Speaker load impedance: 4Ω (minimum)
Dimensions: 430 x 100 x 370mm
Weight: 9.8kg
Accessories: remote control.
The Nakamichi SR-4 redefines the word "receiver". It offers the same convenience and economy but it's designed like separate audiophile components - each individually optimized, each individually powered, each isolated for minimum interference. And what a receiver: STASIS power amplification for uniform impedance, inherent stability and tremendous peak-current capability, a moving-coil/moving-magnet phono preamp with precise equalization, an effective subsonic filter and more. Like continuously variable loudness and tone controls, independent recording and input selectors with two-way dubbing and two video inputs, a 10-preset PLL Quartz-Lock FM/AM tuner with manual and auto-seek tuning, and wireless remote control.
The SR-4 performance is due in part to its unique power supply. Unlike ordinary receivers, the SR-4A transfrmer has separate windings, rectifiers and regulators for each major section; power amplifier, preamplifier, tuner and display. Within the audio circuitry, separate regulators are used for the phono preamp and high-level stages, and the video amplifiers are regulated independently of the audio stages to prevent video noise from intruding. Separate grounds are used for audio, tuner, display and power supply so ripple and RF noise will not enter the audio circuitry. The tuner is even buffered from the other inputs to prevent interference. Critical subregulators are discretely configured with a unique topology that cancels noise on the ground line. This unusually exotic power supply permits each section to operate independently of the others - the major advantage of "separate" components.
Stasis Amplification
Audiophiles who hear the SR-4 are amazed at its effortlessly transparent sound. Music has more detail, more impact, more realism - especially when reproduced on "difficult" top-quality speakers. The reason is our "Stasis" power amplifier - the same concept used in the PA-7 and PA-5 Power Amplifiers.
STASIS is a radically different and superior design in which two amplifiers drive the speaker; a high-quality low-power amplifier and a "Current-Mirror Bootstrap" to supply muscle. The low-power amplifier can be designed for virtually perfect performance, "global" feedback isn't needed as in ordinary power amps. Removing the overall feedback ensures uniform output impedance and inherent stability, and, since the amplifier is stable, there's no need to isolate it from the speaker with a coil as is usually done. This permits the amplifier to control the speaker more preciselly and realize its full potential. The current bootstrap provides tremendous peak-current reserves - up to 25 ampers into low-impedance loads
Specifications
Tuning range: FM, MW
Power output: 60 watts per channel into 8Ω (stereo)
Frequency response: 20Hz to 20kHz
Total harmonic distortion: 0.1%
Input sensitivity: 0.16mV (MC), 2.5mV (MM), 200mV (line)
Signal to noise ratio: 73dB (MC), 80dB (MM), 105dB (line)
Output: 200mV (line)
Speaker load impedance: 4Ω (minimum)
Dimensions: 430 x 100 x 370mm
Weight: 9.8kg
Accessories: remote control.
- Date Listed:24/10/2023
- Last Edited:24/10/2023
- Condition:Used
- Shipping:Pickup Only
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